Bourns® Multifuse®
Resettable Fuses
- Polymer PTC & Ceramic PTC
Short Form Catalog
Bourns® Multifuse® Products
Bourns® Multifuse® family of Polymer
Positive Temperature Coefficient (PPTC)
“resettable fuses” are used in a wide variety of
circuit protection applications.
Under fault conditions the device resistance
will rise exponentially and remain in a
“tripped” state, providing continuous circuit
protection until the fault is removed. Once the
fault is removed and the power cycled, the
device will return to its normal low resistance
state.
What’s New in this Edition
• MF-PSMF Series 0805 surface mount
products
• MF-RHT Series high temperature radial
through-hole products
• MF-SM013/250V telecom vertical surface
mount products
• Expanded MF-NSMF Series 1206 surface
mount products
• MF-RG Series automotive radial through-
hole products
• MF-RX/72 Series 72V radial through-hole
products
• CMF Series ceramic products
See Also
• Multifuse® automotive short form catalog
• Circuit protection selection guide for
dedicated Multifuse® telecom products
Features/Benefits
• Resettable overcurrent protection
• Heat element
• Agency approvals - UL, CSA, TÜV
• Standard footprints and packaging options
• Low resistance
• RoHS compliance standard
• Custom designs available
Applications
• Computer
• Battery
• Automotive
• Telecommunications
• Industrial
• Consumer
2
3
Multifuse® Products – How They Are Used
I=V/RL
I=V/RMF
VS
+t°
RL
RMF
I
Temperature
Typical Circuit ApplicationPTC Response Characteristic
Log Resistance
I=V/RL
I=V/RMF
VS
+t°
RL
RMF
I
Temperature
Typical Circuit ApplicationPTC Response Characteristic
Log Resistance
HOT
Non-conducting
Carbon Chains
Multifuse® Products – How They Work
COLD
Crystalline
Polymer
Conducting
Carbon Chains
Amorphous
Polymer
Resettable fuses are manufactured in the form of a conductive plastic, which is comprised of a non-
conductive crystalline polymer with highly conductive carbon black particles impregnated throughout
the crystal lattice. Because of the close proximity of the carbon black particles within the crystal lattice,
under normal conditions current is allowed to flow easily through the conductive plastic. However
under a fault condition, when there is an increase in current, the conductive plastic heats at the rate of
I2R. As the material continues to heat, it eventually reaches the phase transformation temperature, which
changes the crystal structure into an amorphous structure. Once the material has transformed into this
amorphous structure, the conductive particles become isolated and are unable to conduct current hence
the drastic change in material resistance. It is only when the current is removed that the material is
allowed to cool and return to its original crystal structure.
It is the materials used in resettable fuses that allow
them to reset after a fault condition has been
removed. Resettable fuses exhibit a positive
temperature coefficient effect when heated. While
many materials exhibit a PTC effect when heated
(an increase in resistance in response to a positive
change in temperature), what makes the material
used in resettable fuses unique is the fact that the
increase in resistance changes exponentially rather
than in a linear manner.
It is because of this transformation from a low
resistance state to a high resistance state that allows
the resettable fuse to protect loads. It is this
transition from the low resistance state to high
resistance state that is referred to as tripping. The
time it takes for a resettable fuse to trip is relatively
quick, depending on how high the fault current is
and it can be as quick as a fraction of a second.
Hence they are an excellent form of protection for
most applications where sensitive devices need
extra protection.
4
Features
■ Bulk and Tape and Reel Packaging
■ Industry Standard Sizes
Applications
■ Computers and Peripherals
■ General Electronics
■ Automotive
■ Consumer Appliances
■ Electronic Toys
Radial Leaded Low Voltage Products
A
B B
C
Style 1
Style 2 Style 3Style 1
A
B
C
Style 2
A
C
Style 3 Style 4
A
B
C
A
B
C
Style 5
A
B
C
Top and Bottom View Side View Top and Bottom View Side ViewSide View End View
A
B
C
A
C
B
MF-R Series 16-60 Volts
Radial Leaded 0.05-11 Amps Hold Current
Initial 1 Hour (R1)
Resistance Post-Trip Dimensions
Ihold Resistance mm/(in)
Model Amperes V max. I max. Ohms at 23 °C Style
at 23 °C Volts Amps Min. Max. A Max. B Max. C Nom.
MF-R005 0.05 60 40 7.3 22.0 8.0 8.3 5.1 4
(0.315) (0.327) (0.201)
MF-R010 0.10 60 40 2.50 7.50 7.4 12.7 5.1 1
(0.291) (0.500) (0.201)
MF-R017 0.17 60 40 2.00 8.00 7.4 12.7 5.1 1
(0.291) (0.500) (0.201)
MF-R020 0.20 60 40 1.50 4.40 7.4 12.7 5.1 1
(0.291) (0.500) (0.201)
MF-R025 0.25 60 40 1.00 3.00 7.4 12.7 5.1 1
(0.291) (0.500) (0.201)
MF-R030 0.30 60 40 0.76 2.10 7.4 13.4 5.1 1
(0.291) (0.528) (0.201)
MF-R040 0.40 60 40 0.52 1.29 7.4 13.7 5.1 1
(0.291) (0.539) (0.201)
MF-R050 0.50 60 40 0.41 1.17 7.9 13.7 5.1 1
(0.311) (0.539) (0.201)
MF-R065 0.65 60 40 0.27 0.72 9.7 15.2 5.1 1
(0.382) (0.598) (0.201)
MF-R075 0.75 60 40 0.18 0.60 10.4 16.0 5.1 1
(0.409) (0.630) (0.201)
MF-R090 0.90 60 40 0.14 0.47 11.7 16.7 5.1 1
(0.461) (0.657) (0.201)
MF-R090-0-9 0.90 30 40 0.07 0.22 7.4 12.2 5.1 3
(0.291) (0.480) (0.201)
MF-R110 1.10 30 40 0.10 0.27 8.9 14.0 5.1 1
(0.350) (0.551) (0.201)
MF-R135 1.35 30 40 0.065 0.17 8.9 18.9 5.1 1
(0.350) (0.744) (0.201)
MF-R160 1.60 30 40 0.055 0.15 10.2 16.8 5.1 1
(0.402) (0.661) (0.201)
MF-R185 1.85 30 40 0.040 0.11 12.0 18.4 5.1 1
(0.472) (0.724) (0.201)
MF-R250 2.50 30 40 0.025 0.07 12.0 18.3 5.1 2
(0.472) (0.720) (0.201)
MF-R250-0-10 2.50 30 40 0.025 0.07 12.0 18.3 5.1 3
(0.472) (0.720) (0.201)
MF-R300 3.00 30 40 0.020 0.08 12.0 18.3 5.1 2
(0.472) (0.720) (0.201)
MF-R400 4.00 30 40 0.010 0.05 14.4 24.8 5.1 2
(0.567) (0.976) (0.201)
MF-R500 5.00 30 40 0.010 0.05 17.4 24.9 10.2 2
(0.685) (0.980) (0.402)
MF-R600 6.00 30 40 0.005 0.04 19.3 31.9 10.2 2
(0.760) (1.256) (0.402)
MF-R700 7.00 30 40 0.005 0.03 22.1 29.8 10.2 2
(0.870) (1.173) (0.402)
MF-R800 8.00 30 40 0.005 0.03 24.2 32.9 10.2 2
(0.953) (1.295) (0.402)
MF-R900 9.00 30 40 0.005 0.02 24.2 32.9 10.2 2
(0.953) (1.295) (0.402)
MF-R1100 11.00 16 100 0.003 0.014 24.2 32.9 10.2 2
(0.953) (1.295) (0.402)
Initial 1 Hour (R1)
Resistance Post-Trip Dimensions
Ihold Resistance mm/(in)
Model Amperes V max. I max. Ohms at 23 °C Style
at 23 °C Volts Amps Min. Max. A Max. B Max. C Nom.
MF-RHT070 0.7 16 40 0.3 0.8 6.86 10.8 5.1 3
(0.27) (0.425) (0.201)
MF-RHT200 2.0 16 100 0.045 0.110 9.4 14.0 5.1 1
(0.37) (0.55) (0.201)
MF-RHT450 4.5 16 100 0.022 0.054 10.4 15.6 5.1 2
(0.41) (0.61) (0.201)
MF-RHT650 6.5 16 100 0.011 0.026 12.7 22.2 5.1 2
(0.5) (0.88) (0.201)
MF-RHT750 7.5 16 100 0.0094 0.022 14.0 23.5 5.1 2
(0.55) (0.93) (0.201)
MF-RHT1300 13.0 16 100 0.0041 0.01 23.5 28.7 10.2 2
(0.925) (1.17) (0.402)
MF-RHT Series Operating Temperature
Radial Leaded High Temperature -40
°C ~ +125
°C
MF-RX Series* 60 Volts
Radial Leaded 1.10 - 3.75 Amps Hold Current
Model
Ihold
Amperes
at 23 °C
V max.
Volts
I max.
Amps
Initial
Resistance
1 Hour (R1)
Post-Trip
Resistance Dimensions
mm/(in) Style
Ohms at 23 °C
Min. Max. A Max. B Max. C Nom.
MF-RX110 1.10 60 40 0.15 0.38 13.0
(0.512) 18.0
(0.709) 5.1
(0.201) 5
MF-RX135 1.35 60 40 0.12 0.30 14.5
(0.571) 19.6
(0.772) 5.1
(0.201) 5
MF-RX160 1.60 60 40 0.09 0.22 16.3
(0.642) 21.3
(0.839) 5.1
(0.201) 5
MF-RX185 1.85 60 40 0.08 0.19 17.8
(0.701) 22.9
(0.902) 5.1
(0.201) 5
MF-RX250 2.50 60 40 0.05 0.13 21.3
(0.839) 26.4
(1.039) 10.2
(0.402) 5
MF-RX300 3.00 60 40 0.04 0.10 24.9
(0.980) 30.0
(1.181) 10.2
(0.402) 5
MF-RX375 3.75 60 40 0.03 0.08 28.4
(1.118) 33.5
(1.319) 10.2
(0.402) 5
*Not recommended for new designs, suggest using new MF-RX/72 Series
MF-RX/72 Series 72 Volts
Radial Leaded 0.20 – 3.75 Amps Hold Current
Model
Ihold
Amperes
at 23 °C
V max.
Volts
I max.
Amps
Initial
Resistance
1 Hour (R1)
Post-Trip
Resistance Dimensions
mm/(in) Style
Ohms at 23 °C
Min. Max. A Max. B Max. C Nom.
MF-RX020/72 0.20 72 40 1.50 4.40 7.4
(0.291) 12.7
(0.500) 5.1
(0.201) 1
MF-RX025/72 0.25 72 40 1.00 3.00 7.4
(0.291) 12.7
(0.500) 5.1
(0.201) 1
MF-RX030/72 0.30 72 40 0.76 2.10 7.4
(0.291) 13.4
(0.528) 5.1
(0.201) 1
MF-RX040/72 0.40 72 40 0.52 1.29 7.4
(0.291) 13.7
(0.539) 5.1
(0.201) 1
MF-RX050/72 0.50 72 40 0.41 1.17 7.9
(0.311) 13.7
(0.539) 5.1
(0.201) 1
MF-RX065/72 0.65 72 40 0.27 0.72 9.7
(0.382) 15.2
(0.598) 5.1
(0.201) 1
MF-RX075/72 0.75 72 40 0.18 0.60 10.4
(0.409) 16.0
(0.630) 5.1
(0.201) 1
MF-RX090/72 0.90 72 40 0.14 0.47 11.7
(0.461) 16.7
(0.657) 5.1
(0.201) 1
MF-RX110/72 1.10 72 40 0.15 0.38 10.84
(0.427) 16.84
(0.662) 5.1
(0.201) 2
MF-RX135/72 1.35 72 40 0.12 0.30 12.26
(0.483) 18.26
(0.718) 5.1
(0.201) 2
MF-RX160/72 1.60 72 40 0.09 0.22 13.94
(0.549) 19.94
(0.785) 5.1
(0.201) 2
MF-RX185/72 1.85 72 40 0.08 0.19 15.18
(0.598) 21.18
(0.833) 5.1
(0.201) 2
MF-RX250/72 2.50 72 40 0.05 0.13 17.84
(0.702) 23.84
(0.938) 10.2
(0.402) 2
MF-RX300/72 3.00 72 40 0.04 0.10 20.67
(0.814) 26.67
(1.050) 10.2
(0.402) 2
MF-RX375/72 3.75 72 40 0.03 0.08 23.51
(0.926) 29.51
(1.161) 10.2
(0.402) 2
MF-RG Series
Radial Leaded 16 V
Operating Temperature
-40
°C ~ +85
°C
Model
Ihold
Amperes
at 23 °C
V max.
Volts
I max.
Amps
Initial
Resistance
1 Hour (R1)
Post-Trip
Resistance Dimensions
mm/(in) Style
Ohms at 23 °C
Min. Max. A Max. B Max. C Max.
MF- RG300 3.0 16 100 0.038 0.0975 7.1
(0.28) 11.0
(0.43) 5.1 ±0.7
(0.201 ±0.028) 2
MF- RG500 5.0 16 100 0.015 0.0340 10.4
(0.41) 14.3
(0.56) 5.1 ±0.7
(0.201 ±0.028) 2
5
Features
■ Tape and Reel Packaging
■ Industry Standard Sizes
Applications
■ Computers and Peripherals
■ General Electronics
■ Automotive
Style 1
Side View End View
Style 2 Style 3
Top and Bottom View Side View
A
B
C
A
C
B
A
BC
Surface Mount Low Voltage Products
MF-MSMF Series (1812 package) 6-60 Volts
Surface Mount (4532 mm) 0.10-2.60 Amps Hold Current
Initial 1 Hour (R1)
Resistance Post-Trip Dimensions
Ihold Resistance mm/(in) Style
Model Amperes V max. I max. Ohms at 23 °C
at 23 °C Volts Amps Min. Max. A Max. B Max. C Max.
MF-MSMF010 0.10 60 40 0.70 15.0 4.73 3.41 1.10 2
(0.186) (0.134) (0.043)
MF-MSMF014 0.14 60 40 0.40 6.50 4.73 3.41 1.10 2
(0.186) (0.134) (0.043)
MF-MSMF020 0.20 30 80 0.40 6.00 4.73 3.41 1.10 2
(0.186) (0.134) (0.043)
MF-MSMF020/60 0.20 60 40 0.40 6.00 4.73 3.41 1.10 2
(0.186) (0.134) (0.043)
MF-MSMF030 0.30 30 10 0.30 3.00 4.73 3.41 1.10 2
(0.186) (0.134) (0.043)
MF-MSMF050 0.50 15 100 0.15 1.00 4.73 3.41 0.85 2
(0.186) (0.134) (0.033)
MF-MSMF075 0.75 13.2 100 0.11 0.45 4.73 3.41 0.85 2
(0.186) (0.134) (0.033)
MF-MSMF075/24 0.75 24 40 0.11 0.45 4.73 3.41 0.85 2
(0.186) (0.134) (0.033)
MF-MSMF110 1.10 6 100 0.04 0.21 4.73 3.41 0.85 2
(0.186) (0.134) (0.033)
MF-MSMF110/16 1.10 16 100 0.04 0.21 4.73 3.41 0.85 2
(0.186) (0.134) (0.033)
MF-MSMF125 1.25 6 100 0.035 0.14 4.73 3.41 0.85 2
(0.186) (0.134) (0.033)
MF-MSMF150 1.50 6 100 0.03 0.12 4.73 3.41 0.85 2
(0.186) (0.134) (0.033)
MF-MSMF150/12 1.50 12 100 0.03 0.12 4.73 3.41 0.85 2
(0.186) (0.134) (0.033)
MF-MSMF160 1.60 8 100 0.035 0.099 4.73 3.41 0.85 2
(0.186) (0.134) (0.033)
MF-MSMF200 2.00 8 40 0.020 0.08 4.73 3.41 0.85 2
(0.186) (0.134) (0.033)
MF-MSMF250/16 2.50 16 100 0.015 0.1 4.73 3.41 2.00 2
(0.186) (0.134) (0.078)
MF-MSMF260 2.60 6 100 0.015 0.08 4.73 3.41 0.85 2
(0.186) (0.134) (0.033)
MF-SM Series (3425 package) 15-33 Volts
Surface Mount (8763 mm) 1.50-2.50 Amps Hold Current
Initial 1 Hour (R1)
Resistance Post-Trip Dimensions
Ihold Resistance mm/(in)
Model Amperes V max. I max. Ohms at 23 °C Style
at 23 °C Volts Amps Min. Max. A Max. B Max. C Nom.
MF-SM150 1.50 15 100 0.06 0.25 9.50 3.0 6.71 1
(0.374) (0.118) (0.264)
MF-SM150/33 1.50 33 40 0.06 0.23 9.50 3.0 6.71 1
(0.374) (0.118) (0.264)
MF-SM185/33 1.80 33 40 0.04 0.15 9.50 3.0 6.71 1
(0.374) (0.118) (0.264)
MF-SM200 2.00 15 100 0.045 0.125 9.50 3.0 6.71 1
(0.374) (0.118) (0.264)
MF-SM250 2.50 15 100 0.024 0.085 9.50 3.0 6.71 1
(0.374) (0.118) (0.264)
MF-NSMF Series (1206 package) 6 - 30 Volts
Surface Mount (3216 mm) 0.12 - 2.00 Amps Hold Current
Model
Ihold
Amperes
at 23 °C
V max.
Volts
I max.
Amps
Initial
Resistance
1 Hour (R1)
Post-Trip
Resistance Dimensions
mm/(in) Style
Ohms at 23 °C
Min. Max. A Max. B Max. C Max.
MF-NSMF012 0.12 30 10 1.35 8.50 3.4
(0.134) 1.8
(0.071) 1.1
(0.043) 2
MF-NSMF020 0.20 24 10 0.60 2.60 3.4
(0.134) 1.8
(0.071) 0.85
(0.033) 2
MF-NSMF035 0.35 6 100 0.30 1.20 3.4
(0.134) 1.8
(0.071) 0.85
(0.033) 2
MF-NSMF050 0.50 13.2 100 0.15 0.70 3.4
(0.134) 1.8
(0.071) 0.85
(0.033) 2
MF-NSMF075 0.75 6 100 0.10 0.40 3.4
(0.134) 1.8
(0.071) 0.7
(0.028) 2
MF-NSMF110 1.10 6 100 0.06 0.20 3.4
(0.134) 1.8
(0.071) 0.7
(0.028) 2
MF-NSMF150 1.50 6 100 0.03 0.13 3.4
(0.134) 1.8
(0.071) 0.7
(0.028) 2
MF-NSMF200 2.00 6 100 0.02 0.085 3.5
(0.138) 1.8
(0.071) 1.6
(0.063) 2
MF-SM Series (2920 package) 6-60 Volts
Surface Mount (7555 mm) 0.30-3.00 Amps Hold Current
Initial 1 Hour (R1)
Resistance Post-Trip Dimensions
Ihold Resistance mm/(in)
Model Amperes V max. I max. Ohms at 23 °C Style
at 23 °C Volts Amps Min. Max. A Max. B Max. C Nom.
MF-SM030 0.30 60 40 0.90 4.80 7.98 3.18 5.44 1
(0.314) (0.125) (0.214)
MF-SM050 0.50 60 40 0.35 1.40 7.98 3.18 5.44 1
(0.314) (0.125) (0.214)
MF-SM075 0.75 30 80 0.23 1.00 7.98 3.18 5.44 1
(0.314) (0.125) (0.214)
MF-SM075/60 0.75 60 10 0.23 1.00 7.98 3.18 5.44 1
(0.314) (0.125) (0.214)
MF-SM100 1.10 30 80 0.12 0.48 7.98 3.0 5.44 1
(0.314) (0.118) (0.214)
MF-SM100/33 1.10 33 40 0.12 0.41 7.98 3.0 5.44 1
(0.314) (0.118) (0.214)
MF-SM125 1.25 15 100 0.07 0.25 7.98 3.0 5.44 1
(0.314) (0.118) (0.214)
MF-SM260 2.60 6 100 0.025 0.075 7.98 3.0 5.44 1
(0.314) (0.118) (0.214)
MF-SM300 3.00 6 100 0.015 0.048 7.98 3.0 5.44 1
(0.314) (0.118) (0.214)
6
MF-USMF Series (1210 package) 6 - 30 Volts
Surface Mount (3225 mm) 0.05 - 1.75 Amps Hold Current
Model
Ihold
Amperes
at 23 °C
V max.
Volts
I max.
Amps
Initial
Resistance
1 Hour (R1)
Post-Trip
Resistance Dimensions
mm/(in) Style
Ohms at 23 °C
Min. Max. A Max. B Max. C Max.
MF-USMF005 0.05 30 10 2.80 50.0 3.43
(0.135) 2.8
(0.11) 1.1
(0.043) 2
MF-USMF010 0.10 30 10 0.80 15.0 3.43
(0.135) 2.8
(0.11) 1.1
(0.043) 2
MF-USMF020 0.20 30 10 0.40 5.00 3.43
(0.135) 2.8
(0.11) 1.1
(0.043) 2
MF-USMF035 0.35 6.0 40 0.20 1.30 3.43
(0.135) 2.8
(0.11) 0.85
(0.033) 2
MF-USMF050 0.50 13.2 40 0.18 0.90 3.43
(0.135) 2.8
(0.11) 0.85
(0.033) 2
MF-USMF075 0.75 6.0 40 0.07 0.45 3.43
(0.135) 2.8
(0.11) 0.85
(0.033) 2
MF-USMF110 1.10 6.0 40 0.05 0.21 3.43
(0.135) 2.8
(0.11) 0.85
(0.033) 2
MF-USMF150 1.50 6.0 40 0.03 0.11 3.43
(0.135) 2.8
(0.11) 0.85
(0.033) 2
MF-USMF175 1.75 6.0 40 0.02 0.09 3.43
(0.135) 2.8
(0.11) 0.85
(0.033) 2
Initial 1 Hour (R1)
Resistance Post-Trip Dimensions
Ihold Resistance mm/(in)
Model Amperes V max. I max. Ohms at 23 °C Style
at 23 °C Volts Amps Min. Max. A Max. B Max. C Max.
MF-SMHT136 1.36 16 100 0.085 0.330 7.98 3.0 5.44 1
(0.314) (0.118) (0.214)
MF-SMHT160 1.60 16 100 0.050 0.150 9.5 3.0 6.71 1
(0.374) (0.118) (0.264)
MF-SMHT Series 16 Volts
Surface Mount/High 1.36 - 1.60 Amps Hold Current
Temperature (Working temp: -40 ~ +125 °C)
MF-PSMF Series (0805 package) 6 - 9 Volts
Surface Mount (2010 mm) 0.20 - 1.10 Amps Hold Current
Model
Ihold
Amperes
at 23 °C
V max.
Volts
I max.
Amps
Initial
Resistance
1 Hour (R1)
Post-Trip
Resistance Dimensions
mm/(in) Style
Ohms at 23 °C
Min. Max. A Max. B Max. C Max.
MF-PSMF020X 0.20 9 40 0.65 3.5 2.3
(0.091) 1.5
(0.059) 0.85
(0.033) 2
MF-PSMF035X 0.35 6 40 0.25 1.2 2.3
(0.091) 1.5
(0.059) 0.85
(0.033) 2
MF-PSMF050X 0.50 6 40 0.15 0.9 2.3
(0.091) 1.5
(0.059) 0.85
(0.033) 2
MF-PSMF075X 0.75 6 40 0.09 0.35 2.3
(0.091) 1.5
(0.059) 1.25
(0.049) 2
MF-PSMF110X 1.10 6 40 0.06 0.21 2.3
(0.091) 1.5
(0.059) 1.25
(0.049) 2
Initial 1 Hour (R1)
Resistance Post-Trip Dimensions
Ihold Resistance mm/(in)
Model Amperes V max. I max. Ohms at 23 °C Style
at 23 °C Volts Amps Min. Max. A Max. B Max. C Max.
MF-SMDF050 0.55 60 10 0.20 1 5.44 4.93 1.09 2
(0.214) (0.194) (0.043)
MF-SMDF150 1.50 15 40 0.05 0.17 5.44 4.93 0.85 2
(0.214) (0.194) (0.033)
MF-SMDF200 2.00 10 40 0.03 0.1 5.44 4.93 0.85 2
(0.214) (0.194) (0.033)
MF-SMDF Series (2018 package) 10 - 60 Volts
Surface Mount (5050 mm) 0.30 - 2.00 Amps Hold Current
Surface Mount Low Voltage Products (Continued)
7
Features
■ Axial/Radial Leaded
■ Weldable Nickel Terminal
■ Very Low Internal Resistance
Applications
■ Rechargeable Battery Packs for
Cellular Phones & Laptop Computers
Strap Products
B
C
A
B
A
Standard Style "RU" Style
"S" Style
C
SLIT NOMINAL
0.5
(.020)
4.0
(.157)
X
B
A
C
MF-VS Narrow Body Series (Low Resistance Narrow) 12 Volts
Axial Leaded Strap 1.7-2.1 Amps Hold Current
Initial 1 Hour (R1)
Resistance Post-Trip Dimensions
Ihold Resistance mm/(in)
Model Amperes V max. I max. Ohms at 23 °C Style
at 23 °C Volts Amps Min. Max. A Max. B Max. C Max.
MF-VS170N 1.7 12 100 0.030 0.105 24.0 3.9 0.9 Std.
(0.945) (0.154) (0.035)
MF-VS175NL 1.75 12 100 0.029 0.102 28.0 3.9 0.9 Std.
(1.102) (0.154) (0.035)
MF-VS210N 2.1 12 100 0.018 0.060 32.0 3.9 0.9 Std.
(1.260) (0.154) (0.035)
MF-SVS Series (Lowest Available Resistance) 10 Volts
Axial Leaded Strap 1.7-2.3 Amps Hold Current
Initial 1 Hour (R1)
Resistance Post-Trip Dimensions
Ihold Resistance mm/(in)
Model Amperes V max. I max. Ohms at 23 °C Style
at 23 °C Volts Amps Min. Max. A Max. B Max. C Max.
MF-SVS170 1.7 10 100 0.018 0.064 18.0 5.5 0.9 Std.
(0.709) (0.216) (0.035)
MF-SVS170N 1.7 10 100 0.018 0.064 24.0 3.9 0.9 Std.
(0.945) (0.153) (0.035)
MF-SVS175 1.75 10 100 0.017 0.063 18.0 5.5 0.9 Std.
(0.709) (0.216) (0.035)
MF-SVS175N 1.75 10 100 0.017 0.063 24.0 3.9 0.9 Std.
(0.945) (0.153) (0.035)
MF-SVS175NL 1.75 10 100 0.017 0.063 28.0 3.9 0.9 Std.
(1.102) (0.153) (0.035)
MF-SVS210 2.1 10 100 0.010 0.040 23.1 5.5 0.9 Std.
(0.909) (0.216) (0.035)
MF-SVS210N 2.1 10 100 0.010 0.040 32.0 3.9 0.9 Std.
(1.260) (0.153) (0.035)
MF-SVS230 2.3 10 100 0.010 0.036 23.1 5.5 0.9 Std.
(0.909) (0.216) (0.035)
MF-SVS230N 2.3 10 100 0.010 0.036 32.0 3.9 0.9 Std.
(1.260) (0.153) (0.035)
MF-VS Series (Low Resistance & Low Temp.) 16 Volts
Axial Leaded Strap 1.7-2.4 Amps Hold Current
Initial 1 Hour (R1)
Resistance Post-Trip Dimensions
Ihold Resistance mm/(in)
Model Amperes V max. I max. Ohms at 23 °C Style
at 23 °C Volts Amps Min. Max. A Max. B Max. C Max.
MF-VS170 1.7 16 100 0.030 0.105 18.0 5.5 0.9 Std.
(0.709) (0.217) (0.035)
MF-VS170S 1.7 16 100 0.030 0.105 18.0 5.5 0.9 S
(0.709) (0.217) (0.035)
MF-VS210 2.1 16 100 0.018 0.060 23.1 5.5 0.9 Std.
(0.909) (0.217) (0.035)
MF-VS210L 2.1 16 100 0.018 0.060 26 5.5 0.9 Std.
(1.023) (0.217) (0.035)
MF-VS210S 2.1 16 100 0.018 0.060 23.1 5.5 0.9 S
(0.909) (0.217) (0.035)
MF-LR Series (Low Resistance) 10-20 Volts
Axial Leaded Strap 1.90-9.00 Amps Hold Current
Initial 1 Hour (R1)
Resistance Post-Trip Dimensions
Ihold Resistance mm/(in)
Model Amperes V max. I max. Ohms at 23 °C Style
at 23 °C Volts Amps Min. Max. A Max. B Max. C Max.
MF-LR190 1.90 15 100 0.039 0.102 22.1 5.2 1.0 Std.
(0.870) (0.205) (0.039)
MF-LR190S 1.90 15 100 0.039 0.102 22.1 5.2 1.0 S
(0.870) (0.205) (0.039)
MF-LR260 2.60 15 100 0.020 0.083 23.1 5.2 1.0 Std.
(0.909) (0.205) (0.039)
MF-LR260S 2.60 15 100 0.020 0.083 23.1 5.2 1.0 S
(0.909) (0.205) (0.039)
MF-LR380 3.80 15 100 0.013 0.037 26.0 7.5 1.0 Std.
(1.024) (0.295) (0.039)
MF-LR450 4.50 16 100 0.011 0.028 26.0 10.5 1.0 Std.
(1.024) (0.414) (0.039)
MF-LR550 5.50 10 100 0.009 0.022 37.0 7.5 1.0 Std.
(1.457) (0.295) (0.039)
MF-LR600 6.00 10 100 0.007 0.019 26.0 15.9 1.0 Std.
(1.024) (0.626) (0.039)
MF-LR730 7.30 10 100 0.006 0.015 30 15 1.0 Std.
(1.18) (0.590) (0.039)
MF-LR730/20 7.30 20 100 0.006 0.015 29.1 14.5 1.0 Std.
(1.146) (0.571) (0.039)
MF-LR900/20 9.00 20 100 0.006 0.014 47.6 8.5 1.3 Std.
(1.874) (0.335) (0.051)
8
MF-LS Series (Lower Trip Temperature) 15-24 Volts
Axial Leaded Strap 1.0-3.4 Amps Hold Current
Initial 1 Hour (R1)
Resistance Post-Trip Dimensions
Ihold Resistance mm/(in)
Model Amperes V max. I max. Ohms at 23 °C Style
at 23 °C Volts Amps Min. Max. A Max. B Max. C Max.
MF-LS100S 1.0 24 100 0.070 0.260 23.1 5.2 1.0 S
(0.909) (0.205) (0.039)
MF-LS180 1.8 24 100 0.040 0.120 26.0 5.2 1.0 Std.
(1.024) (0.205) (0.039)
MF-LS180L 1.8 24 100 0.040 0.120 37.5 5.6 1.0 Std.
(1.48) (0.22) (0.039)
MF-LS180S 1.8 24 100 0.040 0.120 26.0 5.2 1.0 S
(1.024) (0.205) (0.039)
MF-LS190 1.9 24 100 0.030 0.100 23.4 11.0 1.1 Std.
(0.921) (0.433) (0.043)
MF-LS190RU 1.9 15 100 0.030 0.100 20.8 14.3 0.76 RU
(0.819) (0.563) (0.030)
MF-LS260 2.6 24 100 0.025 0.076 26.0 11.9 1.0 Std.
(1.024) (0.469) (0.039)
MF-LS300 3.0 24 100 0.015 0.055 31.8 13.5 1.1 Std.
(1.252) (0.531) (0.043)
MF-LS340 3.4 24 100 0.016 0.050 26.0 15.9 1.0 Std.
(1.024) (0.626) (0.039)
MF-S Series (Standard) 15-30 Volts
Axial Leaded Strap 1.20-4.20 Amps Hold Current
Initial 1 Hour (R1)
Resistance Post-Trip Dimensions
Ihold Resistance mm/(in)
Model Amperes V max. I max. Ohms at 23 °C Style
at 23 °C Volts Amps Min. Max. A Max. B Max. C Max.
MF-S120 1.20 15 100 0.085 0.220 22.1 5.2 1.0 Std.
(0.870) (0.205) (0.039)
MF-S120S 1.20 15 100 0.085 0.220 22.1 5.2 1.0 S
(0.870) (0.205) (0.039)
MF-S150 1.50 15 100 0.050 0.113 23.4 11.0 1.1 Std.
(0.921) (0.433) (0.043)
MF-S175 1.75 15 100 0.050 0.120 23.1 5.2 1.0 Std.
(0.909) (0.205) (0.039)
MF-S175S 1.75 15 100 0.050 0.120 23.1 5.2 1.0 S
(0.909) (0.205) (0.039)
MF-S200 2.00 30 100 0.030 0.080 23.4 11.0 1.1 Std.
(0.921) (0.433) (0.043)
MF-S350 3.50 30 100 0.017 0.040 31.8 13.5 1.1 Std.
(1.252) (0.531) (0.043)
MF-S420 4.20 30 100 0.012 0.040 32.4 13.6 1.1 Std.
(1.276) (0.535) (0.043)
MF-D Series* 15 Volts
Disk Configuration 2.5 - 12.2 Amps Hold Current
Model
Ihold
Amperes
at 23 °C
V max.
Volts
I max.
Amps
Initial
Resistance
1 Hour (R1)
Post-Trip
Resistance Dimensions
mm/(in) Style
Ohms at 23 °C
Min. Max. A Max. B Max. C Max.
MF-D 2.5 15 10 0.015 0.032 14.4
(0.567) 6.3
(0.248) 0.36
(0.014) 1
MF-D 3.5 15 20 0.015 0.032 16.4
(0.646) 10.0
(0.394) 0.36
(0.014) 1
MF-D 5.5 15 40 0.014 0.30 16.08
(0.633) 9.0
(0.354) 0.36
(0.014) 1
MF-D 12.2 15 50 0.007 0.017 2.4
(0.945) –0.36
(0.014) 1
*For ordering information, contact your Bourns representative.
Features
■ Custom designs to meet appropriate applications
■ Compatible with current industry standards
■ Overcurrent and overtemperature protection
■ Standard and low-temperature material
■ Patents pending
Applications
■ Lithium cells
■ Battery cells
■ Powered toys
■ Motors
Disk & Chip Type PTC Products
A
BC
Style 1
Strap Products (Continued)
9
Features
■ Designed to Withstand Lightning Surge
■ Designed to Withstand AC Power Cross
■ Available in Matched Resistance “Bins”
Applications
■ CPE and Central Office
■ Access Equipment
■ Hybrid-Fiber Coax
Telecom Products
A
B
C
Style 1 Style 2
Style 4
Style 3
Style 5
B
B
C
C
A
A
A
C
B
B
A
C
MF-R/90 Series 90 Volts
Radial Leaded 0.55-0.75 Amps Hold Current
Initial 1 Hour (R1)
Resistance Post-Trip Dimensions
Ihold Resistance mm/(in)
Model Amperes V max. I max. Ohms at 23 °C Style
at 23 °C Volts Amps Min. Max. A Max. B Max. C Nom.
MF-R055/90 0.55 90 10 0.45 2.0 10.9 16.7 5.1 1
(0.43) (0.65) (0.201)
MF-R055/90U 0.55 90 10 0.45 2.0 10.3 16.7 5.1 1
(0.4) (0.65) (0.201)
MF-R075/90 0.75 90 10 0.37 1.65 11.9 15.5 5.1 1
(0.47) (0.61) (0.201)
MF-RX/250 Series 60 Volts
(Fast Trip, Small Package) 250 Vrms short duration interrupt
Radial Leaded 0.12-0.18 Amps Hold Current
Initial 1 Hour (R1)
Resistance Post-Trip Dimensions
Ihold Resistance mm/(in)
Model Amperes V max. I max. Ohms at 23 °C Style
at 23 °C Volts Amps Min. Max. A Max. B Max. C Max.
MF-RX012/250 0.12 60 3.0 4.0 16.0 6.5 11.0 5.1 2
(0.256) (0.433) (0.201)
MF-RX012/250-A 0.12 60 3.0 7.0 16.0 6.5 11.0 5.1 2
(0.256) (0.433) (0.201)
MF-RX012/250-C 0.12 60 3.0 5.5 14.0 6.5 11.0 5.1 2
(0.256) (0.433) (0.201)
MF-RX012/250-F 0.12 60 3.0 6.0 16.0 6.5 11.0 5.1 2
(0.256) (0.433) (0.201)
MF-RX012/250-1 0.12 60 3.0 6.0 16.0 6.5 11.0 5.1 2
(0.256) (0.433) (0.201)
MF-RX012/250-2 0.12 60 3.0 8.0 16.0 6.5 11.0 5.1 2
(0.256) (0.433) (0.201)
MF-RX012/250-T 0.12 60 3.0 7.0 16.0 6.5 11.0 5.1 2
(0.256) (0.433) (0.201)
MF-RX012/250U 0.12 60 3.0 6.0 16.0 6.0 10.0 5.1 3
(0.236) (0.394) (0.201)
MF-RX014/250 0.145 60 3.0 3.0 14.0 6.5 11.0 5.1 2
(0.256) (0.433) (0.201)
MF-RX014/250-A 0.145 60 3.0 3.0 12.0 6.5 11.0 5.1 2
(0.256) (0.433) (0.201)
MF-RX014/250-B 0.145 60 3.0 4.5 14.0 6.5 11.0 5.1 2
(0.256) (0.433) (0.201)
MF-RX014/250-T 0.145 60 3.0 5.4 14.0 6.5 11.0 5.1 2
(0.256) (0.433) (0.201)
MF-RX014/250U 0.145 60 3.0 3.5 12.0 6.0 10.0 5.1 3
(0.236) (0.394) (0.201)
MF-RX018/250 0.18 60 10.0 0.8 4.0 11.0 13.6 5.1 2
(0.433) (0.535) (0.201)
MF-RX018/250U 0.18 60 10.0 0.8 4.0 10.4 12.6 5.1 3
(0.409) (0.496) (0.201)
60 Volts
MF-R/600 Series 600 Vrms short duration interrupt
Radial Leaded 0.15-0.16 Amps Hold Current
Initial 1 Hour (R1)
Resistance Post-Trip Dimensions
Ihold Resistance mm/(in)
Model Amperes V max. I max. Ohms at 23 °C Style
at 23 °C Volts Amps Min. Max. A Max. B Max. C Max.
MF-R015/600 0.15 60 3.0 6.0 22.0 13.5 12.6 6.0 2
(0.531) (0.496) (0.236)
MF-R015/600-A 0.15 60 3.0 7.0 20.0 13.5 12.6 6.0 2
(0.531) (0.496) (0.236)
MF-R015/600-B 0.15 60 3.0 9.0 22.0 13.5 12.6 6.0 2
(0.531) (0.496) (0.236)
MF-R015/600-F 0.15 60 3.0 7.0 22.0 13.5 12.6 6.0 2
(0.531) (0.496) (0.236)
MF-R016/600 0.16 60 3.0 4.0 18.0 16.0 12.6 6.0 2
(0.629) (0.496) (0.236)
MF-R016/600-A 0.16 60 3.0 4.0 16.0 16.0 12.6 6.0 2
(0.629) (0.496) (0.236)
MF-R016/600-1 0.16 60 3.0 4.0 17.0 16.0 12.6 6.0 2
(0.629) (0.496) (0.236)
60 Volts
MF-SM013/250 Series 250 Vrms short duration interrupt
Surface Mount 0.13 Amps Hold Current
Initial 1 Hour (R1)
Resistance Post-Trip Dimensions
Ihold Resistance mm/(in)
Model Amperes V max. I max. Ohms at 23 °C Style
at 23 °C Volts Amps Min. Max. A Max. B Max. C Max.
MF-SM013/250-2 0.13 60 3.0 6.5 20.0 9.4 3.7 7.4 4
(0.370) (0.146) (0.291)
MF-SM013/250-A-2 0.13 60 3.0 6.5 20.0 9.4 3.7 7.4 4
(0.370) (0.146) (0.291)
MF-SM013/250-B-2 0.13 60 3.0 9.0 20.0 9.4 3.7 7.4 4
(0.370) (0.146) (0.291)
MF-SM013/250-C-2 0.13 60 3.0 7.0 20.0 9.4 3.7 7.4 4
(0.370) (0.146) (0.291)
60 Volts
MF-SM013/250V Series 250 Vrms short duration interrupt
Surface Mount 0.13 Amps Hold Current
Model
Ihold
Amperes
at 23 °C
V max.
Volts
I max.
Amps
Initial
Resistance
1 Hour (R1)
Post-Trip
Resistance Dimensions
mm/(in) Style
Ohms at 23 °C
Min. Max. A Max. B Max. C Max.
MF-SM013/250V 0.13 250 3.0 6.5 20.0 6.6
(0.260) 7.4
(0.291) 3.2
(0.126) 5
10
CMF-RL Series 230 Volts
Radial Leaded ±0.5 Ohms Packaging Resistance Matching
Model
Induction
Voltage
Withstand
VAC
Rated
Resistance
(RN) Hold
Current
Amps at 25 °C
Trip
Current
Amps at 25 °C
Dimensions
mm/(in) Style
Ohms Tolerance A Max. B Max. C Nom.
CMF-RL10 650 10 ±20 % 0.14 0.3 9.5
(0.374) 4.5
(0.177) 13.5
(0.531) 1
CMF-RL10-10 650 10 ±10 % 0.14 0.3 9.5
(0.374) 4.5
(0.177) 13.5
(0.531) 1
CMF-RL25U 650 35 ±20 % 0.060 0.15 5.2
(0.205) 3.5
(0.138) 5.2
(0.205) 2
CMF-RL35 650 35 ±20 % 0.075 0.15 9.8
(0.386) 5.0
(0.197) 13.5
(0.531) 1
CMF-RL35-10 650 35 ±10 % 0.075 0.15 9.8
(0.386) 5.0
(0.197) 13.5
(0.531) 1
CMF-RL35A 650 35 ±10 % 0.075 0.15 7.5
(0.295) 5.6
(0.220) 13.0
(0.512) 1
CMF-RL35A-10 650 35 ±10 % 0.075 0.15 7.5
(0.295) 5.6
(0.220) 13.0
(0.512) 1
CMF-RL50 650 50 ±20 % 0.065 0.15 9.8
(0.386) 5.0
(0.197) 13.5
(0.531) 1
CMF-RL50-10 650 50 ±10 % 0.065 0.15 9.8
(0.386) 5.0
(0.197) 13.5
(0.531) 1
CMF-RL50A 650 50 ±20 % 0.05 0.10 7.5
(0.295) 5.6
(0.220) 13.0
(0.512) 1
CMF-RL50A-10 650 50 ±10 % 0.05 0.10 7.5
(0.295) 5.6
(0.220) 13.0
(0.512) 1
CMF-RL55 650 55 ±20 % 0.065 0.15 9.8
(0.386) 5.0
(0.197) 13.5
(0.531) 1
CMF-RL55-10 650 55 ±10 % 0.065 0.15 9.8
(0.386) 5.0
(0.197) 13.5
(0.531) 1
CMF-RL55A 650 55 ±20 % 0.05 0.10 7.5
(0.295) 5.6
(0.220) 13.0
(0.512) 1
CMF-RL55A-10 650 55 ±10 % 0.05 0.10 7.5
(0.295) 5.6
(0.220) 13.0
(0.512) 1
Features
■ Ceramic PTCs for telecom overcurrent
protection
■ Wide range of form factors for most
applications
■ Aids telecom compliance with:
- ITU-T K.20/21/45
- Telcordia GR-1089-CORE
- UL 60950, 3rd Ed.
■ Narrow and matched resistance tolerances
Applications
Used as secondary overcurrent protection
devices in:
■ Customer Premise Equipment (CPE)
■ Central Office Equipment (CO)
■ Access Equipment
Style 1 Style 2 Style 3 Style 4
Style 5
ABAB
CC
A
B
C
AA
Style 6
A
BB
CC
B
C
Ceramic PTC Products
Ceramic Housing
CMF-RLC Series ±0.5 Ohms Packaging
Through-hole/Ceramic Case Resistance Matching
Model
Induction
Voltage
Withstand
VAC
Rated
Resistance
(RN) Hold
Current
Amps at 25 °C
Trip
Current
Amps at 25 °C
Dimensions
mm/(in) Style
Ohms Tolerance A Max. B Max. C Nom.
CMF-RLC50 650 50 ±20 % 0.065 0.15 9.2
(0.362) 4.7
(0.185) 9.6
(0.378) 3
CMF-RLC50-10 650 50 ±10 % 0.065 0.15 9.2
(0.362) 4.7
(0.185) 9.6
(0.378) 3
230 Volts
CMF-RD Series ±0.5 Ohms Packaging
Twin Pack/Through-hole Resistance Matching
Model
Induction
Voltage
Withstand
VAC
Rated
Resistance
(RN) Hold
Current
Amps at 25 °C
Trip
Current
Amps at 25 °C
Dimensions
mm/(in) Style
Ohms Tolerance A Max. B Max. C Nom.
CMF-RD50 600 50 ±20 % 0.09 0.19 9.0
(0.354) 10.2
(0.402) 9.5
(0.446) 4
CMF-RD50-10 600 50 ±10 % 0.09 0.19 9.0
(0.354) 10.2
(0.402) 9.5
(0.446) 4
230 V Rated
CMF-SD Series ±0.5 Ohms Resistance
Twin Pack/SMD Matching in Housing
Model
Induction
Voltage
Withstand
VAC
Rated
Resistance
(RN) Hold
Current
Amps at 25 °C
Trip
Current
Amps at 25 °C
Dimensions
mm/(in) Style
Ohms Tolerance A Max. B Max. C Nom.
CMF-SD25 600 25 ±20 % 0.13 0.26 9.0
(0.354) 10.8
(0.425) 10.2
(0.402) 5
CMF-SD25-10 600 25 ±10 % 0.13 0.26 9.0
(0.354) 10.8
(0.425) 10.2
(0.402) 5
CMF-SD25A 600 25 ±20 % 0.13 0.26 7.15
(0.281) 8.5
(0.335) 8.1
(0.319) 5
CMF-SD25A-10 600 25 ±10 % 0.13 0.26 7.15
(0.281) 8.5
(0.335) 8.1
(0.319) 5
CMF-SD35 600 35 ±20 % 0.10 0.20 9.0
(0.354) 10.8
(0.425) 10.2
(0.402) 5
CMF-SD35-10 600 35 ±10 % 0.10 0.20 9.0
(0.354) 10.8
(0.425) 10.2
(0.402) 5
CMF-SD35A 600 35 ±20 % 0.10 0.20 7.15
(0.281) 8.5
(0.335) 8.1
(0.319) 5
CMF-SD35A-10 600 35 ±10 % 0.10 0.20 7.15
(0.281) 8.5
(0.335) 8.1
(0.319) 5
CMF-SD50 600 50 ±20 % 0.09 0.19 9.0
(0.354) 10.8
(0.425) 10.2
(0.402) 5
CMF-SD50-10 600 50 ±10 % 0.09 0.19 9.0
(0.354) 10.8
(0.425) 10.2
(0.402) 5
CMF-SD50A 600 50 ±20 % 0.09 0.19 7.15
(0.281) 8.5
(0.335) 8.1
(0.319) 5
CMF-SD50A-10 600 50 ±10 % 0.09 0.19 7.15
(0.281) 8.5
(0.335) 8.1
(0.319) 5
Four CPTCs in One Package
CMF-RQ Series ±0.5 Ohms Resistance
Quad Pack/Through-hole Matching in Housing
Model
Induction
Voltage
Withstand
VAC
Rated
Resistance
(RN) Hold
Current
Amps at 25 °C
Trip
Current
Amps at 25 °C
Dimensions
mm/(in) Style
Ohms Tolerance A Max. B Max. C Nom.
CMF-RQ50 600 50 ±20 % 0.09 0.19 10.0
(0.393) 21.0
(0.826) 11.0
(0.433) 6
CMF-RQ50-10 600 50 ±10 % 0.09 0.19 10.0
(0.393) 21.0
(0.826) 11.0
(0.433) 6
11
MF - RX 012/250 U - A 05 - 2
Bourns® Multifuse® Product Designator
Series
D = Disk Configuration
LR = Axial Leaded Strap
LS = Axial Leaded Strap
MSMF = Surface Mount
NSMF = Surface Mount
PSMF = Surface Mount
R = Radial Leaded
RG = Radial Leaded
RHT = High Temp. Radial Mount
RX = Radial Leaded
S = Axial Leaded Strap
SM = Surface Mount
SMDF = Surface Mount
SMHT = High Temp. Surface Mount
SVS = Axial Leaded Strap
USMF = Surface Mount
VS = Axial Leaded Strap
VSN = Axial Leaded Strap
Hold Current, Ihold
Voltage Options:
Max. Interrupt Voltage, V
Construction Options:
N = Narrow Device Option (3.6 mm)*
S = Slotted Lead Option (one side)*
SS = Slotted Lead Option (two sides)*
U = Uncoated
T = Pretripped **
Resistance Sorted**
(see individual data sheets)
Resistance Bins of 0.5 Ω***
05 = 0.5 Ω
Packaging Options
- 0 = Bulk Packaging
- 2 = Tape and Reel
- AP = Ammo-Pak
*Axial Leaded Strap products only.
**Telecom Radial Leaded products only.
***Radial Leaded products only.
How To Order
Agency Approvals
Bourns® PPTCs are certified under UL, CSA, IEC and
TÜV registration programs.
Current, Hold (Ihold)
The maximum current a PPTC device can pass without
interruption.
Current, Maximum (Imax)
The maximum fault current a PPTC device can
withstand without damage at the rated voltage.
Current, Trip (Itrip)
The minimum current that will switch a PPTC from the
low resistance to the high resistance state.
Fault Current
The peak current that flows through a PPTC or wire
during a short circuit or arc back.
Positive Temperature Coefficient (PTC)
A characteristic of the PPTC device that describes the
large increase in resistance as the device reaches its
switching (trip) temperature.
Resistance, Post Trip (R1max)
The maximum resistance one hour after a PPTC device
has been tripped and power has been removed.
Resistance, Post Reflow (R1max)
The maximum resistance one hour after a PPTC surface
mount device has been reflow soldered.
Voltage, Maximum (Vmax)
The maximum voltage a PPTC device can withstand
without damage at the rated current.
Definitions
1. What is the normal circuit operating current (Ihold)
2. What is the maximum circuit voltage (Vmax)
3. What is the maximum fault current (Imax)
4. What is the preferred form factor
Note: Other factors including thermal derating and time to
trip characteristics may be important application
considerations. Please refer to the full Bourns® data sheet of
each product at www.bourns.com/multifuse.
Product Selection Worksheet
UL File Number................................................E 174545S
CSA File Number .............................................CA 110338
TÜV File Number ............................................R2057213
Agency File Numbers
Worldwide Sales Oces
Country Phone Fax
Benelux: +41 (0)41 768 5555 +41 (0)41 768 5510
Brazil: +55 11 5505 0601 +55 11 5505 4370
China: +86 21 64821250 +86 21 64821249
France: +33 (0)2 5473 5151 +33 (0)2 5473 5156
Germany: +49 (0)69 800 78212 +49 (0)69 800 78299
Ireland/UK: +44 (0)1276 691087 +44 (0)1276 691088
Italy: +41 (0)41 768 5555 +41 (0)41 768 5510
Japan: +81 49 269 3204 +81 49 269 3297
Malaysia (KL Oce): +60 3 71183138 +60 3 71183139
Malaysia (Penang Oce): +60 4 6581771 +60 4 6582771
Singapore: +65 63487227 +65 63481272
Switzerland: +41 (0)41 768 5555 +41 (0)41 768 5510
Taiwan: +886 2 25624117 +886 2 25624116
UK/Ireland: +44 (0)1276 691087 +44 (0)1276 691088
USA: +1-951-781-5500 +1-951-781-5006
Non-Listed European
Countries: +41 (0)41 768 5555 +41 (0)41 768 5510
Technical Assistance
Region Phone Fax
Asia-Pacic: +886 2 25624117 +886 2 25624116
Europe: +41 (0)41 768 5555 +41 (0)41 768 5510
Americas: +1-951-781-5500 +1-951-781-5700
www.bourns.com
Bourns® products are available through an extensive global network of representatives and distributors.
To obtain technical applications assistance, a quotation, or to place an order, contact a Bourns representative in your area.
Specications subject to change without notice. Actual performance in specic customer applications may dier due to the
inuence of other variables. Customers should verify actual device performance in their specic applications.
“Bourns” and "Multifuse" are registered trademarks of Bourns, Inc. in the U.S. and other countries.
COPYRIGHT© 2008, BOURNS, INC. • LITHO IN U.S.A. • WAG • 03/08 • 10M/MF0714