1© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 • 864-963-6300 • www.kemet.com SE0202_OHD • 11/22/2017
One world. One KEMET
Benets
• Extremely simple circuit design
• High reliability for on/off operations
• Compatibility with extremely low (0.1 mW or lower) signals
to high power (6 W) levels
• Compact, light and easy to handle
• Dust, explosion and corrosion-proof
• High-speed response
• Wide range of operating temperatures available in 5°C
increments from +30°C to +120°C
Overview
The OHD™ Thermal Guard is developed for thermal
problem countermeasures and safety standard conformity,
which are becoming increasingly important for electronic
devices in recent years.
Applications
Typical applications include atmospheric temperature
detection and overheating monitoring of power transistors,
power modules, room heaters, hot gas heaters, PPCs,
ampliers, motors, HDDs, FDDs and other general
appliances.
Sensors
OHD™ Thermal Guard
Ordering Information
OHD 1- 40 B
Series Model Number Operating Temperature (°C) Contact Type
OHD 1
3
5R
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
B = Break
M = Make
(OHD1 and
OHD3 Series
only)
2© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 • 864-963-6300 • www.kemet.com SE0202_OHD • 11/22/2017
Sensors – OHD™ Thermal Guard
Dimensions in mm
18.0
45.0 Maximum
Mounting
surface
Marked surface
φ0.7 Maximum
5.5
5.6
10.0
6.0
6.1 8.0
Mounting
surface
Mounting
surface
0.3
φ3.3
6.5
27.0 Maximum
φ6.2 φ3.2
3.0
23.0
13.5
12.5 Maximum
6.0
3.0 Minimum
6.0
0.5
3.7
6.112.010.0 1.0
5.0
2.65
2.65
0.3
5.08
0.5
φ3.2
6.7
OHD1 OHD1 Mounting Bracket
OHD3 OHD5R
*Mounting brackets
exclusively for the OHD1 type
are provided optionally (at
separate cost).
Environmental Compliance
All OHD sensors are RoHS compliant.
Insulation & Temperature Characteristics
Series
Insulation
Withstand
Voltage1
Minimum
Insulation
Resistance1
Operating
Temperature
Range (°C)
Differential
Temperature
(°C)2
OHD1
2,500 VAC/1 minute or
3,000 VAC/1 second
500 VDC to 100 MΩ
30 – 120
10 MaximumOHD3
OHD5R 1,500 VAC /1 minute or
1,800 VAC /1 second 60 – 120
1 Between terminals and mounting resin surface.
2 The differential temperature is also referred to as the hysteresis temperature on thermal sensors.
3© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 • 864-963-6300 • www.kemet.com SE0202_OHD • 11/22/2017
Sensors – OHD™ Thermal Guard
Table 1 – Ratings & Part Number Reference
Part Number
Operating
Temperature
(°C)
Contact
Type
Maximum
Opening/
Closing
Voltage (V)
Maximum
Opening/
Closing
Current (A)
Maximum
Opening/
Closing
Power (W)
Minimum
Opening/
Closing
Current
Maximum
Contact
Resistance
(mΩ)
OHD1-40M 40 Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-45M 45 Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-50M 50 Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-55M 55 Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-60M 60 Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-65M 65 Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-70M 70 Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-75M 75 Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-80M 80 Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-85M 85 Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-90M 90 Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-95M 95 Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-100M 100 Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-105M 105 Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-110M 110 Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-115M 115 Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-120M 120 Make 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-30B 30 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-35B 35 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-40B 40 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-45B 45 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-50B 50 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-55B 55 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-60B 60 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-65B 65 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-70B 70 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-75B 75 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-80B 80 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-85B 85 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-90B 90 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-95B 95 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-100B 100 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-105B 105 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-110B 110 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-115B 115 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD1-120B 120 Break 110 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-40M 40 Make 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-45M 45 Make 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-50M 50 Make 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-55M 55 Make 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-60M 60 Make 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-65M 65 Make 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-70M 70 Make 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-75M 75 Make 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-80M 80 Make 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-85M 85 Make 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-90M 90 Make 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-95M 95 Make 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-100M 100 Make 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-105M 105 Make 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-110M 110 Make 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-115M 115 Make 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-120M 120 Make 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-30B 30 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-35B 35 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-40B 40 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-45B 45 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-50B 50 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
Part Number Operating
Temperature (°C) Contact Type Maximum
Opening/Closing
Voltage (V)
Maximum
Opening/Closing
Current (A)
Maximum
Opening/Closing
Power (W)
Minimum
Opening/Closing
Current
Maximum
Contact
Resistance (mΩ)
4© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 • 864-963-6300 • www.kemet.com SE0202_OHD • 11/22/2017
Sensors – OHD™ Thermal Guard
Table 1 – Ratings & Part Number Reference cont’d
Precautions
Before Using Thermal Guard
• Please read specications and check the content thoroughly before the actual use.
• Do NOT use product under mechanical weight load.
• Do NOT use with a greater load than specied.
• Do NOT use in close proximity to strong magnetic parts and avoid exposure to a magnetic eld.
• Do NOT use if dropped or severely shocked.
• The OHD1 and OHD5R are designed for printed circuit board insertion. The OHD3 is a reed wire soldered type.
Part Number
Operating
Temperature
(°C)
Contact
Type
Maximum
Opening/
Closing
Voltage (V)
Maximum
Opening/
Closing
Current (A)
Maximum
Opening/
Closing
Power (W)
Minimum
Opening/
Closing
Current
Maximum
Contact
Resistance
(mΩ)
OHD3-55B 55 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-60B 60 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-65B 65 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-70B 70 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-75B 75 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-80B 80 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-85B 85 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-90B 90 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-95B 95 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-100B 100 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-105B 105 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-110B 110 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-115B 115 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD3-120B 120 Break 100 AC/DC 0.3 AC/DC 6 AC/DC 0.1 mA/1 VDC 150
OHD5R-60B 60 Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300
OHD5R-65B 65 Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300
OHD5R-70B 70 Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300
OHD5R-75B 75 Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300
OHD5R-80B 80 Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300
OHD5R-85B 85 Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300
OHD5R-90B 90 Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300
OHD5R-95B 95 Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300
OHD5R-100B 100 Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300
OHD5R-105B 105 Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300
OHD5R-110B 110 Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300
OHD5R-115B 115 Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300
OHD5R-120B 120 Break 30 DC 0.1 DC 1 DC 0.1 mA/1 VDC 300
Part Number Operating
Temperature (°C) Contact Type Maximum
Opening/Closing
Voltage (V)
Maximum
Opening/Closing
Current (A)
Maximum
Opening/Closing
Power (W)
Minimum
Opening/Closing
Current
Maximum
Contact
Resistance (mΩ)
5© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 • 864-963-6300 • www.kemet.com SE0202_OHD • 11/22/2017
Sensors – OHD™ Thermal Guard
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Disclaimer
All product speci cations, statements, information and data (collectively, the “Information”) in this datasheet are subject to change. The customer is responsible for
checking and verifying the extent to which the Information contained in this publication is applicable to an order at the time the order is placed.
All Information given herein is believed to be accurate and reliable, but it is presented without guarantee, warranty, or responsibility of any kind, expressed or implied.
Statements of suitability for certain applications are based on KEMET Electronics Corporation’s (“KEMET”) knowledge of typical operating conditions for such
applications, but are not intended to constitute – and KEMET speci cally disclaims – any warranty concerning suitability for a speci c customer application or use.
The Information is intended for use only by customers who have the requisite experience and capability to determine the correct products for their application. Any
technical advice inferred from this Information or otherwise provided by KEMET with reference to the use of KEMET’s products is given gratis, and KEMET assumes no
obligation or liability for the advice given or results obtained.
Although KEMET designs and manufactures its products to the most stringent quality and safety standards, given the current state of the art, isolated component
failures may still occur. Accordingly, customer applications which require a high degree of reliability or safety should employ suitable designs or other safeguards
(such as installation of protective circuitry or redundancies) in order to ensure that the failure of an electrical component does not result in a risk of personal injury or
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measures may not be required.
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