General Purpose Fuses
General Purpose Fuses
48 www.littelfuse.com © 2005 Littelfuse • POWR-GARD™ Products Catalog
Plug Fuses
125 VAC • Time-Delay • 1/4 – 30 Amperes
Edison-base Plug fuses
TOO Fuses are dual-element time-delay Edison-base fuses designed for
motor and motor branch circuit protection; also suitable for all general purpose
circuits. Use for replacement purposes only.
Ampere Ratings
3⁄10 11⁄821⁄44 7 15
4⁄10 11⁄421⁄241⁄28 20
1⁄214⁄10 28⁄10 5 9 25
6⁄10 16⁄10 3 5 6⁄10 10 30
8⁄10 18⁄10 32⁄10 6 12
1 2 31⁄261⁄414
TLO Fuses are medium time-delay Edison-base fuses designed for general
purpose branch circuit protection. See TOO and SOO fuses for motor
protection. Use for replacement purposes only.
Ampere Ratings
15 20 25 30
Type S Plug fuses
SOO Fuses are dual-element time-delay Type S fuses designed for motor and
motor branch circuit protection; also suitable for all general purpose circuits.
Ampere Ratings
1⁄41 2 31⁄261⁄414
3⁄10 11⁄821⁄44 7 15
4⁄10 11⁄421⁄241⁄28 20
1⁄214⁄10 28⁄10 5 9 25
6⁄10 16⁄10 3 56⁄10 10 30
8⁄10 18⁄10 32⁄10 6 12
SLO Fuses are medium time-delay Type S fuses for general purpose branch
circuit protection.
Ampere Ratings
15 20 25 30
Littelfuse Plug fuses provide overcurrent protection to general purpose
circuits and small motor loads. Edison-base Plug fuses (TOO and TLO
series) feature metal threads similar to incandescent lamp bases. Type S
Plug fuses (SOO and SLO series) utilize a nonmetallic threaded base and
must be used with Type S adapters (SAO series). The National Electrical
Code permits Edison-base Plug fuses to be used for replacement
purposes only. Type S fuses and adapters prevent shunting open fuses
and over-fusing.
SAO
Adapter Rating
Accepts
Fuse Ratings:
Other SOO Fuse
Ratings Which Fit
SAO 1 3⁄10 – 1 —
SAO 11⁄411⁄8, 11⁄43⁄10 – 1
SAO 16⁄10 14⁄10, 16⁄10 3⁄10 – 11⁄4
SAO 2 18⁄10, 2 —
SAO 21⁄221⁄4, 21⁄218⁄10, 2
SAO 32⁄10 28⁄10, 32⁄10 18⁄10 – 21⁄2
SAO 4 31⁄2, 4 —
SAO 5 41⁄2, 5 31⁄2, 4
SAO 61⁄431⁄2, 61⁄431⁄2 – 5
SAO 8 7, 8 —
SAO 15 7, 8, 9 10, 12, 14, 15 7, 8, 9, 10
SAO 20 20 only —
SAO 30 20, 25, 30 —
Specifications
Voltage Rating: 125 VAC
Interrupting Rating: 10,000 amperes rms symmetrical
Approvals: UL Listed Plug Fuses, Standard UL 248-11
Note: See NEC Article 240-V for additional information on Plug fuse applications.