This document introduces NEC's SEFUSE (SM/G series) thermal cutoff, which is a small, solid, and reliable fuse that can be used under 0.5 A / 250 Vac. Recently added 3 and 5 ampere / 50 Vdc models are also available. It protects home appliances and industrial equipment from fire and accidents by opening the electrical circuit if it detects abnormal temperature rise.
This document provides technical specifications for the NEC SEFUSE™ SM/G Series, a small solid-state thermal sensitive fuse. It is designed to protect home appliances and industrial equipment from fire by opening an electrical circuit upon sensing abnormal temperature rises.
The datasheet covers standard ratings for AC (0.5A) and DC (3A and 5A), outlines physical dimensions, defines key terms such as rated functioning temperature and holding temperature, and lists specific design cautions regarding mounting and usage environments.
| Rated Current (AC) | 0.5 Amperes |
|---|---|
| Rated Current (DC) | 3 and 5 Amperes |
| Rated Voltage (AC) | 250 Vac |
| Safety Standards | UL, CSA, VDE, BEAB, MITI |
| Operating Temperature Range | +0/-10 °C |
It protects home appliances and industrial equipment from fire by opening an electrical circuit if it senses an abnormal temperature rise.
No, it is not designed to cut excess current; using it as a current fuse may cause malfunction.
The recommended maximum body temperature is 125°C when passing 1A to 2A of current.