The 1170-21-20A is a compact, single-pole thermal circuit breaker rated for 20A. It features a push-to-reset, trip-free, snap-action mechanism with a separate manual release. This model is designed with blade terminals and retaining clips for standard automotive fuse blocks, conforming to DIN 72581, part 3. It operates at a nominal voltage of DC 24V and has an interrupting capacity of 400A. The device is suitable for extra low voltage wiring systems in vehicles and marine craft, offering reliable protection in an ambient temperature range of -40°C to +85°C.