The 121B20-00M-KA is a Type I, single-pole thermal circuit breaker with a 20A rating at 12VDC. It features a durable metal cover and provides termination via two #10-32 studs, supplied with assembled Keps lock nuts. This breaker offers branch circuit protection with an interrupt rating of 2.5kA at 12VDC and is designed to operate in temperatures from -40°C to 85°C. Compliant with SAE J553 and SAE J1171 for ignition protection, it is ideal for use in trucks, buses, RVs, and trolling motors.