The 1-1423364-4 is a compact, single-pole thermal circuit breaker designed for supplementary equipment protection with push-to-reset operation and visual trip indication. It features current ratings from 3 to 20 amps with typical resistance values ranging from 0.083 ohms at 3A to 0.012 ohms at 20A, and operates continuously at 100% of its rated current while tripping between 101% and 134%, with guaranteed trip at 135% within one hour at 25°C. The breaker includes a dielectric strength of 1,500 VAC (60 seconds), operates over a temperature range of 0°C to +60°C, and provides multiple mounting and termination options including 0.250" quick connects and various bushing configurations (3/8"-24 UNF, M11×1.0, M12×1.0 threads). With UL1077 recognition as a supplementary protector, VDE 0642/EN60934 approval, and CCC mark compliance, this breaker is ideal for industrial equipment, power distribution panels, and applications requiring reliable overload and short-circuit protection with compact form factor and easy reset capability.