The CTB-B-B-04 is a single-pole, rocker-actuated thermal circuit breaker designed for equipment protection. It features a 4-amp current rating, a black bezel, and a black rocker, and is designed for simple snap-in mounting into a 16mm round double D panel cutout. This model accommodates panel thicknesses from .032 to .062 inches and operates at voltages up to 250VAC or 50VDC with a 1,000 AIC rating. Common applications include household appliances, power strips, audio-visual equipment, and marine systems.