The ABB catalog number THHQC21100WL refers to a reliable Q Line Circuit Breaker, designed with a compact one-inch width per pole. These thermal-magnetic breakers are a solid choice for both residential and commercial setups. Known for their quick-make and quick-break operation, Q Line breakers come with common trip bars and clear trip indicators, making it easy to spot when they've tripped—definitely a safety win. You’ll find them available in configurations of 1, 2, or 3 poles, and they can be fitted with optional accessories like auxiliary contacts and shunt trips for added functionality. This particular breaker is a lug-lug version suitable for mounting on a 35mm DIN rail. Distributed by BSP Automation, the THHQC21100WL is a straightforward, no-nonsense component that engineers and electricians can count on to get the job done right.