Industrial DB3-B0-46-640-121-C Circuit Breaker

The DB3-B0-46-640-121-C is a three-pole hydraulic-magnetic circuit breaker from Carling Technologies (the Carlingswitch lineage), rated at 40 A for 480/277 VAC three-phase service. It protects three-phase circuits and equipment—such as motors, pumps, conveyors, and panel boards—by interrupting fault currents with a hydraulic-magnetic trip mechanism designed for rugged industrial environments. This DB3B046640121C variant sits in Carling’s DB3 family, offering a compact form factor and proven performance for industrial distribution panels, machine controls, and other three-phase applications where dependable overcurrent protection is required. When selecting a replacement or cross-reference, verify the exact mounting footprint, terminal configuration, and trip characteristics against Carling’s catalog or authorized distributors to ensure proper fit and electrical compatibility in your installation.