Challenger CDK3250 U Molded Case Circuit Breaker

Challenger CDK3250 U is a three-pole molded-case circuit breaker rated for 250 A and 600 V AC, designed to protect heavy three-phase feeders in commercial and industrial panels. The CDK3250 U belongs to Challenger’s CDK family and uses a compact molded-case frame with a CDK-type trip mechanism for reliable overcurrent protection. It is commonly listed with an interrupting capacity of 65 kAIC at 240 V, a figure that supports high fault currents in many distribution environments, though exact ratings can vary by listing. The 3P configuration makes it suitable for standard 3‑phase electrical systems, and the 250 A rating suits feeders and larger equipment enclosures. When selecting, verify compatibility with your panel model and the required interrupting rating at your system voltage, as interchangeability and trip characteristics depend on the installation. Challenger’s legacy line has been carried forward in Eaton’s Cutler-Hammer portfolio, which can influence sourcing decisions for replacements or cross-references in older installations.