Challenger CDK3300WBU Molded Case Circuit Breaker

Challenger CDK3300WBU Molded Case Circuit Breaker is a three‑pole molded‑case breaker rated for 300 A at 240 V, and it belongs to Challenger’s CDK family. It provides thermal‑magnetic protection with a 65 kA short‑circuit rating (AIC) at 240 V, suitable for guarding feeders and main circuits in 3‑phase commercial or light‑industrial panels. As a Series C CDK‑type MCCB, the unit is built in a molded‑case enclosure designed for durable protection of 3‑phase power distribution and motor feeders in facilities powered by 240 V three‑phase systems. Typical applications include service entrances, distribution panels, and motor feeders where a 300 A rating and 65 kA interrupting capability are required. When replacing legacy Challenger or CDK units, verify the exact model number, voltage, and current ratings to ensure compatibility with the panel and the intended protection scheme.