Challenger CDK3300U Molded Case Circuit Breaker

The Challenger CDK330U Molded Case Circuit Breaker is a three-pole, 300-amp protective device designed for 240-volt systems. This CDK Series breaker is UL-listed and provides a 65 kA short-circuit interrupting rating at 240 V. It employs a thermal-magnetic trip mechanism with Long-Time and Instantaneous trip functions to protect conductors and equipment from overloads and faults. Encased in a molded-case enclosure, the unit is intended for panel mounting in electrical distribution spaces and is rated for ambient temperatures up to 40°C. The 3P, 240 V rating and 300 A frame support protection for sizable feeders and branch circuits, while the 65 kAIC rating indicates the maximum fault current it can safely interrupt at the specified voltage. This CDK330U model belongs to Challenger’s CDK line of molded-case breakers, offering standard protection characteristics and robust construction for industrial and commercial electrical protection tasks.