The PowerPacT H, J and L frame circuit breakers are designed to protect electrical systems from damage caused by overloads and short circuits. H and J frame circuit breakers are available with either thermal magnetic or electronic Micrologic tripping devices. Thermal tripping device current ratings are calibrated at 40°C ambient. According to the National Electric Code (NEC) and the Canadian Electrical Code, standard circuit breakers are only allowed to operate continuously at up to 80% of their rated capacity. This PowerPacT J circuit breaker is 3 pole and has a breaking capacity of 25kA@600V AC and a current rating of 250A. It is a panel mount circuit breaker that meets UL, IEC, CCC, CE and CSA standards. It has a magnetic holding current of 1250A and a magnetic tripping current of 2500A. The dimensions of this circuit breaker are 104.6mm x 191mm x 127mm (WxHxD) and it is designed for an ambient temperature of 40°C. This product comes with an 18-month warranty.