The PowerPact H-frame circuit breakers are designed to protect electrical systems from damage caused by overloads and short circuits. H-frame circuit breakers are available with either thermal-magnetic or Micrologic electronic trip units. The amperage ratings of the thermal trip elements are calibrated at 104F (40C) free air ambient temperature. Per the National Electric Code (NEC) and the Canadian Electrical Code, standard circuit breakers may only be applied continuously at up to 80% of their rating. This PowerPact H Circuit Beaker Shunt Trip, 110-130VAC. This product complies to UL & CSA certifications.