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 104°F (40°C) 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 Ciecuit Beaker Shunt Trip, 110-130VAC. This product complies to UL & CSA certifications.