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 nut insert kit is a connection accessory for PowerPact H-Frame, circuit breaker. This product complys to UL standards and come in set of 3.