Square D PowerPacT H, J and L-frame circuit breakers are designed to protect electrical systems from damage caused by overloads and short circuits. Molded case circuit breakers are available with either thermal-magnetic or Micrologic electronic trip units. This ia a connection accessory for rear connected circuit breakers. This is a PowerPacT Multistandard connection accessory for PowerPacT J. This accessory is for a 3 pole circuit breaker. This will be installed on top and bottom of breakers. There are 4 short rear connectors and 2 covers provided.