PowerPacT J-Frame circuit breakers are designed to protect electrical systems from damage caused by overloads and short circuits. PowerPacT J-Frame circuit breakers are available with either sealed or interchangeable thermal magnetic or Micrologic electronic trip protection units. This is a field-installable thermal magnetic trip unit for Powerpact J that has a 150-250A frame. It is a 3 pole trip unit rated 150A, 600VAC. PowerPacT J circuit breakers comply to UL, CSA, NOM, and IEC standards and are CE marked.