RJF36120CU44AE1AC – SQUARE D 3P1200A 600V BREAKER

The Square D RJF is a large-frame molded-case circuit breaker series rated for high-ampacity, high-voltage commercial and industrial duty — in this case 1200A at 600V, 3-pole. It is significantly larger than residential or light-commercial frames (such as QO or Homeline) and is designed for panelboards, switchboards, and motor control centres rather than residential loadcentres. The RJF frame offers robust thermal-magnetic or electronic trip mechanisms suited to demanding feeder and main protection duties.

Availability of specific RJF-frame configurations can vary — some variants have been discontinued or are hard to find through standard distribution channels. Northern Breaker Group specialises in obsolete and hard-to-find breakers across Canada. Contact our Calgary, Edmonton, or Vancouver counters with the full part number and we'll locate new, surplus, or reconditioned stock and provide a quote.

Before installation, confirm: (1) your panelboard or switchboard is rated to accept an RJF-frame bolt-on breaker at 1200A/600V; (2) the bus bar ampacity and bracing match or exceed 1200A; (3) the available fault current (SCCR) at the installation point does not exceed the breaker's interrupting rating; and (4) the installation complies with the Canadian Electrical Code (CEC), including proper conductor sizing for a 1200A feeder. We recommend having a licensed electrician or engineer review the installation.