Square D MH36300 – 300A 3 Pole Molded Case Circuit Breaker Professional Grade

Designed for rapid installation, this 300A molded case circuit breaker delivers reliable long-time and instantaneous protection. The unit features an I-Line mounting style, allowing it to plug securely into compatible Square D switchboards. For modernizing older infrastructure, this M-Frame breaker is often replaced by the newer PowerPact MJA36300 series. Rated for 65kA at 480VAC, it incorporates a Visi-Trip indicator to help maintenance personnel quickly identify faulted circuits.