The Square D i-Line MX36800 S5B circuit breaker 3 pole 800A 600VAC 60Hz - fresh cal is a circuit protection device from Square D. It shields downstream wiring and equipment from damage by interrupting the circuit during a fault or overload. Key specifications noted on this listing include 600VAC, 800A, 3 Pole. It is commonly in power distribution panels and industrial control circuits.
