Square D EHB34050-1082 Miniature Circuit Breaker

Select this 50A breaker when the circuit design calls for that current rating. Coordinate the breaker rating with the load requirements and conductor ampacity.

Bolt-on mounting uses a bolted attachment rather than a plug-on connection. Plan the installation around that fastening method.

The lug terminals accept conductors from 12 AWG through 2 AWG. Choose a conductor within that terminal range that also meets the circuit's ampacity requirements; terminal acceptance alone does not determine conductor sizing.

The thermal element provides delayed, long-time response to sustained overloads, while the magnetic element provides instantaneous response to high fault current. These functions address overload and short-circuit protection.

No. The trip settings are fixed, so selection must account for the load's operating and starting characteristics rather than relying on field adjustment.

Match both the circuit voltage and system arrangement to the breaker rating. The 480Y/277VAC rating refers to a wye system, so voltage alone is not enough to guide selection.

The 14kAIC at 480Y/277VAC rating sets the interrupting capacity at that voltage. Compare it with the available fault current at the installation point, which must not exceed the applicable interrupting rating.

The three poles place overcurrent protection on the phase conductors of a three-phase circuit. Account for both pole count and phase arrangement when reviewing the circuit's protection requirements.