Square D EH14040 40A 1-Pole 277 V Circuit Breaker

The Square D EH14040 is a 40A, 1-Pole circuit breaker designed for 277 V branch circuits. With the part number EH14040, this protective device delivers precise overcurrent interruption to keep single-hot circuits in commercial panels safe and compliant, helping you prevent damage from overloads and short circuits.

Specifications at a glance

• Brand: Square D
• Part Number: EH14040
• Current Rating: 40 A
• Poles: 1
• Voltage Rating: 277 V
• Type: 1-Pole, 277 V Circuit Breaker

Why this breaker matters

277 V circuits are common in commercial lighting and equipment distributions. This 40 A single-pole breaker provides reliable protection for those loads, ensuring that an overload or fault instantly trips the circuit to prevent insulation damage, overheating, and electrical fires. The EH14040 is built to deliver predictable performance in everyday panel configurations where 277 V protection is required.

Ideal uses and scenarios

• Protect 277 V lighting or single-branch circuits in commercial spaces, offices, or warehouses.
• Replacement part for Square D panels that support EH-series 1-pole breakers.
• Situations where a dedicated 40 A protection point is needed for a specific 277 V load without altering adjacent circuits.

Compatibility and installation considerations

Use this part for panels designed to accommodate EH-series 1-pole breakers. Confirm panel compatibility and follow proper electrical safety procedures during installation. If you’re replacing an exhausted breaker or upgrading a circuit to a 40 A limit, this EH14040 provides a straightforward, exact-fit solution for 277 V systems.

For trusted protection of your 277 V circuits, the Square D EH14040 40A 1-Pole 277 V Circuit Breaker combines precise rating with dependable performance, delivering peace of mind for commercial electrical layouts where reliability matters most.