Allen-Bradley 1492-SP1C040 4A 1P 277V Circuit Breaker | AmpState

The Allen-Bradley 1492-SP1C040 is a purpose-built circuit breaker designed to deliver dependable overcurrent protection in panelboards, load centers, and electrical distribution configurations. With a single pole, 4 A rating and a 277 V operating range, this unit is tailored for dedicated, single-circuit protection on 277-volt systems. It’s an ideal replacement part and a smart spare that helps you keep the BOM aligned to the original part number.

Specifications at a glance

• Manufacturer: Allen-Bradley
• Part Number: 1492-SP1C040
• Product Type: Circuit Breaker
• Amperage: 4 A
• Poles: 1 Pole
• Voltage: 277 V

Why this part stands out

Choosing the 1492-SP1C040 means opting for an OEM-grade component that preserves the original protection scheme of your panel. Replacing with the exact part number ensures consistent trip characteristics, bus compatibility, and labeled protection for critical circuits. Stocking this unit as a spare minimizes downtime when maintenance or repairs are needed, and it helps you maintain BOM integrity across the electrical distribution system.

Ideal use cases

• Replacement projects in aging panelboards and load centers that require 1492-SP1C040 for exact fit and performance.
• Spare part to keep your BOM aligned with the original specification, reducing part-number mismatches during service calls.
• Protection of critical 277 V circuits where a single-pole, 4 A device is the appropriate control element.

Compatibility and installation notes

Designed for 277 V single-pole circuits, the 1492-SP1C040 is suitable for distribution panels that accept 1P, 277 V protection. When selecting this part, confirm that your panel, bus type, and circuit rating align with the 1492-SP1C040 specifications to ensure a clean, reliable replacement.

Available from AmpState, this exact part helps you maintain consistent protection across your electrical distribution network and streamlines maintenance planning with readily available OEM spares. If you’re aligning a repair or upgrade project with the original design, this 1492-SP1C040 delivers dependable performance when it matters most.