Allen-Bradley 1492-CB1G040 4A 1-Pole 277 V Circuit Breaker

Allen-Bradley 1492-CB1G040 is a compact, single-pole circuit breaker engineered for reliable protection of 277 V circuits. With a precise 4 A rating, this device is purpose-built for safeguarding smaller, single‑phase loads in commercial and light industrial electrical systems. If you’re building or upgrading panels that rely on Allen-Bradley’s 1492-series protection, this breaker provides a seamless, predictable level of protection and easy interchangeability.

Why this 4 A, 1‑pole breaker stands out

• Exact 4 A protection for 277 V circuits: Ideal for limiting overloads on lighting feeders, small control circuits, and other modest loads within commercial buildings.
• 1‑pole design: Delivers focused protection to a single hot conductor, simplifying panel layouts and fault isolation in single‑phase distributions.
• 277 V suitability: Tuned for standard commercial power distribution found in offices, retail spaces, schools, and healthcare facilities that use 277 VAC lighting and equipment.
• Proven Allen-Bradley reliability: Built to perform consistently in demanding environments, with design discipline that aligns with other 1492-series devices for straightforward maintenance and replacement.

Practical use cases you’ll appreciate

• Protect 277 V lighting feeders in large office complexes or hospitality venues, preventing nuisance trips while ensuring safety for wiring and fixtures.
• Guard small 277 V control circuits in building automation, HVAC controller inputs, and fans where a modest current limit helps avoid equipment damage.
• Replace or extend existing protection in panels that accept 1492‑series single‑pole breakers, preserving system compatibility and consistent performance.

What makes it work in real-world installs

• Targeted current protection minimizes the risk of overcurrent damage without overreacting to normal load fluctuations.
• Single-pole simplicity reduces wiring complexity and makes testing and maintenance more straightforward in mixed-commercial environments.
• Compatibility mindset supports modular panel designs, enabling technicians to scale protection as circuits evolve—without overhauling the entire distribution page.

Specifications at a glance

• Part number: 1492-CB1G040
• Current rating: 4 A
• Poles: 1
• Voltage rating: 277 V

Tip for installation and use

When integrating the Allen-Bradley 1492-CB1G040 into an existing panel, verify that the enclosure and bus configuration support 1492-series single‑pole breakers. Follow standard electrical safety practices, refer to your control panel’s installation guide for torque and wiring instructions, and ensure the protected load stays within the 4 A rating to maintain safe, reliable operation.