Eaton WMS1C05 5A 1-Pole 277 V Circuit Breaker

The Eaton WMS1C05 5A 1-Pole 277 V Circuit Breaker is a compact, reliable protection device designed to safeguard individual 277-volt circuits in commercial and light industrial electrical systems. With a precise 5-amp rating and a single-pole design, this breaker interrupts fault currents to prevent damage to wiring and connected equipment, while fitting neatly into standard Eaton panels.

Key specifications

• Current rating: 5 A
• Poles: 1
• Voltage rating: 277 V
• Part number: WMS1C05
• Brand: Eaton

This breaker is especially well-suited for 277V lighting circuits, small fans, pumps, or ballast loads commonly found in offices, retail spaces, and warehouses. If you’re upgrading an older panel or refreshing a panel schedule, the WMS1C05 provides reliable, predictable performance for protecting sensitive loads without unnecessary interruptions.

What makes this unit stand out

• Exact 5-amp protection tailored to light-load circuits, helping prevent nuisance trips on modest but important equipment
• Single-pole design minimizes space usage while delivering dependable overcurrent protection in 277V systems
• Backed by Eaton’s long-standing track record in electrical safety and distribution protection
• Specifically engineered for compatibility with Eaton WMS-series panels and configurations

Practical tips and use cases

• Use for dedicated 277V lighting circuits in commercial buildings to keep other circuits running smoothly during maintenance or fault conditions.
• Ideal replacement for worn or trip-prone breakers on compatible Eaton panels, restoring stable protection without changing downstream wiring.
• Label protected loads clearly on the panel to avoid confusion during troubleshooting or inspections.

Whether you’re outfitting a new installation or upgrading an existing Eaton system, the WMS1C05 delivers focused, dependable protection for 277V circuits with a straightforward, dependable design you can trust.