Eaton 503B027H01 125A 3-Pole 480 V Circuit Breaker Potential Transformer

Meet the Eaton 503B027H01, a rugged 125A three-pole circuit breaker engineered for 480V three-phase systems, with an integrated potential transformer for streamlined protection and accurate metering in one compact unit.

Key specifications

• Part number: 503B027H01
• Current rating: 125 A
• Poles: 3
• Voltage rating: 480 V
• Integrated potential transformer for monitoring and metering

What makes this Eaton circuit breaker with potential transformer stand out

This unit combines robust overcurrent protection with an embedded potential transformer, eliminating the need for a separate transformer in many installations. The result is faster installation, reduced wiring complexity, and a cleaner control panel footprint. With a three-pole design, it provides balanced protection across all phases, helping prevent nuisance tripping and enabling precise coordination in your power distribution scheme.

Ideal applications

• Industrial facilities deploying 480V three-phase distributions that require reliable protection and real-time voltage sensing
• Data centers and critical environments where integrated monitoring supports power quality analysis and energy management
• Manufacturing lines and heavy machinery lines needing compact, space-saving protection with built-in measurement capabilities

Performance and protection benefits

• 125 A rating delivers dependable feeder protection for moderately large circuits
• Three-pole configuration ensures synchronized shutdown across all phases
• Embedded potential transformer enables voltage sensing and data collection for remote monitoring systems

Practical installation and use

Designed for integration into standard industrial panels that support 480V three-phase systems, the 503B027H01 helps streamline panel layout and diagnostic workflows. When wiring, ensure compatibility with your panel’s footprint and follow established torque and safety guidelines for circuit breakers to maintain optimal performance.

Care, maintenance, and tips

• Periodically inspect terminations and insulation for signs of wear or overheating
• Incorporate the unit into your regular preventative maintenance schedule to verify both protection and metering outputs

With the Eaton 503B027H01, you get reliable three-pole protection at 480V paired with integrated measurement capabilities, delivering a streamlined, space-efficient solution for advanced power distribution and monitoring in demanding environments.