Schneider Electric FJA140505 50A 1-Pole 277 V Circuit Breaker Potential Transformer

Meet the Schneider Electric FJA140505: a 50 A, 1-pole, 277 V circuit breaker with an integrated potential transformer. Engineered for reliability in commercial and industrial panels, this unit combines robust protection with metering-ready sensing in a compact, easy-to-install package.

Key specifications

• Part number: FJA140505
• Current rating: 50 A
• Pole: 1
• Voltage rating: 277 V
• Function: Circuit breaker with integrated potential transformer for sensing and metering

Why this matters

In modern electrical systems, precise current sensing and robust protection are essential. The built-in potential transformer provides a low-voltage signal for metering devices or building management systems without the need for extra components. This simplifies wiring, enhances measurement integrity, and supports accurate energy reporting, demand management, and fault detection across your 277 V infrastructure.

Ideal use cases

• 277 V lighting distribution and small-to-midsize loads in commercial environments
• Panelboard protection that benefits from integrated sensing for energy meters or BMS integration
• New installs or retrofits where compact wiring and streamlined metering are priorities

What to expect with installation

Designed to fit standard Schneider Electric panel configurations, the FJA140505 integrates smoothly into appropriate 277 V systems. Confirm compatibility with your panelboard and ensure the connected load remains within the 50 A rating. The integrated transformer enables metering-ready signaling directly from the breaker, reducing external components and wiring complexity.

Competitive advantages

This model stands out by marrying protection and monitoring in a single device. By cutting down extra cabling and potential points of failure, it accelerates commissioning for energy monitoring projects and simplifies ongoing facilities management.

Practical tips

• Pair with compatible energy meters or BMS interfaces that accept the transformer's low-voltage output for accurate monitoring.
• Incorporate routine preventive maintenance for both the breaker and transformer connections to ensure consistent performance.
• Follow manufacturer torque specifications for line and load terminals to maintain reliable operation at the 50 A rating.