Square D FHB36100 100A 3-Pole 600 V Circuit Breaker Potential Transformer

The Square D FHB36100 is a robust three‑phase protective solution engineered for reliable, high‑demand electrical systems. Rated at 100 A with three poles and a 600 V maximum, this circuit breaker combines dependable overcurrent protection with seamless compatibility within Square D/SCHNEIDER ELECTRIC panels and switchgear. Part of Square D’s trusted lineup, it’s designed to deliver consistent trip performance when overloads or short circuits occur, helping keep critical equipment protected and uptime high.

• Three-pole protection provides synchronized safeguarding across all phases, simplifying wiring and coordination in distribution panels and motor control centers.
• 100 A current rating suits main feeders and medium‑sized branch circuits, delivering reliable protection without unnecessary nuisance trips.
• 600 V voltage rating supports common industrial power distributions, enabling safe operation across diverse installations.
• Potential transformer compatibility designed for use with metering and protective relay signaling, allowing accurate current sensing and integration with monitoring systems for improved power quality and protection coordination.
• Ease of integration – engineered to plug into compatible Square D enclosures and bus configurations, reducing installation complexity and ensuring consistent performance within planned electrical layouts.
• Durable, field‑reliable design backed by Square D’s engineering standards and global support network, giving teams confidence in long‑term reliability in demanding environments.

Ideal use cases

This 100 A, 3‑pole, 600 V circuit breaker is well suited for industrial and commercial facilities that rely on balanced three‑phase power. Use it as a main feeder breaker in distribution panels, as a protective device for motor feeders and transformers, or in retrofits where a compatible 3‑phase breaker is required. Its potential transformer compatibility makes it a practical choice for facilities employing metering, power quality monitoring, or relay signaling to support smarter protection schemes.

Why choose this Square D solution

Choosing the FHB36100 means selecting a component designed for dependable protection within a standardized Square D ecosystem. The parts’ three‑pole architecture, solid 100 A rating, and 600 V capability align with common industrial requirements, while the potential transformer compatibility enables integrated metering and relay coordination—streamlining both installation and ongoing power management. For teams already invested in Schneider Electric products, this breaker delivers proven interoperability and a familiar maintenance pathway.

Practical notes for install and optimization

• Confirm that the system voltage and fault current levels fall within the 600 V rating to ensure safe operation.
• For metering or relay applications, wire the compatible potential transformer connections per the facility’s protection scheme to enable accurate monitoring and signaling.
• Coordinate protection settings with upstream devices to achieve selective tripping and minimize disruption during faults.
• Ensure the replacement is installed in a compatible Square D panel or enclosure to maintain electrical integrity and warranty considerations.

Specifications at a glance

• Part Number: FHB36100
• Current rating: 100 A
• Poles: 3
• Voltage rating: 600 V
• Type: Circuit breaker with potential transformer compatibility for metering/relay signaling