Square D FA321001021 100A 3-Pole 240 V Circuit Breaker Potential Transformer

Meet the Square D FA321001021 100A 3-Pole 240 V Circuit Breaker Potential Transformer—designed to deliver precise protection and streamlined monitoring for your 3‑phase electrical systems. This device combines a robust 100 A circuit breaker with a potential transformer interface, making it a practical choice for industrial and commercial panels that require accurate electrical sensing alongside reliable overcurrent protection.

Key specifications at a glance

• Current rating: 100 A
• Poles: 3
• Voltage rating: 240 V
• Part number: FA321001021
• Brand: Square D

Why this 3-pole design matters

• Protects all three phases simultaneously, preventing imbalances that can damage motors, drives, and other 3-phase equipment.
• Ideal for 3‑phase distribution in commercial and light industrial environments where reliable trip coordination is crucial.
• Built to integrate with standard Square D panels and compatible protection relays, simplifying installation and maintenance.

Potential Transformer integration for smarter protection

• Includes a potential transformer interface to support accurate voltage and current sensing, enabling better metering, monitoring, and relay coordination within your protection scheme.
• Helps facilities track load conditions and detect anomalies before they impact uptime, improving overall system reliability.

Ideal applications

• 3‑phase motor circuits (pumps, compressors, conveyors) up to 100 A
• HVAC distribution, processing equipment, and other 3‑phase loads in commercial settings
• Panel boards and electrical rooms where precise protection and monitoring are required

What sets it apart from alternatives

• Unified protection and sensing solution tailored for Square D ecosystems, reducing parts complexity and improving compatibility.
• Three-phase coordination that minimizes nuisance trips and supports reliable equipment operation in dynamic load environments.
• Designed for straightforward integration with protective relays and metering setups, helping you build a more observant electrical distribution system.

Practical tips for deployment

• Verify compatibility with your existing Square D panels and labeling to ensure a seamless fit.
• Plan for proper wiring topology to maintain clean phase-to-neutral and phase-to-ground paths, maximizing protection effectiveness.
• Pair with appropriate protection relays and metering equipment to leverage the potential transformer interface for enhanced visibility.

In environments where reliable 3‑phase protection and accurate electrical monitoring are non‑negotiable, the Square D FA321001021 100A 3-Pole 240 V Circuit Breaker Potential Transformer offers a focused, compatible solution. Add this trusted component to your electrical distribution strategy and safeguard critical loads with confidence.