Square D FC34100 Circuit Breaker | 100A 3-Pole 480V I-Line Plug-In

Square D FC34100 — 100 Amp 3-Pole Molded Case Circuit Breaker

The Square D FC34100 is a heavy-duty molded case circuit breaker (MCCB) engineered for reliable overcurrent protection in commercial and industrial power distribution systems. With a 100-amp continuous rating, 3-pole configuration, and 480V AC voltage rating, this breaker is a trusted solution for protecting motors, panels, and critical electrical equipment.

Designed for use with Square D I-Line switchboards and panelboards, the FC34100 features a plug-in connection type that simplifies installation and replacement without the need for field wiring modifications. Its compact frame and rugged construction meet the demands of heavy commercial and light industrial environments.

Key Specifications

• Part Number: FC34100
• Brand: Square D (Schneider Electric)
• Type: Molded Case Circuit Breaker (MCCB)
• Style: I-Line Plug-In
• Amperage: 100A (100 Amps)
• Number of Poles: 3-Pole
• Voltage Rating: 480V AC (480VAC)
• Interrupting Rating: 65kAIC at 480V
• Trip Function: LI — Long-Time and Instantaneous
• Trip Type: Thermal Magnetic
• Connection Type: I-Line Style Plug-In

What Is an I-Line Style Plug-In Circuit Breaker?

An I-Line style plug-in circuit breaker is designed specifically for Square D I-Line panelboards and switchboards. Unlike standard bolt-on breakers, I-Line breakers slide into position and connect through a built-in stab-on mechanism, enabling faster installation, cleaner wiring, and easy field replacement — a major advantage in industrial maintenance environments.

Why Choose the Square D FC34100?

• Proven Performance: Thermal magnetic trip technology ensures accurate, responsive protection against overloads and short circuits
• 65kAIC Interrupting Capacity: Handles high-fault currents common in 480V industrial systems
• I-Line Compatibility: Drop-in replacement for any Square D I-Line panelboard — no rewiring required
• 3-Pole Design: Ideal for three-phase loads including motors, HVAC equipment, and industrial machinery
• UL Listed: Meets North American safety and performance standards

Common Applications

• Industrial motor control centers (MCC)
• Commercial and industrial panelboards
• HVAC and mechanical equipment protection
• Manufacturing and process equipment
• Square D I-Line switchboard systems

Available Conditions

This product is available in New and Used/Tested condition. All used units are inspected and tested before shipment to ensure full functionality and compliance with original specifications.

Frequently Asked Questions

What does FC34100 mean?
The FC34100 model number indicates: FC = I-Line frame, 3 = 3-pole, 4 = 480V class, 100 = 100-amp rating. It is part of Square D's FC-frame breaker line manufactured by Schneider Electric.

Is the Square D FC34100 still available?
Yes. The FC34100 is available new from authorized distributors and as tested surplus stock. It remains compatible with Square D I-Line panelboard systems still in active service.

Can the FC34100 be used as a direct replacement?
Yes. The FC34100 is a direct plug-in replacement for any Square D I-Line panelboard accepting a 100A, 3-pole, 480V breaker with I-Line connection style.

What is the interrupting rating of the FC34100?
The FC34100 has an interrupting rating of 65,000 AIC (65kAIC) at 480V AC, suitable for most commercial and industrial distribution systems.