Overview
The Square D FA-36100 is a 3-pole, 100A molded case circuit breaker from Square D, engineered for commercial and industrial power distribution. This I-Line family unit is rated 600V, 3-pole, 3-phase with 18kA@480V AIC and I-Line style plug-in mounting. It utilizes thermal-magnetic trip technology to provide long-time and instantaneous (LI) protection, making it suitable for branch circuit applications in industrial panelboards and switchboards. The FA36100 has been discontinued by the manufacturer, making quality used units essential for maintaining legacy systems still in widespread service across North America.
Key Features
- Designed for I-Line panelboards and switchboards with plug-on mounting style for efficient installation
- Thermal magnetic non-interchangeable trip unit rated at 100 amperes at 40°C
- Load-end lugs for field wiring termination; accepts 12 AWG to 1/0 AWG copper or aluminum wire
- UL-listed and CSA-certified for dependable protection
- Compact F-frame design reduces panel space requirements
- Non-interchangeable trip unit ensures breaker-specific configuration integrity
Technical Specifications
- Catalog Number: FA36100
- Manufacturer: Square D (Schneider Electric)
- Current Rating: 100 Amperes @ 40°C
- Voltage Rating: 600V AC (also supports 240V, 480V per UL/CSA/NOM standards)
- Number of Poles: 3
- Phase: 3-Phase
- Interrupting Rating: 25 kA @ 240V, 18 kA @ 480V, 14 kA @ 600V
- Trip Type: Thermal-Magnetic (LI—Long-Time and Instantaneous)
- Mounting Style: I-Line Plug-On (plug-in)
- Frame Size: F-Frame (Molded Case)
- Dimensions: 4.5″ W × 4.13″ D × 6.0″ H
- Magnetic Hold Current: 900 A
- Magnetic Trip Current: 1700 A
- Certifications: UL, CSA, NOM, CE
- Terminal Connection: Load-end lugs; I-Line plug-on terminal
Typical Applications
The FA-36100 is designed for I-Line panelboards and switchboards and serves as a reliable component for legacy systems. Common installations include:
- Commercial office buildings and retail facilities requiring main and feeder circuit protection
- Industrial plants with 480V/600V distribution systems
- Electrical panels rated for 100A per branch circuit
- Retrofit and replacement projects for existing Square D I-Line panelboards
- Mission-critical facilities where proven, time-tested protection is required
Compatibility & Replacements
Compatible With
- Square D I-Line panelboards (Class 650, 734, 820 series)
- Square D I-Line switchboards
- F-frame molded case circuit breaker slots rated for 100A, 600V
- Existing 3-pole, 100-ampere electrical distribution systems with I-Line architecture
Replaces / Drop-In Replacement For
The FA-36100 directly replaces other Square D FA-series 100A, 3-pole, 600V molded case breakers of F-frame size. Verify your existing breaker part number and specifications with your system integrator before ordering to ensure proper plug-on fit and electrical ratings.
Works With
- I-Line architectural panelboards and switchboards
- Standard electrical distribution systems using thermal-magnetic trip logic
- Auxiliary contact kits and shunt trip accessories (sold separately)
- Field wiring using standard lugged terminations (12 AWG–1/0 AWG copper or aluminum)
