Square D FH36045 I-Line Molded Case Circuit Breaker | 45A 3-Pole 600V

Square D FH36045 — I-Line Plug-In Molded Case Circuit Breaker

The Square D FH36045 is a high-performance, 3-pole thermal magnetic molded case circuit breaker engineered for demanding industrial and commercial power distribution systems. Designed for I-Line Style Plug-In panelboards, this breaker delivers reliable overcurrent protection with a 45-amp rating at 600V AC — backed by Square D's legacy of electrical engineering excellence.

Whether you're upgrading an aging switchboard, replacing a failed breaker, or specifying new equipment for an industrial facility, the FH36045 provides the interrupting capacity, mounting compatibility, and thermal-magnetic protection your system demands.

Key Specifications

• Part Number: FH36045
• Brand: Square D (Schneider Electric)
• Frame Type: FH (I-Line)
• Trip Type: Thermal Magnetic, Non-Interchangeable
• Number of Poles: 3-Pole (3P / 3PH)
• Ampere Rating: 45A at 40°C
• Voltage Rating: 600V AC
• Connection Type: I-Line Style Plug-In
• Trip Functions: Long-Time (L) & Instantaneous (I)
• Terminal Location: Load End Terminals Standard

Interrupting Ratings (AIC)

• 65 kA @ 240 VAC
• 25 kA @ 480 VAC
• 18 kA @ 600 VAC
• 10 kA @ 250 VDC

The FH36045 carries a high interrupting rating, making it suitable for installations with significant available fault current — a critical safety advantage in industrial environments.

Why Choose the Square D FH36045?

✅ I-Line Plug-In Convenience

The I-Line Style Plug-In design enables fast, tool-free installation and removal directly onto Square D I-Line panelboards and switchboards — reducing downtime during maintenance or replacement.

✅ Thermal Magnetic Protection

Combines thermal protection for sustained overloads with magnetic (instantaneous) protection for short-circuit faults — providing dual-layer defense for motors, feeders, and branch circuits.

✅ High Interrupting Capacity

With up to 65 kA interrupting capacity at 240V, the FH36045 is rated for high-fault environments where standard breakers fall short.

✅ Industrial-Grade Reliability

Built by Square D — a Schneider Electric brand with over a century of electrical innovation — the FH36045 is trusted by electricians, engineers, and facility managers worldwide.

Compatible Applications

• Industrial power distribution panels
• Commercial switchboards
• Motor branch circuit protection (HVAC, pumps, compressors)
• Feeder circuit protection in manufacturing facilities
• I-Line panelboard upgrades and retrofits

Frequently Asked Questions

What is the Square D FH36045 used for?

The FH36045 is used to provide overcurrent and short-circuit protection in 3-phase industrial and commercial electrical systems. It plugs directly into Square D I-Line style panelboards and switchboards rated for 600V AC.

What is the interrupting rating of the FH36045?

The FH36045 has a high interrupting rating of 65 kA at 240V, 25 kA at 480V, and 18 kA at 600V AC.

Is the FH36045 compatible with I-Line panelboards?

Yes. The FH36045 features an I-Line Style Plug-In connection, making it directly compatible with Square D I-Line panelboards and switchboards.

What is the ambient temperature rating of the FH36045?

The FH36045 is rated at 40°C ambient temperature, which is standard for most indoor industrial and commercial enclosure environments.

What is the difference between the FH, FA, and HGA Square D breakers?

All three are Square D I-Line plug-in molded case breakers, but they differ in interrupting capacity. The FH frame offers a high interrupting rating (25 kA @ 480V), the FA frame provides a standard interrupting rating (14 kA @ 600V), and the HGA (Powerpact series) provides 35 kA @ 480V for higher fault current applications.