General Electric | THJK436400LL | Circuit Breaker | 400A | 3-Pole | 600V

General Electric THJK436400LL Circuit Breaker — a purpose-built, high-current defender for three-phase 600V applications. This 400A, 3-pole breaker is designed for maintenance, retrofit, and replacement projects where exact GE compatibility matters most, helping maintain safety, reliability, and uptime in demanding electrical environments.

Key specifications

• Amperage: 400 A
• Poles: 3-Pole
• Voltage rating: 600 V
• Part number: THJK436400LL

Why this GE breaker stands out

The THJK436400LL is a genuine GE replacement part, not a generic substitute. It’s engineered to integrate seamlessly with GE panelboards and distribution gear, preserving protective coordination and electrical characteristics specific to GE systems. Using the exact part number minimizes compatibility risk and streamlines procurement for service contractors and facilities teams.

Ideal use cases

• Replacing a failed GE circuit breaker in an existing GE panel with matching rating.
• Upgrading or retrofitting three-phase feeders in 600V systems where a rugged, single-pole protection device is required for each phase.
• Maintaining code-compliant protection in commercial or industrial installations during refurbishments or capacity upgrades.

Practical installation and compatibility tips

• Always verify fit against the panel label and GE's part catalog by using the exact part number THJK436400LL.
• Confirm that the system’s voltage and current requirements align with 600V and 400A ratings before purchase.
• For critical or large-scale installations, involve a licensed electrician to ensure correct protective coordination, wiring terminations, and safety compliance.

With its GE-originated design and 3-pole configuration, the THJK436400LL delivers dependable protection for 3-phase circuits at 600 volts, helping facilities keep power systems safe, compliant, and performing at their best.