General Electrics THJK636400 - 400 A, 3-Pole Bolt-On Circuit Breaker | AmpState

The General Electrics THJK636400 is a robust 400 A, 3-pole bolt-on molded case circuit breaker designed to guard panelboards and loadcenters from overcurrent and short circuits. Built for demanding electrical environments, this breaker delivers reliable protection where three-phase power distribution matters most.

Key benefits that matter in the field

• Secure bolt-on mounting provides a rigid, vibration-resistant connection to the bus, reducing the risk of loosening that can compromise protection and performance.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining a thermal overload element with a magnetic short-circuit mechanism for fast, decisive interruption when needed.
• OEM-compatible design is crafted to fit matching GE panelboards and loadcenters, ensuring proper fit, coordination, and reliable operation within existing electrical systems.
• 3-pole configuration is ideal for 3-phase applications, delivering coordinated protection across all phases in commercial and light industrial setups.

Ideal applications

• Residential, commercial, and light industrial panelboards and loadcenters requiring dependable three-phase protection
• Branch circuit protection for feeders and distribution circuits where a 400 A rating is appropriate
• Replacement or upgrade within GE-compatible equipment to maintain system coordination and protection

Technical snapshot

• Manufacturer: General Electrics
• Part Number: THJK636400
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400 A
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why this matters for you

When you’re configuring a panel for reliable power distribution, the THJK636400 offers more than just protection—it's a durable, installation-friendly solution that aligns with GE’s panel ecosystems. The bolt-on design simplifies mounting and bus connections, while the thermal-magnetic trip mechanism provides predictable behavior under overloads and fast disconnection during faults. This means fewer unexpected trips, quicker fault clearance, and safer, more stable operation for critical loads in homes, offices, and light industrial facilities.

Installation and maintenance tips

• Install in accordance with local electrical codes and GE installation guidelines to ensure proper fit and performance.
• Ensure the bus connection is clean and undamaged before mounting; use the designated bolt-on hardware to achieve a solid, vibration-resistant bond.
• Periodically inspect for signs of overheating or discoloration around the breaker and panel connections; address any issues promptly to maintain protection integrity.
• Pair this 400 A, 3-pole unit with compatible GE panels to maintain proper coordination with upstream protective devices.

With its combination of secure mounting, reliable thermal-magnetic protection, and OEM compatibility, the General Electrics THJK636400 is a purpose-built choice for safeguarding critical circuits in a wide range of residential, commercial, and light industrial environments.