GE THJK436400 - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Meet the GE THJK436400—a 400A, 600V, 3-pole molded case circuit breaker engineered for dependable branch circuit protection in panelboards and load centers. This unit combines high-current capability with space-smart design, delivering robust protection where it matters most while helping you maximize panel usability.

• Compact molded-case design frees up valuable panel space, making wiring and organization easier in both new installations and upgrades.
• Thermal-magnetic trip unit provides stable, repeatable protection by detecting both sustained overcurrent and short-circuit conditions, reducing nuisance trips while preserving safety.
• OEM-load-center compatibility is engineered to pair with matching GE panels and panelboards, ensuring precise fit, consistent trip characteristics, and fewer installation surprises.
• Versatile application suitable for residential, commercial, and light industrial electrical systems requiring reliable, high-current protection.

• Manufacturer: GE
• Part Number: THJK436400
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400A
• Voltage Rating: 600V
• Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

In real-world installations, you need protection that you can trust when loads rise or faults occur. The GE THJK436400 is designed to isolate faulty circuits quickly while continuing normal operation on healthy ones. The thermal-magnetic mechanism balances fast fault interruption with resistance to normal startup surges, helping to prevent unnecessary outages during operations like elevator startups, HVAC commutations, or motor inrush in commercial spaces.

Ideal for scenarios such as:

• New or retrofit panelboards requiring 3-pole, 400A protection for three-phase distribution
• Residential service upgrades where high-current protection is needed without expanding panel size
• Light industrial applications with compact spacing demands and reliable fault isolation

Installation and compatibility are straightforward when paired with GE OEM panels. This alignment ensures predictable performance, minimizes misfit risks, and supports a streamlined maintenance routine. Follow standard safety practices and refer to your panel’s installation guidelines to confirm proper mounting and electrical connections.

Choosing GE means leaning on proven reliability and thoughtful design. The THJK436400’s combination of high current capacity, compact form, and OEM-grade compatibility translates to fewer compromise points during installation and more dependable protection over the life of the system. For contractors and facility managers who value precise fit and consistent protection in demanding environments, this 3-pole molded case breaker is a practical, future-ready choice.