GE TJK436Y400 - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

GE TJK436Y400 is a robust 400A, 600V, 3-pole molded case circuit breaker designed to deliver dependable branch circuit protection in panelboards and loadcenters. Its compact footprint optimizes panel space without sacrificing protection performance, making it a practical choice for demanding electrical distributions in residential, commercial, and light industrial environments.

Why this breaker stands out

• Compact molded case design maximizes available space in crowded panels, helping you fit high-capacity protection where it matters.
• Thermal-magnetic trip unit provides stable overload protection with an instantaneous magnetic trip for short circuits, delivering repeatable, predictable protection across a wide range of fault conditions.
• OEM-compatible performance engineered to work with matching GE OEM load centers and panelboards, ensuring proper fit, coordinated protection, and reliable operation.
• Versatile application ideal for residential, commercial, and light industrial circuit protection, especially where a three-phase main or feeder breaker is needed.

Technical specifications at a glance

• Manufacturer: GE
• Part Number: TJK436Y400
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400A
• Voltage Rating: 600V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• Main or feeder protection in three-phase panelboards and load centers for commercial spaces, office buildings, and light industrial facilities.
• Replacement or upgrade in existing GE OEM panels to restore reliable current coordination and short-circuit safeguarding.
• New installations where a compact, high-capacity breaker is required without expanding panel width.

What problems this delivers—and how it compares

Stronger protection that combines dependable overload control with fast short-circuit interruption means less downtime and fewer repaired components downstream. The thermal element guards against nuisance trips due to normal heat fluctuations, while the magnetic element responds to high-energy faults, helping protect wiring, components, and connected load. This is a practical alternative to smaller or purely magnetic breakers when a 400A capacity is needed within a compact form factor, ensuring correct trip characteristics and panel coordination.

Practical insights for installation and longevity

• Confirm panelboard compatibility with GE OEM frames to ensure proper bus alignment and labeling.
• Adhere to manufacturer torque guidelines for lugs and termination to maintain secure connections and safe operation.
• Use as a reliable main feeder or large branch circuit protector in systems requiring robust fault isolation and rapid recovery once faults are cleared.

Designed for engineers, electricians, and facility managers who demand dependable, long-lasting protection in critical electrical enclosures, the GE TJK436Y400 delivers precise protection where your panels live and work hardest. Add this 400A, 600V, 3-pole molded case circuit breaker to your panel upgrade or replacement project and experience consistent performance across residential, commercial, and light industrial applications.