GE TJK4K - 400 A, 600 V Bolt-On Circuit Breaker | AmpState

Meet the GE TJK4K 400A, 600V bolt-on molded case circuit breaker from AmpState. Designed to anchor panelboards and loadcenters, this unit delivers precise branch circuit overcurrent and short-circuit protection across residential, commercial, and light industrial environments. The secure bolt-on mounting creates a rigid, vibration-resistant bus connection, so you’re less likely to experience loose connections or nuisance trips in challenging installation conditions.

• Secure bolt-on mounting: Provides a rigid, vibration-resistant bus connection that stays tight through temperature changes and equipment movement.
• Thermal-magnetic trip unit: Combines thermal overload sensing with instantaneous magnetic trip for predictable, fast responses to short circuits and sustained overloads.
• OEM-compatible: Engineered to pair with matching GE OEM loadcenters and panelboards for straightforward installation and dependable performance.
• High-current, high-voltage protection: 400A rating at 600V supports large feeders and demanding circuits without compromising safety.
• Versatile application: Ideal for residential service upgrades, commercial distribution panels, and light industrial circuits requiring robust protection.

Ideal use scenarios

Use the GE TJK4K to protect heavy-load branch circuits, feeders feeding subpanels, or critical equipment in spaces like office suites, small warehouses, or multi-residential units. Its bolt-on design and thermal-magnetic trip behavior deliver consistent protection where panel integrity and reliable trip performance matter most.

Technical specifications

• Manufacturer: GE
• Part Number: TJK4K
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 400A
• Voltage rating: 600V
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

If you’re upgrading or configuring a new panel system, the GE TJK4K 400A/600V bolt-on breaker offers a reliable, OEM-compatible solution that keeps electrical distributions safe and compliant. Available through AmpState for straightforward ordering and integration with GE panelboards and loadcenters.