General Electrics THKMA836400 - 400 A, 3-Pole Bolt-On Circuit Breaker | AmpState

General Electrics THKMA836400 is a 400A, 3-pole bolt-on molded case circuit breaker engineered for dependable branch-circuit protection in panelboards and loadcenters. This unit is built to handle demanding circuits in a way that keeps electrical systems safe and responsive.

Secure bolt-on mounting delivers a rigid, vibration-resistant bus connection. In environments with frequent equipment activity or mechanical vibration, this mounting design maintains consistent electrical contact and reduces the risk of loose connections that can lead to faults or nuisance trips.

Thermal-magnetic trip unit provides stable, repeatable protection across varying temperatures and loading conditions. The combination of thermal (overload) and magnetic (short-circuit) sensing helps prevent unnecessary trips while delivering rapid response to dangerous fault currents—helping protect wiring, devices, and downstream equipment.

OEM-ready compatibility is designed to fit matching General Electrics OEM loadcenters and panelboards, ensuring a reliable fit and predictable performance when you’re expanding or upgrading an existing installation.

Ideal applications include residential, commercial, and light industrial environments where three-phase protection and robust branch-circuit safeguarding are essential. It’s well-suited for feeders and main distribution paths in service panels, equipment rooms, and low-/mid-rise facilities.

Key specifications at a glance

• Amperage rating: 400A
• Poles: 3
• Mounting style: Bolt-on
• Type: Thermal-magnetic molded case circuit breaker
• Part number: THKMA836400

Why choose the THKMA836400 in your panel

When your installation demands reliable three-phase protection with a solid mechanical connection, this bolt-on breaker delivers. The 3-pole design ensures synchronized switching across all phases, which is especially important in commercial and light-industrial panels where even a small mismatch can affect equipment performance. By pairing the THKMA836400 with the appropriate GE loadcenter or panelboard, you gain a cohesive protection scheme that reduces integration friction and supports long-term serviceability.

Use-case scenarios and practical tips

• Upgrading a service panel in a small commercial building that requires a strong 400A three-phase protection path for feeders and main distribution circuits.
• Expanding a residential or light-industrial panel where a dedicated 400A protection path is needed for high-load equipment or large motors connected through a three-pole circuit.
• Replacing aging or incompatible breakers in compatible GE panelboards to restore reliable fault protection without altering downstream wiring.

Choosing a breaker with a secure bolt-on mount, a thermal-magnetic trip unit, and OEM compatibility helps you build a safer, more reliable electrical backbone. The THKMA836400 is purpose-built for dependable protection where it matters most—configurable, robust, and ready to integrate with GE loadcenters and panelboards.