General Electrics MB423 - 100 A, 3-Pole Plug-In Circuit Breaker | AmpState

The General Electrics MB423 is a dependable 100 A, 3-pole plug-in molded case circuit breaker designed to shield your panelboard or loadcenter from overcurrent and short-circuit events. Built for fast, secure installation and consistent protection, this unit is a smart choice for residential, commercial, and light industrial electrical environments where reliability matters.

Key Benefits

• Fast plug-in connection enables quick installation and effortless replacement, reducing downtime during panel upgrades or fault repairs.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance across varying fault currents, helping to minimize nuisance tripping while safeguarding conductors and devices.
• OEM-ready compatibility designed to pair with matching General Electrics OEM loadcenters and panelboards for a seamless, code-compliant fit.
• Versatile application ideal for branch circuit overcurrent and short-circuit protection in a wide range of building types and configurations.

Technical Snapshot

• Manufacturer: General Electrics
• Part Number: MB423
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 100 A
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal Use Scenarios

• Residential subpanels needing reliable 3-pole protection for three-phase or multi-wire branch circuits
• Commercial lighting, HVAC, and small motor circuits where quick replacement and solid trip performance matter
• Light industrial panels requiring robust plug-in protection that harmonizes with existing OEM panelboards

Compatibility & Installation Guidance

This MB423 is engineered to work with matching General Electrics panelboards and loadcenters. When replacing an existing device, confirm the class and frame size align with the surrounding protection scheme and that the trip characteristics match your system’s fault-current profile. For best results, install with power removed, ensure secure seating in the bus and mounting contacts, and follow manufacturer guidelines for torque and testing after installation.

Practical Insights

• Use MB423 in circuits where a clear, dependable 100 A protection point is required without complicating the panel’s architecture.
• Consider coordination with upstream protection to minimize disruption during faults and optimize selective tripping.
• Store and inventory a like-for-like replacement to expedite maintenance and minimize panel downtime when service is required.