General Electric | MB123 | Circuit Breaker | 150A | 3-Pole | 480V | Plug-In

Meet the General Electric MB123 Circuit Breaker — a plug-in, 3-pole protection solution built for 480V three-phase systems. Designed for maintenance, retrofit, and replacement, this breaker helps you keep critical electrical infrastructure running with minimal downtime and precise compatibility.

Key specifications

• Amperage: 150A
• Poles: 3-Pole
• Voltage: 480V
• Plug-In: Yes

Why this MB123 matters for your installation

• Fast, straightforward swaps in compatible GE panels thanks to the plug-in design — ideal when downtime is costly.
• Strong alignment with three-phase, 480V service environments, providing dependable overcurrent protection for mid-to-large electrical feeders.
• Part number MB123 as the primary compatibility reference, ensuring you’re selecting the exact model for your panel configuration.

Ideal use cases

• Routine maintenance on GE switchgear and distribution panels that require a 150A, 3-pole, 480V plug-in breaker.
• Retrofits where a like-for-like replacement is needed to restore original protection characteristics.
• Repairs after a fault or nuisance tripping that necessitates swapping to a trusted, GE-branded component.

Important compatibility notes

The part number MB123 is your best compatibility reference. Before ordering, confirm that your panel is designed for a 3-pole, 480V plug-in breaker with the same form factor. Using the MB123 in panels outside of this specification can compromise protection and performance.

Installation and safety tips

• Always de-energize and lock out the circuit before attempting installation or replacement.
• Verify voltage, pole configuration, and panel compatibility against the MB123 specifications.
• Follow best practices for electrical work and consult a licensed electrician if you’re unsure about panel compatibility or safe handling.

Upgrade or replace with confidence using the General Electric MB123 Circuit Breaker — a precise, purpose-built solution for 150A, 3-Pole, 480V plug-in protection in your GE panel ecosystem.