GE MB423 - 100A, 277VAC, 3-Pole, Circuit Breaker

GE MB423 — a rugged 3-pole circuit breaker designed to protect three-phase systems in demanding electrical environments. Rated at 100A and up to 277V, this device delivers precise overcurrent protection where it matters most, in panelboards, switchboards, and control panels.

Key features that matter in real-world use:

• Three-pole configuration supports balanced protection across all phases in 3-phase systems, helping prevent phase unbalance and equipment damage.
• 277VAC rating is ideal for commercial lighting circuits and three-phase motor loads commonly found in offices, retail, and light industrial settings.
• Rugged design suited for industrial, commercial, and OEM applications where dependable protection and safe operation are critical in distribution panels and motor control centers.
• Compact form factor and straightforward installation for panelboards, switchboards, and control panels, reducing wiring complexity and space requirements.

Ideal applications

• Panelboards and switchboards in commercial buildings with 277V lighting and 3-phase distribution.
• Motor control centers and industrial control panels requiring coordinated protection across all three phases.
• OEM equipment where reliable overcurrent protection is part of the essential safety and performance package.

Specifications at a glance

• Current rating: 100A
• Voltage rating: 277VAC
• Poles: 3-Pole
• Breaker type: Circuit Breaker

Practical considerations and best practices:

• Plan for future load growth by pairing the MB423 with compatible feeders and bus configurations in your distribution scheme.
• Ensure correct mounting orientation and wiring according to GE installation guidelines to maximize performance and longevity.
• In environments with frequent inrush or motor starting, consider coordination with upstream protection devices to optimize selectivity and minimize nuisance trips.

With the GE MB423, you gain a trusted, purpose-built solution for safeguarding three-phase electrical systems, reducing unplanned downtime, and protecting critical equipment in both new installations and service upgrades.