Allen-Bradley 140MG-G8P-C30 30A 3-Pole Circuit Breaker

Meet the Allen-Bradley 140MG-G8P-C30, a 30A, 3-pole bolt-on molded case circuit breaker designed to shield panelboards and load centers from overcurrent and short circuits. Built for environments where vibration is a factor, this unit features a secure bolt-on mounting that delivers a rigid, dependable bus connection, minimizing loosening and contact issues over time.

Its thermal-magnetic trip unit delivers stable, repeatable protection: the thermal element handles sustained overloads with precision, while the magnetic element activates quickly on short circuits, reducing damage risk to downstream wiring and equipment.

Key benefits include:

• Secure bolt-on mounting for a solid, vibration-resilient connection to the bus
• Balanced protection via a thermal-magnetic trip mechanism that adapts to load conditions
• Seamless compatibility with matching OEM load centers and panelboards
• Ideal for residential, commercial, and light industrial applications requiring reliable three-pole protection

Product overview and specs

Manufacturer: Allen-Bradley

Part number: 140MG-G8P-C30

Type: Thermal-magnetic molded case circuit breaker

Amperage rating: 30 A

Poles: 3

Mounting style: Bolt-on

Applications: Branch circuit overcurrent and short-circuit protection in panelboards and load centers

Who this is for

Designed for electrical installers, facilities managers, and maintenance teams seeking durable, code-compliant protection in three-phase distribution systems. This breaker is especially well-suited for panel installations in homes with complex electrical layouts or light commercial environments where reliability and vibration resistance matter.

Why it stands out

• Three-pole configuration provides balanced protection across three phases, helping prevent unbalanced loads
• Bolt-on mounting minimizes movement and arc-related concerns in environments with vibration or motion
• Thermal-magnetic trip offers predictable, fast response to faults, stabilizing system behavior during fault events
• Designed to integrate smoothly with OEM load centers, making stocking, maintenance, and replacements straightforward for Allen-Bradley customers

Practical tips: When replacing or upgrading, confirm panelboard compatibility for bolt-on breakers and ensure OEM alignment. Use proper mounting hardware and torque per panel specifications to maintain bus integrity and trip reliability, ensuring long-term protection for your electrical system.