Siemens Q2125BH - 125 A, 240 V, 2-Pole Plug-In Circuit Breaker | AmpState

The Siemens Q2125BH is a 125A, 240V, 2-pole plug-in molded case circuit breaker designed to deliver reliable branch circuit protection in panelboards and load centers. Its fast plug-in connection streamlines installation and replacements, helping you minimize downtime during panel upgrades or servicing.

Key benefits

• Quick, tool-free plug-in installation: The fast plug-in connection enables rapid seating in compatible Siemens panelboards and load centers, reducing installation time and service interruptions.
• Thermal-magnetic protection: A dual-trip design combines a thermal element for stable overload protection with a magnetic mechanism for instantaneous short-circuit response, helping prevent damage to wiring and equipment.
• OEM-panelboard compatibility: Engineered to pair with matching Siemens panelboards and load centers, ensuring proper fit, alignment, and consistent trip characteristics.
• Versatile for multiple environments: Ideal for residential, commercial, and light industrial applications where dependable 2-pole protection is required.

Specifications at a glance

• Manufacturer: Siemens
• Part Number: Q2125BH
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 125 A
• Voltage Rating: 240 V
• Poles: 2
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• Protecting branch circuits in main service panels or subpanels where a 125A feed is required.
• Retrofit or upgrade projects in homes, small offices, retail spaces, or light manufacturing facilities needing rapid, secure replacements.
• Environments where downtime matters—the plug-in design allows quick swap-outs during maintenance without extensive wiring work.

Installation & compatibility tips

• Ensure your panelboard or load center is a compatible Siemens model designed for plug-in MCCBs to guarantee proper seating and trip coordination.
• Verify the circuit’s load and fault-current requirements align with the 125 A, 240 V rating to maintain safe and effective protection.
• When replacing an existing breaker, confirm the Q2125BH matches the panel’s intended trip characteristics and physical dimensions to avoid fitment issues.