Siemens QRH22B125 - 125 A, 240 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Siemens QRH22B125 is a 2-pole bolt-on molded case circuit breaker rated at 125 A and 240 V, purpose-built to deliver reliable branch-circuit protection in panelboards and load centers. Its rugged design and precise protection features make it a dependable choice for residential, commercial, and light industrial electrical systems.

Why this breaker stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection that stays solid under real-world conditions, reducing movement-related wear and potential faults.
• Thermal-magnetic trip unit delivers stable, repeatable protection by responding to both sustained overloads and sudden short circuits, helping to prevent damage to conductors and downstream devices.
• OEM-compatible design is built to fit with matching Siemens OEM load centers and panelboards, simplifying replacements and upgrades without fit issues.
• Versatile for multiple environments suitable for residential service panels, commercial distribution, and light industrial circuits that require dependable 125 A protection at 240 V.

Ideal use cases and scenarios

• Upgrading or replacing circuit breakers in existing Siemens panelboards to maintain consistent protection across the system.
• Protecting branch circuits serving HVAC equipment, motors, lighting, and other 240 V loads in small-to-mid-scale installations.
• Integrating into new builds where a robust, bolt-on solution is preferred for improved mechanical stability in vibration-prone environments.

Technical snapshot

• Manufacturer: Siemens
• Part Number: QRH22B125
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 125 A
• Voltage Rating: 240 V
• Number of Poles: 2
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Installation and compatibility guidance

This unit is designed to work with matching OEM Siemens load centers and panelboards. For optimal performance, ensure the enclosure and conductors are rated for 240 V and 125 A, and follow Siemens installation guidelines for bolt-on breakers to achieve a secure, vibration-resistant connection.