QR22B125 - 125 Amp Circuit Breaker

QR22B125 - 125 Amp Circuit Breaker

Engineered for dependable overcurrent protection in commercial and industrial systems, the Siemens QR22B125 is a 2-pole, 125-amp thermal-magnetic circuit breaker rated for 240V AC. With a 10 kA interrupting capacity, this unit can safely interrupt fault currents under demanding conditions. Its compact QR‑frame design is built for flexibility: load-side lugs come standard, while line-side lugs may be added in the field to suit your layout. The bolt-on mounting style simplifies installation into load centers, panelboards, switchgear, and control panels. Calibrated for a 40 °C ambient environment, it’s designed to deliver performance across a wide range of installation settings without compromising protection.

Key Features and Benefits

• Thermal‑Magnetic Trip Mechanism: Provides both long‑time (overload) and instantaneous (short‑circuit) protection in one integrated device.
• High Interrupting Capacity (10 kA @ 240 V): Offers robust fault current interruption for safer system operation.
• Flexible Configuration: Equipped with load-side lugs; line-side lugs can be field-installed, enabling adaptable wiring layouts.
• Space-Efficient QR Frame: Optimized for compact panel and switchboard designs without sacrificing electrical capacity.
• Accessory Compatibility: Supports internal add-ons, such as shunt trips and auxiliary switches, to enhance control, signaling, or remote trip capability.
• Push-to-Trip Feature: Allows manual testing of the trip mechanism for diagnostics and maintenance (common among QR series)

Technical Specifications

• Voltage Rating: 240 V AC (phase-to-phase)
• Current Rating: 125 A
• Interrupting Capacity: 10 kA at 240 V AC
• Number of Poles: 2 (dual pole)
• Trip Type: Thermal‑Magnetic
• Mounting Style: Bolt-on (fixed mounting)
• Terminal Configuration: Load-side lugs installed; line-side lugs not installed (field‑installable)
• Ambient Calibration: 40 °C nominal
• Approx. Dimensions: ~7.0 in × 3.0 in × 3.4 in (H × W × D) – per Siemens spec sheet
• Weight: ~3.2 lbs

Material Compliance and Certifications

• Certifications: Certified to UL 489, CSA C22.2, and NOM‑003 standards—ensuring recognition in U.S., Canadian, and Mexican markets.
• Accessory Listings: Field installable accessories (shunt trips, aux switches) are UL‑listed for internal use in this QR frame design.
• RoHS Compliance: not explicitly listed
• REACH / SVHC Status: no high‑concern substances reported in available datasheets

Where It Works Best

• This breaker is ideal for projects where reliable circuit protection is critical but space is limited—such as compact panelboards, industrial distribution panels, or retrofits in control enclosures. It’s beneficial in environments with moderate ambient temperatures (calibrated at 40 °C). You’ll often see it in commercial or light industrial settings: load centers, switchboards, control panels, meter centers, and OEM installations. Its flexibility to accept optional internal accessories makes it a strong choice if you later need remote trip, signaling, or auxiliary monitoring without replacing the entire unit.