QRH22B125 - 125 Amp Circuit Breaker

QRH22B125 - 125 Amp Circuit Breaker

Meet the Siemens QRH22B125—a dependable 2-pole, 125-amp molded case circuit breaker specially designed for 120/240 V systems. With a 25 kA interrupting rating at 240 V, this breaker offers solid protection against overloads and short circuits. Despite its power, it’s surprisingly compact and lightweight (approximately 7 inches tall and 3.2 lbs) — making it easy to mount even in tighter panels. Built with the QRH2 frame and molded-case construction, it’s engineered for long service life. It also includes load-side lugs to simplify wiring in the field. Because it’s HACR-rated (heating, air conditioning, refrigeration), it’s well suited to residential HVAC installations as well as light commercial systems.

Key Features and Benefits

• 125 A current rating & 25 kA interrupting capacity: Handles typical residential and light commercial fault levels with confidence.
• Compact footprint: Minimal size for easier positioning inside panelboards.
• HACR-rated: Safe for HVAC, refrigeration, and heating loads.
• Load-side lugs included: Simplifies field wiring, makes installation faster.
• Thermal-magnetic trip (LI type): Provides both long-time and instantaneous protection for a wide range of loads.
• Bolt-on mounting: Ensures secure panel attachment.
• Durable molded case and QRH2 frame: Built for consistent performance over time.

Technical Specifications

• Poles: 2
  
• Amperage: 125 A
  
• Voltage: 120/240 V AC
  
• Interrupting Rating (AIC): 25 kA at 240 V
  
• Trip Type: Thermal-magnetic (LI)
  
• Connection Type: Bolt-on
  
• Weight: ~3.2 lbs (≈ 3.0 lb listed)
  
• Height: ~7 inches
  
• Frame / Series: QRH2 / QR Series
  

Material Compliance and Certifications

• Industry Standards: This circuit breaker complies with industry standards and safety requirements. It is UL and CSA certified for use in many applications (as with other QR series breakers).
• Calibration: It is calibrated for operation at an ambient of 40 °C, with derating required above that threshold.
• Molded Case Design: The built-in molded case design offers insulation and durability under normal environmental conditions.
• Accessory Support: Because it’s part of Siemens’s QR/QRH2 line, it supports a range of field-installable accessories (auxiliary switches, shunt trips, etc.) to expand its functionality where needed.

Where It Works Best

• If you’re wiring an HVAC circuit, a workshop subpanel, or any branch distribution line that demands both safety and space-efficiency, the QRH22B125 is a smart pick. Its HACR rating means you can confidently deploy it for air conditioning, heating, or refrigeration loads without overthinking compatibility. Its compact size helps in crowded panels or retrofit jobs. From residential utility rooms to light commercial installations — particularly where HVAC gear is present — this breaker can deliver dependable overcurrent protection with ease.