QR23B125 - 125 Amp Circuit Breaker

QR23B125 - 125 Amp Circuit Breaker

Built to deliver dependable protection and peace of mind, the Siemens QR23B125 molded case circuit breaker is engineered for systems operating at 240 VAC that demand consistent, precise overload and short-circuit control. With a 125-amp rating, 10,000 A interrupting capacity (AIC), and a three-pole configuration, this breaker is ideal for heavier commercial, industrial, and mission-critical residential installations. It’s compact (7.0 inches tall), weighs just 4.5 lb, mounts cleanly, and holds HACR approval so it can handle HVAC loads in addition to general panel protection.

Key Features and Benefits

• Dependable protection: Guards circuits up to 240 VAC, responding quickly to overloads and short circuits
• Three-pole design: Offers balanced control across three phases, perfect for three-phase systems
• High interrupting capacity: Rated for 10k AIC to handle fault surges without damage
• HACR approved: Suitable for use with heating, air conditioning, and refrigeration equipment
• Easy to wire: Includes load-side lugs for simplified installation
• Compact and lightweight: Only 7.0″ tall and 4.5 lb, minimizing panel footprint
• Built to last: Constructed from quality materials that meet electrical industry standards

Technical Specifications

• Manufacturer: Siemens
  
• Model / Part Number: QR23B125
  
• Frame Type: QR2
  
• Poles: 3
  
• Amperage: 125 A
  
• Voltage Rating: 240 VAC
  
• Interrupt Rating (AIC): 10,000 A
  
• Height: 7.0 in
  
• Weight: 4.5 lb
  
• Temperature Rating: 40 °C
  
• Construction: Molded case, load-side lugs included
  

Material Compliance and Certifications

• Quality materials: Conforming to electrical safety and performance standards
• HACR compliance: Ensures reliable operation in HVAC, refrigeration, and general power circuits
• Meets recognized standards: Tested and certified as part of Siemens’ QR series

Where It Works Best

• This circuit breaker shines in installations where dependable 125-amp protection is required on a 240 V three-phase system. Use it in:
• Commercial or industrial service panels
• HVAC, refrigeration, or heating systems
• Workshop or facility power distributions
• Multi-unit or mixed load applications needing a three-pole breaker