Siemens HQR23B125 Circuit Breaker – QR Series – 125A – 3 Pole – 240VAC – Thermal Magnetic – Bolt-On

The Siemens HQR23B125 is a QR Series low-voltage molded case circuit breaker engineered for reliable overload and short-circuit protection in commercial, industrial, and power distribution systems. Rated at 125A and 240VAC, this 3-pole breaker is designed for three-phase applications requiring consistent performance and high interrupting capacity.

Featuring a thermal-magnetic trip unit with Long-Time and Instantaneous (LI) protection functions, the HQR23B125 provides dependable protection against both sustained overloads and high-level fault currents. With a high interrupting capacity of 65kA at 240VAC, it ensures safe interruption of severe short-circuit conditions in demanding electrical environments.

Built on Siemens’ QR frame standard 40°C platform, this breaker uses a bolt-on mounting design for secure installation. It is supplied with a “no lugs installed” configuration, allowing flexibility in selecting appropriate terminal lugs based on application requirements.

Specifications

• Brand: Siemens
• Part Number: HQR23B125
• Series: QR Series
• Type: HQR2 Molded Case Circuit Breaker
• Category: Molded Case Circuit Breaker
• Mounting Type: Bolt-On
• Frame Type: QR Frame Standard 40°C Breaker
• Protection Type: Thermal Magnetic
• Trip Unit: Fixed, Non-Interchangeable
• Special Features: No Lugs Installed

Electrical Ratings

• Current Rating: 125A
• Voltage Rating: 240VAC
• Number of Poles: 3 Pole
• Phase: 3 Phase
• Interrupting Capacity: 65kA @ 240VAC
• Trip Functions: LI – Long-Time and Instantaneous

Construction

• Low-voltage molded case design
• QR frame construction (40°C standard)
• Bolt-on mounting configuration
• Thermal-magnetic trip mechanism
• Supplied without lugs installed
• Heavy-duty industrial-grade housing
• Designed for high fault-current applications

Functions

• Overload protection
• Short-circuit protection
• Long-time delay protection
• Instantaneous fault protection
• Circuit switching and isolation

Dimensions

• Height: 4.5 in
• Width: 2.53 in
• Depth: 7 in
• Weight: 4.51 lbs

Standards

• CSA Approved

Applications

• Commercial electrical distribution systems
• Industrial power distribution panels
• Switchboards and panelboards
• Three-phase branch circuit protection
• Heavy equipment and feeder protection
• High fault-current installations

Returns are easy

You may return items within 30 days of delivery for a refund.

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