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Siemens HQR23B125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
Siemens
HQR23B125
Molded Case Circuit Breaker
Brand
Siemens
SKU
HQR23B125
Quantity
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Siemens HQR23B125 - 125A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial and industrial power distribution, the Siemens HQR23B125 is a 3-pole, 125A molded case circuit breaker. It provides reliable thermal-magnetic overcurrent protection for demanding electrical systems. This bolt-on MCCB installs into Siemens P1, P2, and P3 panelboards, as well as compatible switchboards. It serves as a drop-in replacement for legacy QJ frame breakers, ensuring a seamless upgrade path for existing infrastructure.Specifications
| Brand | Siemens |
|---|---|
| Part Number | HQR23B125 |
| Series | HQR |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens P1, P2, P3 Panelboards, Switchboards |
| Wire Gauge | 3 AWG - 300 kcmil (Cu), 6 AWG - 350 kcmil (Al) |
| Max Wire | 350 kcmil |
| Min Wire | 3 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Push-to-Trip Button, Non-Interchangeable Trip, High Interrupting Capacity |
Product FAQs
6 answersCan the HQR23B125 be used to replace an older QJ-frame breaker?
Yes, the Siemens QR frame is the direct replacement for the discontinued QJ frame. It shares the same physical footprint and mounts into the same Siemens P1, P2, and P3 panelboards.
Is the Siemens HQR23B125 suitable for reverse feeding?
Yes, this breaker features a non-interchangeable trip unit and is rated for reverse feeding, allowing it to be back-fed in compatible panelboards and switchboards.
Is this circuit breaker HACR rated?
Yes, the HQR23B125 is HACR rated, making it suitable for use with heating, air conditioning, and refrigeration equipment.
Does this breaker include internal accessories like a shunt trip or auxiliary switch?
No, the standard HQR23B125 does not come with factory-installed internal accessories. However, the QR frame supports UL listed field-installable internal accessories if your application requires them.
What are the lug torque specifications for the HQR23B125?
Torque specifications depend on the wire size. For standard lugs, tighten 3 AWG to 1/0 AWG conductors to 100 in-lb, and 2/0 AWG to 300 kcmil conductors to 225 in-lb. Always verify the torque label on the breaker before terminating.
Does the HQR23B125 feature a push-to-trip button?
Yes, Siemens QR frame breakers include a push-to-trip button on the faceplate for easy mechanical testing of the tripping mechanism.
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