Siemens HQR23B125HL Molded Case Circuit Breaker
- 125A
- 3 Pole
- Unit Mount
Quantity
Siemens HQR23B125HL - 125A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Designed for standalone applications, the Siemens HQR23B125HL is a 3-pole, 125A unit-mount molded case circuit breaker. It delivers reliable thermal-magnetic overcurrent protection for industrial and commercial electrical systems. Unlike panel-mounted versions, this feed-thru breaker is built for individual mounting in standalone enclosures. It comes standard with both line and load side lugs, accommodating 3 AWG to 300 kcmil aluminum or copper wiring for flexible installation.Specifications
| Brand | Siemens |
|---|---|
| Part Number | HQR23B125HL |
| Series | HQR |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC |
| Frame Type | HQR |
|---|---|
| Terminal Type | Lugs |
| For Use With | Enclosures, Individual Mounting |
| Wire Gauge | 3 AWG - 300 kcmil (Al/Cu) |
| Max Wire | 300 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 | Line and Load Lugs |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip, Push-to-Trip Button, Trip-Free Mechanism, High Interrupting Capacity |
Product FAQs
6 answersWhich standalone enclosures are compatible with the HQR23B125HL circuit breaker?
This QR frame breaker can be installed in Siemens QR series enclosures. Common options include the NEMA 1 indoor QR2N1S (surface mount) or QR2N1F (flush mount), and the NEMA 3R outdoor QR2N3R3 enclosure.
What mounting hardware is required to install this breaker in a Siemens P1 panelboard?
To install a 3-pole QR frame breaker in a revised Siemens P1 panelboard, use the MBKQR3A mounting hardware kit. If you are installing it in an original P1 interior manufactured before 2015, the MBKQR1 kit is required.
Is the HQR23B125HL suitable for reverse feed applications?
Yes, Siemens QR frame molded case circuit breakers feature a non-interchangeable trip unit and are UL listed for reverse feed installations.
What is the recommended lug torque for the HQR23B125HL?
The standard load-side lugs on this breaker, which accept 3 AWG to 300 kcmil aluminum or copper wire, require a tightening torque of 275 lb-in.
How does the HQR frame differ from standard QR2 or QRH2 breakers?
The physical dimensions and mounting are identical across the QR family, but the interrupting ratings differ. The HQR series provides a high interrupting capacity of 100kA at 240V, whereas standard QR2 and QRH2 frames have lower short-circuit ratings (typically 10kA and 25kA, respectively).
Does this breaker include ground fault or equipment protection features?
No. The HQR23B125HL is equipped with a standard thermal-magnetic trip unit providing long-time and instantaneous (LI) overcurrent and short-circuit protection only. It does not include GFCI, AFCI, or equipment ground fault protection.
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