Siemens HQJ23B125H Molded Case Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
Quantity
Siemens HQJ23B125H - 125A 3 Pole Molded Case Circuit Breaker
New
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Description
Engineered for high-fault environments, the Siemens HQJ23B125H is a 3-pole, 125A molded case circuit breaker. It delivers robust thermal-magnetic protection for demanding commercial and industrial three-phase systems. This bolt-on QJ-frame breaker installs into Siemens P1, P2, and P3 panelboards, as well as compatible switchboards. It is officially replaced by the HQR23B125H model for modern upgrades. With an extra-high 100kAIC rating at 240VAC, this HACR-rated unit supports reverse feeding.Specifications
| Brand | Siemens |
|---|---|
| Part Number | HQJ23B125H |
| Series | HQJ |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens P1, P2, P3 Panelboards, Switchboards, Meter Centers, Motor Control Centers |
| Wire Gauge | 6 AWG-300 kcmil (Cu), 4 AWG-300 kcmil (Al) |
| Max Wire | 300 kcmil |
| Min Wire | 6 AWG (Cu), 4 AWG (Al) |
| 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 |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Extra High Interrupting Capacity, Non-Interchangeable Trip, Trip-Free Mechanism, Common Trip |
Product FAQs
6 answersWhat is the modern replacement for the Siemens HQJ23B125H?
The QJ frame has been superseded by the newer QR frame series. The official modern replacement for this breaker is the Siemens HQR23B125H.
What does the H suffix in the HQJ23B125H catalog number signify?
The H suffix designates an extra-high interrupting capacity. This specific model provides a 100kAIC rating at 240VAC, which is higher than the 65kAIC rating of the standard HQJ23B125.
What equipment is the HQJ23B125H breaker designed to fit?
This bolt-on QJ frame breaker installs directly into Siemens P1, P2, and P3 panelboards. It is also compatible with Siemens switchboards, meter centers, and motor control centers.
Is the HQJ23B125H suitable for HVAC equipment and reverse feeding?
Yes, this breaker is HACR rated for use with heating, air conditioning, and refrigeration systems. It also supports reverse feed applications.
What are the wire size limits for the lugs on this 125A breaker?
The terminals accommodate copper conductors from 6 AWG up to 300 kcmil, and aluminum conductors from 4 AWG up to 300 kcmil.
Does the HQJ23B125H feature an adjustable trip unit?
No, this breaker comes with a non-interchangeable thermal magnetic trip unit featuring fixed long-time and fixed instantaneous trip functions.
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