Siemens QJ23B12500S01 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Unit Mount
Quantity
Siemens QJ23B12500S01 - 125A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Siemens QJ23B12500S01 - 125A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | QJ23B12500S01 |
| Series | QJ |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens Meter Centers, Panelboards, Switchboards |
| 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, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs, Shunt Trip |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip, Trip-Free Mechanism |
Quantity
Siemens QJ23B12500S01 - 125A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | QJ23B12500S01 |
| Series | QJ |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens Meter Centers, Panelboards, Switchboards |
| 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, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs, Shunt Trip |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip, Trip-Free Mechanism |
Description
Designed for remote shutdown applications, this 125A molded case circuit breaker includes a factory-installed 120/240VAC shunt trip. The 3-pole SENTRON device delivers reliable thermal-magnetic protection for commercial facilities. It mounts into Siemens meter centers, panelboards, and switchboards. For modern replacements, this QJ frame transitions to the QR23B125, requiring a separate S01QR2 shunt trip accessory. Operating at 10kAIC at 240VAC, the breaker is HACR and reverse feed rated.Specifications
| Brand | Siemens |
|---|---|
| Part Number | QJ23B12500S01 |
| Series | QJ |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens Meter Centers, Panelboards, Switchboards |
| 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, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs, Shunt Trip |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip, Trip-Free Mechanism |
Product FAQs
7 answersWhat is the modern replacement for the QJ23B12500S01 circuit breaker?
The direct modern replacement is the Siemens QR23B125. Because the QJ23B12500S01 includes a factory-installed shunt trip, you will also need to purchase the S01QR2 shunt trip accessory. The QR frame shares the same form factor and mounting for an easy retrofit.
What does the 00S01 suffix mean on this Siemens QJ breaker?
The 00S01 suffix indicates the breaker includes a factory-installed 120/240VAC shunt trip. This allows the breaker to be tripped remotely, which is commonly used for emergency shutdown applications.
What wire sizes are accepted by the lugs on the QJ23B12500S01?
The standard lugs accept 6 AWG to 300 kcmil copper conductors, or 4 AWG to 300 kcmil aluminum conductors.
Which enclosures are designed to accept the QJ23B12500S01?
This QJ frame breaker is designed for use in commercial Siemens meter centers, panelboards, and switchboards that accept unit mount, bolt-on breakers.
Are the thermal and magnetic trip settings adjustable on this breaker?
No. The QJ23B12500S01 features a fixed thermal-magnetic trip unit with Long-Time and Instantaneous (LI) functions. Neither the thermal overload nor the instantaneous short-circuit settings can be adjusted in the field.
How is the QJ23B12500S01 installed in a panel?
This is a unit mount circuit breaker, meaning it bolts directly into the panelboard or switchboard chassis rather than plugging onto a busbar.
Is the QJ23B12500S01 suitable for reverse feeding and HVAC equipment?
Yes, this circuit breaker is both reverse feed rated and HACR rated, making it suitable for heating, air conditioning, and refrigeration applications.
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Reviews
Review summary
Customers rate this product 4.8 out of 5 based on 10 reviews.
- WMWilliam M.Verified BuyerReviewingSiemens QJ23B125 - 125A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/11/26Breaker
Perfect
- TNTimothy N.Verified BuyerReviewingSiemens QJ23B200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/27/2610% off
Arrived on time, worked when turned on
- WKWillie K.Verified BuyerReviewingSiemens QJ23B150 - 150A 3 Pole Molded Case Circuit BreakerI recommend this productRated 4 out of 5 stars7/22/26Breaker
The Breaker arrive fast and in good condition however when I looked at the specs it was not the correct one.
- PGPhil G.Verified BuyerReviewingSiemens QJ23B200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/3/26Great Service
I was in a bind for this breaker that was for an elevator, and Nick got me all the components even though their blizzard! Will use them for all my specialty breakers.
- VCVladimir C.Verified BuyerReviewingSiemens QJ22B200 - 200A 2 Pole Molded Case Circuit BreakerI recommend this productRated 4 out of 5 stars12/10/254 start
The breaker was it perfect match.,but it was missing the two top bolts.