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Siemens QJ23B125L Molded Case Circuit Breaker
- 125A
- 3 Pole
- Unit Mount
Siemens
QJ23B125L
Molded Case Circuit Breaker
Brand
Siemens
SKU
QJ23B125L
Quantity
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Siemens QJ23B125L - 125A 3 Pole Molded Case Circuit Breaker
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Description
Built for industrial power distribution, this 125A, 3-pole MCCB utilizes fixed thermal and magnetic trip units for Long-Time and Instantaneous (LI) protection. The unit-mount design fits Siemens P1, P2, and P3 panelboards or enclosures. As part of the QJ frame series, it is replaced by the newer QR23B125L model. The "L" suffix indicates both line and load lugs are included. It features a 10kAIC rating at 240VAC and is HACR and reverse-feed rated.Specifications
| Brand | Siemens |
|---|---|
| Part Number | QJ23B125L |
| Series | QJ |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | QJ |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3 Panelboards, Meter Centers, Enclosures |
| 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 | Line and Load Lugs |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip |
Product FAQs
8 answersWhich panelboards are compatible with the QJ23B125L?
This unit mount breaker is designed for installation in Siemens P1, P2, and P3 panelboards, as well as compatible Siemens meter centers and enclosures.
What is the modern replacement for the QJ23B125L?
The Siemens QJ frame series has been replaced by the newer QR frame series. The direct replacement for this model is the Siemens QR23B125L.
What does the L suffix in the QJ23B125L catalog number mean?
The L suffix indicates that the circuit breaker is supplied with both line and load side lugs installed from the factory.
What are the acceptable wire sizes for the lugs on this breaker?
The terminals accept 6 AWG to 300 kcmil copper conductors, or 4 AWG to 300 kcmil aluminum conductors.
How is the QJ23B125L installed in a system?
This is a feed-thru, unit mount circuit breaker. It requires bolt-on mounting within the enclosure or panelboard rather than a plug-in connection.
Can the QJ23B125L be used in reverse-feed applications?
Yes, this molded case circuit breaker is reverse-feed rated for applications requiring backfeeding.
Is the QJ23B125L rated for HVAC equipment?
Yes, this breaker is HACR rated, making it suitable for use with heating, air conditioning, and refrigeration motor group loads.
What safety precautions are required before installing the QJ23B125L?
Always de-energize the panelboard or enclosure before installation. Verify that the power is off using a properly rated voltage sensing device to prevent arc flash and shock hazards.
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Reviews
Review summary
Customers rate this product 4.8 out of 5 based on 10 reviews.
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Rating
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.