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Siemens QJ22B125L Molded Case Circuit Breaker
- 125A
- 2 Pole
- Unit Mount
Siemens
QJ22B125L
Molded Case Circuit Breaker
Brand
Siemens
SKU
QJ22B125L
Quantity
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Siemens QJ22B125L - 125A 2 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial applications, the Siemens QJ22B125L is a 2-pole, 125A unit mount molded case circuit breaker. Operating at 240VAC, it utilizes a non-interchangeable thermal-magnetic trip unit for reliable overcurrent protection. This QJ frame breaker installs into compatible Siemens enclosures and meter centers. It serves as an exact replacement for older installations, though new applications typically transition to the modern QR22B125L substitute.Specifications
| Brand | Siemens |
|---|---|
| Part Number | QJ22B125L |
| Series | QJ |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | QJ |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Enclosures, Meter 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, Undervoltage Release |
|---|---|
| Accessories | Line and Load Lugs |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip |
Product FAQs
5 answersIs there a modern replacement for the QJ22B125L circuit breaker?
Yes. While the QJ22B125L is still used as an exact replacement for older installations, Siemens has transitioned new applications to the QR22B125L. The QR frame serves as the modern substitute with matching specifications.
What does the L suffix in the QJ22B125L catalog number signify?
The L indicates that the breaker includes factory-installed line and load lugs.
Is the QJ22B125L compatible with standard plug-on load centers?
No. This is a unit mount, feed-thru circuit breaker. It does not plug onto a busbar. It must be hardwired or bolted into compatible Siemens enclosures and meter centers.
What are the wire size requirements for the QJ22B125L lugs?
The terminals accept 6 AWG to 300 kcmil copper conductors, or 4 AWG to 300 kcmil aluminum conductors.
Are the trip settings on the QJ22B125L adjustable?
No. The breaker features a fixed thermal-magnetic trip unit. Both the long-time and instantaneous (LI) trip functions are non-adjustable and non-interchangeable.
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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.