Siemens MBKQJ1125 Main Breaker Kit
Siemens
MBKQJ1125
Main Breaker Kit
Brand
Siemens
SKU
MBKQJ1125
Quantity
Core Specs
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Siemens MBKQJ1125 - 125A 2 Pole Main Breaker Kit
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Quantity
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Description
Serving as the primary disconnect for commercial power systems, this 125-amp kit features a thermal-magnetic trip mechanism. It mounts into original Siemens P1 panelboards, providing a reliable 10kA interrupting capacity at 240VAC. Note that this specific unit is the predecessor to the MBKQR1125A and is intended for older P1 enclosures that have not been revised to accept QR frames. The package includes the necessary mounting hardware and lugs for a complete installation.Specifications
| Brand | Siemens |
|---|---|
| Part Number | MBKQJ1125 |
| Series | MBK |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens P1 Panelboards |
| Wire Gauge | 6 AWG - 300 kcmil (Cu), 4 AWG - 300 kcmil (Al) |
| Max Wire | 300 kcmil |
| Min Wire | 6 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, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Mounting Hardware, Breaker, Lugs Included |
| Standards | UL 489, CSA C22.2 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Main Breaker Kit, 10kA Interrupt Rating |
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 8 reviews.
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Rating
8 reviews
- MEmichael e.Verified BuyerReviewingSiemens MBK150 - 150A 2 Pole Main Breaker KitI recommend this productRated 5 out of 5 stars9/28/26Excellent 👍
Came quickly, in great condition, worked perfectly
- RNRoderick N.Verified BuyerReviewingSiemens MBK200 2 Pole Circuit BreakerI recommend this productRated 5 out of 5 stars7/29/25Exact replacement!
Exact replacement 👍
- WKWilliam K.Verified BuyerReviewingSiemens MBK175A - 175A 2 Pole Main Breaker KitI recommend this productRated 5 out of 5 stars7/29/25Works perfey
Brand new, just as described. This was an odd amperage amount to stock, I'm glad they had this.
- MBMike B.ReviewingSiemens MBK200A - 200A 2 Pole Main Breaker KitI recommend this productRated 5 out of 5 stars3/11/21Classy Breaker
Brand new item, came packaged well. Quick deliverly
- FBFrank B.ReviewingSiemens MBK200A - 200A 2 Pole Main Breaker KitI recommend this productRated 5 out of 5 stars2/7/19Great company would like to
Great company would like to see orders shipped more quickly