Siemens MBKQJ3225H Main Breaker Kit
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Core Specs
See full specsSiemens MBKQJ3225H - 225A 3 Pole Main Breaker Kit
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Description
Built to protect circuits against overloads and short circuits, the Siemens MBKQJ3225H is a main breaker kit in the MBKQJ series. It has a rated current of 225A, a 240V voltage rating and a 42kA interrupting rating at 240V. This 3-pole, 3-phase breaker has bolt-on mounting and terminal connections. Thermal magnetic tripping provides long-time and instantaneous protection.Specifications
| Brand | Siemens |
|---|---|
| Part Number | MBKQJ3225H |
| Series | MBK |
| Amperage | 225A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| Max Wire | 300 kcmil |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Available Options | Alarm Switch, Auxiliary Switch, Shunt Trip |
|---|---|
| Standards | UL 489 |
| Approval | UL |
| Temp Rating | 40C |
Product FAQs
6 answersHow does the 240 V rating guide breaker selection?
The breaker is rated for 240 V. Check the circuit voltage when selecting it, and evaluate the interrupting rating at that voltage separately from the current rating.
What does the 42 kA interrupting rating at 240 V mean for installation?
This rating describes the fault current the breaker can interrupt at 240 V. The available fault current at the installation point must not exceed 42 kA.
Why do the three-phase and three-pole ratings matter?
This is a three-pole breaker for a three-phase circuit. Use those ratings when selecting a breaker to protect the circuit's three phase conductors.
How does the thermal-magnetic LI trip protect the circuit?
The thermal element provides long-time overload protection, while the magnetic element provides instantaneous response to high fault current. LI means long-time and instantaneous protection, addressing sustained overloads and short circuits.
What installation method do the bolt-on mounting and terminals require?
Plan for bolted attachment of the breaker and bolted terminal connections. Secure fastening at both points is important for mechanical stability and reliable electrical connections.
How should I use the Siemens MBKQJ3225H's current rating when sizing a circuit?
Select the breaker using its rated current, the circuit's calculated load, conductor ampacity and applicable sizing requirements. Rated current is not the instantaneous trip threshold.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 9 reviews.
- RRRichard R.Verified BuyerReviewingSiemens MBK175A - 175A 2 Pole Main Breaker KitI recommend this productRated 5 out of 5 stars10/16/26Main breaker replacement
I was in a real in real bind. I needed a main breaker in a size that everyone told me wasn’t available anymore . Mike at Super Breakers proved them wrong. They not only had the breaker in stock but I had it the next day.
Thank you
Richard Reeves
Reeves Electric Inc
- 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 - 200A 2 Pole Main Breaker KitI 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