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Siemens Q2125BHH Miniature Circuit Breaker
- 125A
- 2 Pole
- Plug-On
Siemens
Q2125BHH
Miniature Circuit Breaker
Brand
Siemens
SKU
Q2125BHH
Quantity
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Siemens Q2125BHH - 125A 2 Pole Miniature Circuit Breaker
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Description
Built for commercial and industrial applications, the Siemens Q2125BHH is a 2-pole, 125A miniature circuit breaker that delivers exceptional performance. It provides reliable thermal-magnetic protection for heavy-duty electrical systems. Designed for quick installation, this plug-on breaker mounts into compatible Siemens load centers and panelboards. It features Insta-Wire technology to speed up wiring connections.Specifications
| Brand | Siemens |
|---|---|
| Part Number | Q2125BHH |
| Series | Q |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 65kA @ 240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers, Siemens Panelboards |
| Wire Gauge | 4-2/0 AWG (Cu/Al) |
| Max Wire | 2/0 AWG |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | High Interrupting Capacity (65kA), Common Trip, HACR Rated |
Product FAQs
7 answersWhich panels are compatible with the Siemens Q2125BHH?
This Q-frame breaker is designed for plug-on installation in Siemens load centers and panelboards that accept QP type breakers.
What applications require the 65kAIC rating of the Q2125BHH?
The 65kAIC interrupting capacity is typically required in commercial or industrial environments, or in residential settings located very close to a utility transformer where available fault currents exceed standard 10kAIC or 22kAIC limits.
How does the Insta-Wire feature on the Q2125BHH assist with installation?
The Insta-Wire design means the terminal screws are shipped backed out and ready for wire insertion, saving electricians time during the wiring process.
Can the Siemens Q2125BHH replace an older ITE breaker?
Yes, Siemens acquired ITE, and this breaker serves as the direct replacement for the legacy ITE Q2125BHH.
What are the acceptable wire materials and gauges for the Q2125BHH lugs?
The lugs are rated for both copper and aluminum conductors, accepting wire sizes from 4 AWG up to 2/0 AWG.
How does the thermal-magnetic trip unit operate on the Q2125BHH?
The thermal component provides long-time delayed protection against sustained overloads, while the magnetic component provides instantaneous tripping during severe short circuits.
Is the Q2125BHH HACR rated?
Yes, this breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 48 reviews.
Reviews Summary
Generated by AI from 91 most recent customer reviews
Last updated 8/1/25
Customers say these circuit breakers arrive quickly and match their specifications perfectly. Many reviews mention success finding hard-to-locate specialty breakers through this supplier. Common feedback includes praise for the accurate product descriptions, reliable shipping, and competitive pricing. While some note occasional stock limitations, users consistently report the breakers fit and function as intended.
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Rating
48 reviews
- DTDawn T.Verified BuyerReviewingSiemens Q2150B - 150A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars10/8/26Timely
This is exactly what I was looking for! Worked perfectly, arrived promptly, no hassles.
- CGCrocefissa G.Verified BuyerReviewingSiemens Q115 - 15A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/18/26Quick delivery and great price.
The circuit breakers are at a great cost.
- JBJason B.Verified BuyerReviewingSiemens Q2150B - 150A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/18/26Great experience
The product was exactly what I needed and it arrived on time.
- DQDon Q.Verified BuyerReviewingSiemens Q3100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/14/26Siemens breaker
Great customer experience, great prices and fast shipping... Definitely will be buying her again.
- CSChristopher S.Verified BuyerRated 5 out of 5 stars8/12/26Siemens 60
Perfect new condition