Siemens Q2125HH Miniature Circuit Breaker
- 125A
- 2 Pole
- Plug-On
Quantity
Siemens Q2125HH - 125A 2 Pole Miniature Circuit Breaker
New
Quantity
Description
Delivering high interrupting capacity for demanding environments, this 125A thermal-magnetic component provides reliable overcurrent protection. It serves commercial and industrial facilities requiring robust electrical infrastructure. The unit mounts into Siemens EQ, PL, and ES series load centers as well as compatible panelboards. The plug-on configuration ensures straightforward integration into existing setups.Specifications
| Brand | Siemens |
|---|---|
| Part Number | Q2125HH |
| Series | Q |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 65kA @ 120/240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers, Siemens Panelboards |
| Wire Gauge | 2-1/0 AWG (Cu), 1/0-2/0 AWG (Al) |
| Max Wire | 1/0 AWG (Cu), 2/0 AWG (Al) |
| Min Wire | 2 AWG (Cu), 1/0 AWG (Al) |
| 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
5 answersWhat load centers are compatible with the Siemens Q2125HH?
This Type HQP plug-in breaker is compatible with Siemens, ITE, and Gould load centers that accept QP-frame breakers. Always verify your specific panel label to confirm it is rated to accept a 125A branch or back-fed main breaker.
What does the "HH" suffix mean on the Q2125HH catalog number?
The "HH" indicates a factory high-interrupting rating of 65kAIC at 120/240VAC (Type HQP). This provides higher fault current protection compared to standard Q2125 (10kAIC) or Q2125H (22kAIC) models.
Is the Q2125HH a plug-in or bolt-on circuit breaker?
The Q2125HH features a plug-in (plug-on) mounting style for load centers. If your panelboard requires a bolt-on connection, you will need a Type BQ equivalent, such as the B2125HH.
Can the Q2125HH be installed as a back-fed main breaker?
Yes, it can be used as a main breaker in compatible load centers. However, the National Electrical Code (NEC) requires it to be secured with a main breaker hold-down retainer kit, such as the Siemens ECMBR1, when back-fed.
Can I use the Q2125HH to upgrade an older ITE 125A breaker?
Yes, Siemens Q-series breakers are the direct, UL-listed replacements for legacy ITE and Gould Type QP breakers. The Q2125HH will fit the same plug-in footprint while offering a 65kAIC rating.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 49 reviews.
- BBBrent b.Verified BuyerReviewingSiemens Q33000S01 - 30A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars11/14/26Fit and fine
These breakers are newly required here in Los Angeles County and they fit right in. Due to the forth space I had to be careful with phasing and moving singles but it all went great.
- 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.