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Siemens BQ2B125H Molded Case Circuit Breaker
- 125A
- 2 Pole
- Bolt-On
Siemens
BQ2B125H
Molded Case Circuit Breaker
Brand
Siemens
SKU
BQ2B125H
Quantity
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Siemens BQ2B125H - 125A 2 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial distribution, the Siemens BQ2B125H is a 2-pole, 125A molded case circuit breaker. It provides thermal-magnetic overcurrent protection with a 22kA interrupting capacity at 120/240VAC. This unit mounts into Siemens P1 through P5 panelboards using a bolt-on configuration. It features load side lugs and serves as a substitute for BAB2125H and THQB21125 breakers. HACR rated for HVAC equipment, this BQH series breaker includes common trip functionality.Specifications
| Brand | Siemens |
|---|---|
| Part Number | BQ2B125H |
| Series | BQH |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 22kA @ 120/240VAC |
| Frame Type | BQ |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Panelboards (P1, P2, P3, P4, P5) |
| 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, Handle Tie |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Non-Interchangeable Trip, High Interrupting Capacity |
Product FAQs
5 answersWhat is the difference between the Siemens BQ2B125 and the BQ2B125H?
The primary difference is the interrupting capacity. The standard BQ2B125 is rated at 10kAIC at 240V, while the BQ2B125H features a high-interrupting rating of 22kAIC at 240V.
Which panelboards are compatible with the BQ2B125H circuit breaker?
This breaker is designed for use in Siemens P1, P2, P3, P4, and P5 series panelboards. It features a bolt-on connection that mounts directly to the panelboard bus.
Can the BQ2B125H be reverse fed?
Yes. Because it features a non-interchangeable thermal-magnetic trip unit, this breaker is suitable for reverse feed applications in accordance with UL 489 standards.
Does this breaker require a hold-down kit when used as a back-fed main?
No. Because the BQ2B125H is a bolt-on circuit breaker, it is inherently secured to the panelboard bus and does not require an additional hold-down kit like plug-on breakers do.
What type of protection does the LI trip function provide?
The fixed thermal-magnetic trip unit includes Long-Time (L) protection to handle electrical overloads and Instantaneous (I) protection to clear short-circuit faults.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
Total 5 star reviews: 2 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
2 reviews
- YRYoan R.Verified BuyerReviewingSiemens BQ2B125H - 125A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/19/26Best prices and quality 🫶
Best prices and quality 🫶
- JDJames D.ReviewingSiemens BQ2B030H - 30A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars11/13/17shop manager
thanks for the fast accurate service