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Siemens BQ2B050 Molded Case Circuit Breaker
- 50A
- 2 Pole
- Bolt-On
Siemens
BQ2B050
Molded Case Circuit Breaker
Brand
Siemens
SKU
BQ2B050
Quantity
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Siemens BQ2B050 - 50A 2 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Siemens BQ2B050 - 50A 2 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | BQ2B050 |
| Series | BQ |
| Amperage | 50A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | BQ |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Panelboards |
| Wire Gauge | 8-6 AWG (Cu), 8-4 AWG (Al) |
| Max Wire | 6 AWG (Cu), 4 AWG (Al) |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, HACR Rated, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
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Siemens BQ2B050 - 50A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | BQ2B050-R |
| Series | BQ |
| Amperage | 50A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | BQ |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Panelboards |
| Wire Gauge | 8-6 AWG (Cu), 8-4 AWG (Al) |
| Max Wire | 6 AWG (Cu), 4 AWG (Al) |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, HACR Rated, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
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Description
Part of the Siemens BQ family, this 50A molded case circuit breaker delivers long-time and instantaneous trip functions for maximum current limiting protection. The 2-pole device is rated for 120/240VAC systems and features a 10kAIC interrupting capacity. It mounts securely into standard Siemens panelboards using a bolt-on connection, ensuring a stable fit for commercial and industrial environments. The breaker includes load side lugs and carries a HACR rating for HVAC applications.Specifications
| Brand | Siemens |
|---|---|
| Part Number | BQ2B050 |
| Series | BQ |
| Amperage | 50A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | BQ |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Panelboards |
| Wire Gauge | 8-6 AWG (Cu), 8-4 AWG (Al) |
| Max Wire | 6 AWG (Cu), 4 AWG (Al) |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, HACR Rated, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
Product FAQs
7 answersWhich panelboards are compatible with the Siemens BQ2B050?
This BQ frame bolt-on breaker is designed for commercial Siemens panelboards including P1, P2, P3, S1, and S2 series, as well as legacy ITE and Gould equivalent panels that accept bolt-on branch breakers.
Will the BQ2B050 fit into a standard plug-on residential load center?
No. This is a bolt-on breaker intended for commercial panelboards equipped with threaded busbars. It will not attach to residential load centers that require plug-on QP style breakers.
What is the difference between Siemens BQ, BQH, and HBQ series breakers?
The difference lies in their maximum short circuit interrupting ratings. The standard BQ series is rated at 10kAIC at 120/240VAC. The BQH series provides a 22kAIC rating, and the HBQ series offers a 65kAIC rating. All three series share the same physical footprint and panelboard compatibility.
Is the Siemens BQ2B050 a direct replacement for legacy ITE BQ breakers?
Yes. Siemens acquired the ITE electrical distribution brand. Current Siemens BQ series breakers are direct, UL approved replacements for older ITE, Gould, and Bulldog breakers sharing the exact same catalog numbers.
How is the line side of the BQ2B050 breaker connected to the panel?
The breaker fastens directly to the panelboard busbar using standard mounting screws. This bolt-on design creates a secure mechanical and electrical connection that resists vibration in commercial and industrial environments.
Is the Siemens BQ2B050 suitable for reverse feed applications?
Yes. Siemens BQ frame circuit breakers feature non-interchangeable thermal magnetic trip units and are approved for reverse feed installations under UL 489 standards.
Is the BQ2B050 HACR rated for HVAC motor loads?
Yes. This circuit breaker carries a HACR rating, making it code compliant for protecting heating, air conditioning, and refrigeration equipment circuits.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 73 reviews.
Reviews Summary
Generated by AI from 67 most recent customer reviews
Last updated 6/3/26
Customers say these breakers arrive quickly and fit perfectly for their electrical needs. Fast shipping and competitive pricing are frequently mentioned, with many users appreciating the availability of hard-to-find and older-style breakers. The products are well-packaged and arrive in good condition. Most customers report successful installations and reliable performance. A few note missing items from orders or concerns about product condition, though the majority express satisfaction with their purchases and indicate they would order again.
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Rating
73 reviews
- HSHector S.Verified BuyerReviewingSiemens BQ3B100H - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/27/26Perfect replacement
Fit perfectly and good price
- AFAnthony F.Verified BuyerReviewingSiemens BQ2B020 - 20A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/25/26works as expected
works as expected
- MSMike S.Verified BuyerReviewingEaton / Cutler-Hammer BQ250250 - 50/50A Quadplex Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/12/26Electrical company
Breaker worked awesome thank you very much
- PEPhilip E.Verified BuyerReviewingSiemens BQ3B020 - 20A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/10/26Siemens BQ3B020
The breaker arrived as described and on time. It works as expected. I will order from SuperBreakers again in the future without hesitation.
- PLPaul L.Verified BuyerReviewingSiemens BQ1B020 - 20A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/23/26Breaker
Quick shipping. Exact fit.