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Siemens BQ2B05000S01 Molded Case Circuit Breaker
- 50A
- 2 Pole
- Bolt-On
Siemens
BQ2B05000S01
Molded Case Circuit Breaker
Brand
Siemens
SKU
BQ2B05000S01
Quantity
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Siemens BQ2B05000S01 - 50A 2 Pole Molded Case Circuit Breaker
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Description
Engineered for advanced control, the Siemens BQ2B05000S01 integrates a factory-installed 120VAC shunt trip mechanism for remote circuit disconnection. This 2-pole, 50A molded case circuit breaker provides reliable thermal-magnetic protection against overcurrents and short circuits. It bolts securely into Siemens P1, P2, and P3 panelboards, making it ideal for commercial and industrial power distribution. The unit is rated at 10kAIC at 120/240VAC and includes standard load side lugs.Specifications
| Brand | Siemens |
|---|---|
| Part Number | BQ2B05000S01 |
| 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 P1, P2, P3 Panelboards |
| Wire Gauge | 8-4 AWG (Cu), 8-2 AWG (Al) |
| Max Wire | 4 AWG (Cu), 2 AWG (Al) |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs, Shunt Trip 120VAC |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
Product FAQs
4 answersWhat does the "S01" suffix mean in the BQ2B05000S01 catalog number?
The "S01" suffix indicates the inclusion of a factory-installed 120VAC shunt trip. Unlike the standard BQ2B050, this model allows for remote tripping of the breaker, which is often required for emergency shutdown systems or automated control.
Which panelboards are compatible with the BQ2B05000S01?
This BQ-frame breaker features a bolt-on connection designed specifically for Siemens P1, P2, and P3 commercial panelboards. It is not compatible with standard plug-on residential load centers.
Is the Siemens BQ2B05000S01 breaker HACR rated?
Yes, Siemens BQ series molded case circuit breakers are HACR rated, making them suitable for protecting heating, air conditioning, and refrigeration equipment.
Are the trip settings adjustable on the BQ2B05000S01?
No, this thermal-magnetic breaker features fixed long-time (thermal) and fixed instantaneous (magnetic) trip functions. The trip points cannot be adjusted in the field.
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Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
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Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
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All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
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.