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Siemens BQ1B020 Molded Case Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
Siemens
BQ1B020
Molded Case Circuit Breaker
Brand
Siemens
SKU
BQ1B020
Quantity
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Siemens BQ1B020 - 20A 1 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Siemens BQ1B020 - 20A 1 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | BQ1B020 |
| Series | BQ |
| Amperage | 20A |
| Poles | 1 |
| 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 | 14-6 AWG (Cu), 12-6 AWG (Al) |
| Max Wire | 6 AWG |
| Min Wire | 14 AWG (Cu), 12 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment, Handle Tie |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, HACR Rated, HID Rated, SWD Rated, UL 489 |
| Approval | CSA, HACR, HID, SWD, UL |
| Temp Rating | 40C |
Quantity
Siemens BQ1B020 - 20A 1 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | BQ1B020-R |
| Series | BQ |
| Amperage | 20A |
| Poles | 1 |
| 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 | 14-6 AWG (Cu), 12-6 AWG (Al) |
| Max Wire | 6 AWG |
| Min Wire | 14 AWG (Cu), 12 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment, Handle Tie |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, HACR Rated, HID Rated, SWD Rated, UL 489 |
| Approval | CSA, HACR, HID, SWD, UL |
| Temp Rating | 40C |
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Description
The BQ1B020 is a 1-pole, 20A molded case circuit breaker engineered for commercial power distribution. It delivers reliable thermal-magnetic trip protection with a 10kAIC rating at 120/240VAC. This bolt-on breaker installs securely into Siemens P1, P2, and P3 panelboards. It comes equipped with load side lugs and accepts 14-6 AWG copper or 12-6 AWG aluminum wiring for flexible installation. This BQ frame breaker is SWD, HID, and HACR rated, making it suitable for lighting and HVAC loads.Specifications
| Brand | Siemens |
|---|---|
| Part Number | BQ1B020 |
| Series | BQ |
| Amperage | 20A |
| Poles | 1 |
| 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 | 14-6 AWG (Cu), 12-6 AWG (Al) |
| Max Wire | 6 AWG |
| Min Wire | 14 AWG (Cu), 12 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment, Handle Tie |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, HACR Rated, HID Rated, SWD Rated, UL 489 |
| Approval | CSA, HACR, HID, SWD, UL |
| Temp Rating | 40C |
Product FAQs
8 answersIs the BQ1B020 suitable for switching lighting and HVAC loads?
Yes, this breaker is SWD (Switching Duty), HID (High Intensity Discharge), and HACR (Heating, Air Conditioning, and Refrigeration) rated. This makes it approved for direct switching of 120V fluorescent lighting, HID lighting, and continuous motor loads.
Will this bolt-on breaker fit a standard Siemens residential load center?
No. The BQ1B020 is designed exclusively for commercial Siemens panelboards, such as the P1, P2, and P3 series. Standard residential load centers typically require a plug-on breaker, such as the Siemens QP line.
Can I use this Siemens breaker to replace an older ITE model?
Yes. Siemens acquired ITE and continues to manufacture the BQ series to the original specifications. This model serves as a direct, code-compliant replacement for vintage ITE breakers sharing the BQ1B020 catalog number.
What are the temperature ratings for the wire terminals?
The load lugs on this 20-amp breaker are UL-listed for use with 60 or 75 degree Celsius rated copper or aluminum conductors.
Can I add a field-installable shunt trip or auxiliary switch to this unit?
No. Internal accessories for Siemens BQ breakers, including shunt trips and auxiliary contacts, are factory-installed only. They must be ordered with the appropriate catalog number suffix and cannot be retrofitted in the field.
Why does this commercial breaker use a bolt-on connection rather than a plug-on?
Bolt-on connections provide a mechanically secured, rigid contact with the panelboard bus. This prevents the breaker from backing off or loosening over time due to heavy vibrations, thermal cycling, or high fault currents, ensuring a safer connection in commercial settings.
What is the physical width of the BQ1B020?
The BQ series features a standard full-size footprint, measuring exactly 1 inch wide per pole.
Does this breaker provide arc-fault (AFCI) or ground-fault (GFCI) protection?
No, the BQ1B020 is a standard thermal-magnetic breaker providing only overload and short-circuit protection. It does not include integral AFCI, GFCI, or dual-function circuitry.
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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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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.