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Siemens BQ3B020 Molded Case Circuit Breaker
- 20A
- 3 Pole
- Bolt-On
Siemens
BQ3B020
Molded Case Circuit Breaker
Brand
Siemens
SKU
BQ3B020
Quantity
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Siemens BQ3B020 - 20A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Quantity
Siemens BQ3B020 - 20A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | BQ3B020 |
| Series | BQ |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 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 |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs |
| Standards | HACR Rated, UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
Sold out
Quantity
Siemens BQ3B020 - 20A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | BQ3B020-R |
| Series | BQ |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 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 |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs |
| Standards | HACR Rated, UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
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Description
Built to handle demanding commercial electrical loads, this 3-pole 20A breaker provides essential overcurrent and short-circuit protection. The bolt-on configuration mounts firmly into Siemens P1, P2, and P3 panelboards, ensuring a stable connection in high-vibration environments. It also serves as an effective substitute for BAB3020 and THQB32020 models. Featuring a 10kAIC rating at 240VAC, the thermal-magnetic trip mechanism delivers consistent performance and HACR-rated reliability.Specifications
| Brand | Siemens |
|---|---|
| Part Number | BQ3B020-R |
| Series | BQ |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 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 |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs |
| Standards | HACR Rated, UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
Product FAQs
5 answersWhich panelboards are compatible with the BQ3B020 circuit breaker?
This bolt-on breaker is designed specifically for Siemens P1, P2, and P3 series commercial distribution panelboards. It is also compatible with many legacy ITE panelboards that accept BQ frame circuit breakers.
Are there direct equivalents to the BQ3B020 with a higher interrupting rating?
Yes. If your system requires a higher fault current rating, Siemens manufactures the BQH3B020 rated for 22 kAIC and the HB3B020 (sometimes listed as HBQ3B020) rated for 65 kAIC at 240VAC.
What are typical applications for this 20-amp, 3-pole breaker?
The BQ3B020 is a commercial-grade device frequently used to protect three-phase lighting circuits, small motors, and specialized HVAC equipment. Its fixed thermal-magnetic trip unit responds rapidly to both standard overcurrents and short circuits.
How does this breaker connect to the panelboard?
Unlike plug-on residential breakers, the BQ3B020 utilizes a bolt-on mounting configuration. It fastens directly to the panelboard bus bar with mounting screws, providing the robust mechanical and electrical connection required for industrial and commercial environments.
What wire sizes are accepted by the load lugs on the BQ3B020?
The factory-installed load side lugs are rated for 14 to 6 AWG copper conductors, or 12 to 6 AWG aluminum conductors. Installers should always tighten terminal connections to the exact torque specifications printed directly on the circuit breaker label.
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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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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.