Free Shipping Over $99
Free Shipping Over $99
Free Shipping Over $99
Free Shipping Over $99
Siemens BQD120 Molded Case Circuit Breaker
- 20A
- 1 Pole
- Bolt-On
Siemens
BQD120
Molded Case Circuit Breaker
Brand
Siemens
SKU
BQD120
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Siemens BQD120 - 20A 1 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Siemens BQD120 - 20A 1 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | BQD120 |
| Series | BQD |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 277VAC, 125VDC |
| Phase | 1 |
| AIC Rating | 65kA @ 120VAC, 14kA @ 277VAC, 14kA @ 125VDC |
| Frame Type | BQD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3, P4, P5 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 |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, HACR, HID, SWD, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, SWD Rated, Reverse Feed, Non-Interchangeable Trip, Quick-Make/Quick-Break, Trip-Free Mechanism |
Quantity
Siemens BQD120 - 20A 1 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | BQD120-R |
| Series | BQD |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 277VAC, 125VDC |
| Phase | 1 |
| AIC Rating | 65kA @ 120VAC, 14kA @ 277VAC, 14kA @ 125VDC |
| Frame Type | BQD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3, P4, P5 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 |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, HACR, HID, SWD, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, SWD Rated, Reverse Feed, Non-Interchangeable Trip, Quick-Make/Quick-Break, Trip-Free Mechanism |
Similar Items
15A 1 Pole Molded Case Circuit Breaker
30A 1 Pole Molded Case Circuit Breaker
35A 1 Pole Molded Case Circuit Breaker
Description
Designed to accommodate 14-6 AWG copper wiring, this 20-amp bolt-on breaker delivers dependable overcurrent protection for industrial and commercial facilities. It integrates seamlessly into Siemens P1, P2, P3, P4, and P5 panelboards to support complex distribution networks. The device features a reverse-feed mechanism and carries HACR, SWD, and HID ratings, making it highly adaptable for heating, cooling, and high-intensity discharge lighting loads.Specifications
| Brand | Siemens |
|---|---|
| Part Number | BQD120 |
| Series | BQD |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 277VAC, 125VDC |
| Phase | 1 |
| AIC Rating | 65kA @ 120VAC, 14kA @ 277VAC, 14kA @ 125VDC |
| Frame Type | BQD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3, P4, P5 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 |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, HACR, HID, SWD, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, SWD Rated, Reverse Feed, Non-Interchangeable Trip, Quick-Make/Quick-Break, Trip-Free Mechanism |
Product FAQs
9 answersWhich panelboards are compatible with the BQD120?
This bolt-on breaker is engineered exclusively for Siemens commercial distribution panels, specifically the P1, P2, P3, P4, and P5 series panelboards.
What do the SWD and HID markings indicate on this breaker?
The SWD (Switching Duty) rating allows the breaker to be used as a regular switch for 120V fluorescent lighting circuits. The HID (High-Intensity Discharge) rating means it is engineered to safely handle the high inrush currents of commercial HID lighting fixtures without nuisance tripping.
Is the Siemens BQD120 approved for HVAC equipment?
Yes, it carries a HACR rating, meaning it has been tested and certified for use with Heating, Air Conditioning, and Refrigeration equipment that requires this standard of overcurrent protection.
How does this breaker connect to the panelboard bus?
The BQD120 features a bolt-on line tab. It must be mechanically fastened directly to the panel busbar with a bolt, providing a high-reliability connection that resists loosening from electrical vibrations in commercial settings.
What is the difference between Siemens BQD and CQD circuit breakers?
While both use the same 1-inch pole width and core frame size, their mounting applications differ. The BQD is a bolt-on breaker designed for commercial panelboards, whereas the CQD series is intended for DIN rail mounting or cable-in, cable-out configurations.
What size wire can be used with the BQD120 lugs?
The factory-installed load lugs accept 14 to 6 AWG copper wire or 12 to 6 AWG aluminum wire. Always ensure the wire is properly stripped and torqued according to the manufacturer specifications printed on the breaker body.
Is the Siemens BQD120 rated for direct current (DC) systems?
Yes, it is rated for use in 125VDC applications with a 14kA interrupting capacity. This makes it suitable for certain industrial control circuits and battery backups, in addition to its standard alternating current (AC) ratings.
What type of trip mechanism does this breaker use?
It relies on a fixed thermal-magnetic trip unit with Long-Time (L) and Instantaneous (I) functions. The thermal element safely interrupts sustained overloads, while the magnetic element quickly clears severe short circuits.
Can I add a shunt trip or auxiliary switch to the BQD120?
Yes, the BQD frame allows for field-installable internal accessories. Add-on modules like shunt trips, auxiliary switches, or alarm switches can be mechanically attached to the left side of the breaker housing.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
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.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
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.
International Shipping
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 62 reviews.
Reviews Summary
Generated by AI from 62 most recent customer reviews
Last updated 10/29/26
Customers say these breakers arrive quickly and are priced competitively. The ordering process is straightforward and easy to navigate. Many reviews highlight fast shipping that often exceeds expectations, with inventory readily available. Customers appreciate the product quality and condition, noting breakers perform as described. Common feedback addresses responsive customer service and knowledgeable staff. The combination of competitive pricing, rapid delivery, and reliable service creates a positive purchasing experience for repeat customers.
Search
Rating
62 reviews
- RGRobert G.Verified BuyerReviewingSiemens BQD340 - 40A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars10/28/2640A 3 Pole BQD340
Breaker was as ordered, showed up as expected and on time. Happy!
- PCPACIFIC C. B.Verified BuyerReviewingSiemens BQD380 - 80A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/11/26Used breaker in like New state
Order a reconditioned breaker to fulfill an order, it was in excellent condition . Price was just right.
Very satisfied with my purchase and the end user was happy as well.
- BCBubba C.Verified BuyerReviewingSiemens BQD390 - 90A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/24/26BQD breakers
Always love working with Superbreakers! Excellent pricing and availability on pretty much any sort of breaker you need. The packaging is always top notch and they ship your order out as soon as you purchase. Love working with the Superbreakers team!
- LPLUCIAN P.Verified BuyerReviewingSiemens BQD2100 - 100A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/21/26Super breakers
Very good prices , well stock inventory.
Looking forward for more business opportunities.
I like the knowledge that the company employs
professionals and people who are willing to help and support.
- RGRon G.Verified BuyerReviewingSiemens BQD320 - 20A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/2/26Breakers
Order was shipped and on time. The ordering process was easy and the service was great.