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Siemens BQD370 Molded Case Circuit Breaker
- 70A
- 3 Pole
- Bolt-On
Siemens
BQD370
Molded Case Circuit Breaker
Brand
Siemens
SKU
BQD370
Quantity
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Siemens BQD370 - 70A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Quantity
Siemens BQD370 - 70A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | BQD370 |
| Series | BQD |
| Amperage | 70A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC, 125/250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 14kA @ 480Y/277VAC, 14kA @ 125/250VDC |
| Frame Type | BQD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3, P4, P5 Panelboards |
| Wire Gauge | 8-1 AWG (Cu), 6-1/0 AWG (Al) |
| Max Wire | 1 AWG (Cu), 1/0 AWG (Al) |
| Min Wire | 8 AWG (Cu), 6 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 |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip, Quick-Make/Quick-Break, Trip-Free Mechanism |
Quantity
Siemens BQD370 - 70A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | BQD370-R |
| Series | BQD |
| Amperage | 70A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC, 125/250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 14kA @ 480Y/277VAC, 14kA @ 125/250VDC |
| Frame Type | BQD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3, P4, P5 Panelboards |
| Wire Gauge | 8-1 AWG (Cu), 6-1/0 AWG (Al) |
| Max Wire | 1 AWG (Cu), 1/0 AWG (Al) |
| Min Wire | 8 AWG (Cu), 6 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 |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip, Quick-Make/Quick-Break, Trip-Free Mechanism |
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Description
Designed for commercial and industrial power distribution, the Siemens BQD370 provides reliable thermal-magnetic protection in a compact bolt-on footprint. This 70-amp, three-pole molded case circuit breaker is rated for 14kA interrupting capacity at 480Y/277VAC. It mounts into Siemens Sentron P1, P2, P3, P4, and P5 panelboards. Featuring a non-interchangeable trip and quick-make/quick-break mechanism, it ensures consistent performance for branch circuit applications.Specifications
| Brand | Siemens |
|---|---|
| Part Number | BQD370-R |
| Series | BQD |
| Amperage | 70A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC, 125/250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 14kA @ 480Y/277VAC, 14kA @ 125/250VDC |
| Frame Type | BQD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3, P4, P5 Panelboards |
| Wire Gauge | 8-1 AWG (Cu), 6-1/0 AWG (Al) |
| Max Wire | 1 AWG (Cu), 1/0 AWG (Al) |
| Min Wire | 8 AWG (Cu), 6 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 |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip, Quick-Make/Quick-Break, Trip-Free Mechanism |
Product FAQs
7 answersCan the Siemens BQD370 be reverse-fed for use as a main breaker?
Yes, Siemens BQD series thermal-magnetic circuit breakers are UL Listed for reverse feed applications. This allows the BQD370 to be utilized as a back-fed main in compatible panelboards, provided the appropriate service entrance barrier kit is installed.
Is this breaker certified for use with commercial HVAC equipment?
Yes, the BQD370 is HACR rated. This means it is tested and approved to handle the inrush currents and operational demands of heating, air conditioning, and refrigeration equipment loads.
Does the breaker come with both line and load-side lugs?
The BQD370 features a bolt-on line side that connects directly to the panelboard bus, so it does not use line-side wire lugs. However, it includes factory-installed load-side lugs that accept 8 to 1 AWG copper or 6 to 1/0 AWG aluminum wire.
Can I use a BQD6 breaker as a drop-in replacement for the BQD370?
No. While they share the same physical frame dimensions, BQD6 breakers (such as the BQD6370) are CSA certified for the Canadian market and rated for 600Y/347VAC. The BQD370 is the correct UL Listed model for 480Y/277VAC systems in the United States.
What is the advantage of the BQD370 bolt-on design in P-Series panels?
The bolt-on connection mechanically fastens directly to the busbars of Siemens P1 through P5 panelboards. This interlocking design provides a highly secure, vibration-resistant connection, which is critical for reducing arcing and maintaining continuity in high-demand commercial environments.
Does the BQD370 have adjustable trip settings?
No, this breaker utilizes a fixed thermal-magnetic trip unit. Both the thermal and magnetic trip elements are factory-set and cannot be field-adjusted to change the trip curve.
What does the LI trip function code on the BQD370 indicate?
The LI designation stands for Long-Time and Instantaneous. The long-time function provides thermal protection against sustained overloads, while the instantaneous magnetic function provides immediate tripping in the event of a severe short circuit.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 61 reviews.
Reviews Summary
Generated by AI from 47 most recent customer reviews
Last updated 8/15/25
Customers say this electrical supply service delivers breakers with exceptional speed and reliability. Many reviews mention the straightforward ordering process through an easy-to-navigate website. Frequent comments address competitive pricing and accurate product delivery. The selection of breakers receives consistent praise, with users noting the products match specifications precisely. Reviews highlight the availability of inventory and prompt shipping, often exceeding delivery expectations.
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Rating
61 reviews
- 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.
- GNGreg N.Verified BuyerReviewingSiemens BQD340 - 40A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/26/26Excellent Customer Service
Easy ordering & Drew Wilson helped me with this order. I will definitely be using you again in the near future especially with his excellent service he provided.