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Siemens BQD145 Molded Case Circuit Breaker
- 45A
- 1 Pole
- Bolt-On
Siemens
BQD145
Molded Case Circuit Breaker
Brand
Siemens
SKU
BQD145
Quantity
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Siemens BQD145 - 45A 1 Pole Molded Case Circuit Breaker
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Description
Providing 45 amps of thermal-magnetic protection, the Siemens BQD145 is a 1-pole molded case circuit breaker optimized for commercial facilities. It operates at up to 277VAC, delivering a 14 kAIC interrupting rating to safeguard critical branch circuits. This BQD frame breaker fastens securely into Siemens P1, P2, P3, P4, and P5 panelboards via a standard bolt-on connection. It accepts 8-1 AWG copper or 6-1/0 AWG aluminum wiring for flexible installation. Features include HACR and HID ratings.Specifications
| Brand | Siemens |
|---|---|
| Series | BQD |
| Amperage | 45A |
| 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 | 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 Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, HID, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Reverse Feed, Non-Interchangeable Trip |
Product FAQs
6 answersWhat panelboards are compatible with the Siemens BQD145?
The BQD145 is a bolt-on circuit breaker designed specifically for use in Siemens commercial panelboards, including the P1, P2, P3, P4, and P5 series. It is not compatible with standard residential load centers.
Can I install the BQD145 in a standard Siemens residential load center?
No. The BQD145 is a commercial bolt-on breaker and will not fit in standard Siemens residential load centers, such as the EQ, PL, PN, or SN series. Those panels typically require plug-on QP or QT type breakers.
What wire sizes are accepted by the lugs on the BQD145?
The load side lugs on this 45A breaker accept 8 to 1 AWG copper wire, or 6 to 1/0 AWG aluminum wire. Always ensure connections are torqued to the manufacturer specifications printed on the breaker label during installation.
Is the BQD145 suitable for DC voltage applications?
Yes, this breaker is rated for use in DC systems up to 125VDC, where it provides an interrupting capacity of 14kA. This makes it suitable for specific control circuits, battery backups, and industrial DC applications.
Is there a DIN rail mount equivalent for the BQD145?
Yes. If your application requires a DIN rail mounted or cable-in/cable-out version of this breaker, you should use the Siemens CQD series, specifically the CQD145. The BQD series is strictly for bolt-on panelboard mounting.
What type of trip mechanism does the BQD145 use?
It utilizes a non-interchangeable, fixed thermal magnetic trip unit. The thermal component protects against prolonged overloads, while the magnetic instantaneous function protects against severe short circuits.
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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.
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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.