Siemens BQ2B040QLD Molded Case Circuit Breaker
- 40A
- 2 Pole
- DIN Rail
Siemens
BQ2B040QLD
Molded Case Circuit Breaker
Brand
Siemens
SKU
BQ2B040QLD
Quantity
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Siemens BQ2B040QLD - 40A 2 Pole Molded Case Circuit Breaker
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40A 2 Pole Molded Case Circuit Breaker
40A 2 Pole Molded Case Circuit Breaker
Description
Built for commercial and industrial OEM panels, this 40-amp molded case circuit breaker utilizes a specialized DIN rail mounting system for flexible integration. It mounts easily into standard DIN enclosures without requiring dedicated panelboard hardware. The unit incorporates Insta-Wire technology on both line and load side lugs, significantly reducing installation time for contractors.Specifications
| Brand | Siemens |
|---|---|
| Series | BQ |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | DIN Rail |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | BQ |
|---|---|
| Terminal Type | Lugs |
| For Use With | DIN Rail Enclosures, OEM Panels |
| Wire Gauge | 16-6 AWG (Cu), 12-6 AWG (Al) |
| Max Wire | 6 AWG |
| Min Wire | 16 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 | Line and Load Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, NOM, UL |
| Temp Rating | 40C |
Product FAQs
5 answersHow is the Siemens BQ2B040QLD installed in an enclosure?
Unlike standard bolt-on BQ breakers, the BQ2B040QLD is a Type BQXD breaker designed specifically for DIN rail mounting. It snaps directly onto a standard DIN rail in compatible enclosures or OEM panels.
Are line and load lugs included with the BQ2B040QLD?
Yes, this breaker comes with factory-installed line and load side lugs. They accept 16 to 6 AWG copper conductors or 12 to 6 AWG aluminum conductors.
Is the BQ2B040QLD compatible with standard Siemens load centers?
No, this breaker is intended for DIN rail enclosures and OEM panels. It will not fit in standard residential or commercial load centers that require plug-on or standard bolt-on connections.
What does the QLD suffix indicate on this Siemens breaker?
The QLD suffix identifies this as a Type BQXD breaker, meaning it is modified for DIN rail mounting rather than standard panelboard installation.
What applications are suitable for the thermal-magnetic trip unit on this 40A breaker?
The fixed thermal-magnetic trip unit provides standard long-time and instantaneous (LI) protection, making it ideal for general purpose circuit protection in 120/240VAC OEM control panels.
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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 74 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
74 reviews
- DVDavid V. O.Verified BuyerReviewingSiemens BQ3B030H - 30A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars10/3/26Electrician
Came
fast
- 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.