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Siemens BQ3B050 Molded Case Circuit Breaker
- 50A
- 3 Pole
- Bolt-On
Siemens
BQ3B050
Molded Case Circuit Breaker
Brand
Siemens
SKU
BQ3B050
Quantity
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Siemens BQ3B050 - 50A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Siemens BQ3B050 - 50A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | BQ3B050 |
| Series | BQ |
| Amperage | 50A |
| 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 Panelboards, ITE 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, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
Sold out
Quantity
Siemens BQ3B050 - 50A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | BQ3B050-R |
| Series | BQ |
| Amperage | 50A |
| 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 Panelboards, ITE 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, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
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Description
Built for robust commercial applications, the Siemens BQ3B050 is a 3-pole, 50A molded case circuit breaker. It provides dependable power distribution and circuit protection for industrial facilities. The unit mounts into Siemens P1 and older ITE panelboards, offering a secure bolt-on connection that resists vibration. Rated at 10kAIC at 240VAC, it features fixed thermal-magnetic trip technology and load side lugs to safely clear electrical faults and maintain system integrity.Specifications
| Brand | Siemens |
|---|---|
| Part Number | BQ3B050 |
| Series | BQ |
| Amperage | 50A |
| 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 Panelboards, ITE 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, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
Product FAQs
6 answersCan the Siemens BQ3B050 replace older ITE BQ3B050 circuit breakers?
Yes, Siemens acquired the ITE electrical product line. The Siemens BQ3B050 is the direct, manufacturer-approved replacement for the legacy ITE BQ3B050 and fits exactly into the same panelboard chassis.
Which panelboards are compatible with the BQ3B050 breaker?
This breaker is approved for use in Siemens P1 panelboards as well as legacy ITE bolt-on panelboards. It uses a standard bolt-on mounting configuration to attach securely directly to the panel busbars.
Is the Siemens BQ3B050 breaker HACR rated?
Yes, this 50-amp breaker carries a standard HACR rating. This certification means it is tested and approved for safely protecting heating, air conditioning, and refrigeration equipment circuits.
Does the Siemens BQ3B050 come with load-side lugs?
Yes, this circuit breaker includes factory-installed load-side lugs. They accept both copper and aluminum conductors, accommodating wire sizes from 8 to 1 AWG for copper, or 6 to 1/0 AWG for aluminum wire.
What does the LI trip function code on the BQ3B050 represent?
The LI designation indicates Long-Time and Instantaneous trip functions. The fixed thermal-magnetic trip unit uses a bimetallic element for Long-Time overload protection and a magnetic coil to provide Instantaneous short-circuit protection.
What are the specific safety guidelines for mounting a bolt-on breaker like the BQ3B050?
Always ensure the main power to the panelboard is completely de-energized and locked out before installation. After confirming zero voltage, ensure you apply the manufacturer specified torque to the busbar mounting bolts to prevent loose connections that can cause arcing or overheating.
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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.