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Siemens BQ2B045H Molded Case Circuit Breaker
- 45A
- 2 Pole
- Bolt-On
Siemens
BQ2B045H
Molded Case Circuit Breaker
Brand
Siemens
SKU
BQ2B045H
Quantity
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Siemens BQ2B045H - 45A 2 Pole Molded Case Circuit Breaker
New
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Siemens BQ2B045H - 45A 2 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | BQ2B045H |
| Series | BQH |
| Amperage | 45A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 22kA @ 120/240VAC |
| Frame Type | BQ |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Panelboards (P1, P2, P3, P4, P5) |
| 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 | Padlock Attachment, Handle Tie |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Non-Interchangeable Trip, High Interrupting Capacity |
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Siemens BQ2B045H - 45A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | BQ2B045H-R |
| Series | BQH |
| Amperage | 45A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 22kA @ 120/240VAC |
| Frame Type | BQ |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Panelboards (P1, P2, P3, P4, P5) |
| 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 | Padlock Attachment, Handle Tie |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Non-Interchangeable Trip, High Interrupting Capacity |
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Description
Part of the BQH series, this 45-amp molded case circuit breaker offers upgraded fault protection for commercial facilities. It features a high interrupting capacity of 22kA at 120/240VAC, providing an extra margin of safety for systems with higher available fault currents. The bolt-on configuration ensures a secure connection within Siemens P1, P2, P3, P4, and P5 panelboards.Specifications
| Brand | Siemens |
|---|---|
| Part Number | BQ2B045H |
| Series | BQH |
| Amperage | 45A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 22kA @ 120/240VAC |
| Frame Type | BQ |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Panelboards (P1, P2, P3, P4, P5) |
| 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 | Padlock Attachment, Handle Tie |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Non-Interchangeable Trip, High Interrupting Capacity |
Product FAQs
7 answersWhich panelboards are compatible with the BQ2B045H?
This breaker is designed for Siemens P1, P2, P3, P4, and P5 commercial panelboards. It mounts directly to the panel busbar using a bolt-on connection, making it suitable for lighting and distribution applications.
What is the difference between the BQ2B045 and the BQ2B045H?
The H suffix indicates a higher interrupting capacity. The BQ2B045H provides a 22kAIC rating at 240VAC, while the standard BQ2B045 offers a 10kAIC rating. Both share the same physical dimensions and bolt-on mounting.
Can I use aluminum wire with the BQ2B045H?
Yes, the terminal lugs are rated for both copper and aluminum conductors. They accept 8 to 1 AWG copper wire or 6 to 1/0 AWG aluminum wire.
Does the BQ2B045H fit in standard residential load centers?
No. This is a bolt-on breaker designed specifically for Siemens commercial panelboards. Standard residential load centers typically require plug-on breakers rather than bolt-on models.
What does the LI trip function on this breaker mean?
LI stands for Long-Time and Instantaneous trip functions. The Long-Time function provides delayed overload protection when the current exceeds the breaker rating, while the Instantaneous function trips immediately to protect against short circuits.
Can this breaker be used on a 120V circuit?
Yes. While it has a maximum voltage rating of 240VAC, it is fully compatible with 120VAC systems. It maintains its 22kAIC interrupting rating at both voltages.
Can I adjust the trip settings on the BQ2B045H?
No, this thermal magnetic breaker features fixed trip settings for both the Long-Time and Instantaneous functions. It cannot be field-adjusted.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
Total 5 star reviews: 2 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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2 reviews
- YRYoan R.Verified BuyerReviewingSiemens BQ2B125H - 125A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/19/26Best prices and quality 🫶
Best prices and quality 🫶
- JDJames D.ReviewingSiemens BQ2B030H - 30A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars11/13/17shop manager
thanks for the fast accurate service