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Siemens BQ3B045H Molded Case Circuit Breaker
- 45A
- 3 Pole
- Bolt-On
Siemens
BQ3B045H
Molded Case Circuit Breaker
Brand
Siemens
SKU
BQ3B045H
Quantity
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Siemens BQ3B045H - 45A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial and industrial power distribution, the Siemens BQ3B045H is a 3-pole, 45A molded case circuit breaker. It features a bolt-on mounting design that ensures a secure connection in demanding environments. This breaker installs into Siemens P1 and legacy ITE panelboards, serving as a reliable solution for system upgrades. Delivering a high interrupting capacity of 22kA at 240VAC, it utilizes thermal-magnetic trip technology to protect against overloads and short circuits.Specifications
| Brand | Siemens |
|---|---|
| Part Number | BQ3B045H |
| Series | BQ |
| Amperage | 45A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 22kA @ 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
7 answersWhich panelboards accept the Siemens BQ3B045H circuit breaker?
The BQ3B045H is a bolt-on breaker designed for installation in Siemens P1 panelboards. It is also backward compatible with legacy ITE panelboards that require BQ-frame bolt-on breakers.
What does the H suffix in the BQ3B045H catalog number indicate?
The H suffix designates this as a high-interrupting capacity breaker, often referred to as a BQH type. It provides a 22kAIC rating at 240VAC, which is higher than the 10kAIC rating found on standard BQ breakers.
What are the acceptable wire gauges for the BQ3B045H terminals?
The included load-side lugs accept 8 to 1 AWG copper conductors, or 6 to 1/0 AWG aluminum conductors. Ensure proper torque specifications are followed during installation.
Does the BQ3B045H plug into the busbar or bolt on?
The BQ3B045H is a bolt-on circuit breaker. It fastens directly to the panelboard busbar with screws, which provides a highly secure mechanical and electrical connection for commercial applications.
How does the thermal-magnetic trip unit operate on the BQ3B045H?
The breaker uses a fixed thermal-magnetic mechanism with Long-Time and Instantaneous (LI) functions. The thermal element responds to sustained overloads by heating and tripping the breaker, while the magnetic element responds immediately to high-fault short circuits.
Is the Siemens BQ3B045H a direct replacement for older ITE breakers?
Yes. Siemens acquired ITE, and the BQ3B045H serves as the direct replacement for legacy 45A, 3-pole, 240V ITE bolt-on breakers that share the same BQ frame and interrupting capacity requirements.
Is the Siemens BQ3B045H HACR rated?
Yes, this breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment that requires a 45A, 3-pole overcurrent protection device.
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