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Siemens NGB2B045B Molded Case Circuit Breaker
- 45A
- 2 Pole
- Bolt-On
Siemens
NGB2B045B
Molded Case Circuit Breaker
Brand
Siemens
SKU
NGB2B045B
Quantity
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Siemens NGB2B045B - 45A 2 Pole Molded Case Circuit Breaker
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Description
Designed for heavy-duty commercial use, this 45A Siemens circuit breaker provides dependable overcurrent protection for up to 600Y/347VAC networks. The factory-installed load lugs streamline the wiring process for faster setup. This bolt-on MCCB mounts into Siemens P1, P2, P3, P4, and P5 panelboards. It is eventually replaced by the 3VA51 series, which requires a separate mounting kit. It boasts a 100kAIC rating at 240V, fixed thermal-magnetic trip functions, and reverse feed capability.Specifications
| Brand | Siemens |
|---|---|
| Part Number | NGB2B045B |
| Series | NGB |
| Amperage | 45A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC, 600Y/347VAC, 125/250VDC |
| Phase | 1 |
| AIC Rating | 100kA @ 240VAC, 25kA @ 480Y/277VAC, 14kA @ 600Y/347VAC, 14kA @ 125/250VDC |
| Frame Type | NGB |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3, P4, P5 Panelboards |
| Wire Gauge | 8-1/0 AWG (Cu), 8-2/0 AWG (Al) |
| Max Wire | 1/0 AWG (Cu), 2/0 AWG (Al) |
| Min Wire | 8 AWG |
| 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 Lugs |
| Standards | CSA C22.2 No. 5, UL 489, NEMA AB 1 |
| Approval | CSA, HACR, HID, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed |
Product FAQs
5 answersWhat panelboards are compatible with the NGB2B045B breaker?
This bolt-on breaker is designed for installation in Siemens P1, P2, P3, P4, and P5 panelboards. It secures directly to the bus for commercial and industrial distribution applications.
What wire sizes do the factory lugs on the NGB2B045B accept?
The included lugs accommodate 8 AWG to 1/0 AWG copper conductors, or 8 AWG to 2/0 AWG aluminum conductors. Ensure proper torque specifications are followed during installation.
Is the NGB2B045B suitable for direct current (DC) systems?
Yes, in addition to standard AC ratings, this thermal magnetic breaker is rated for DC applications up to 125/250VDC, providing a 14kA interrupting capacity for those circuits.
Can I adjust the trip settings on this 45A breaker?
No, the NGB2B045B features fixed thermal and fixed magnetic trip elements. The long time and instantaneous protection parameters are factory set and cannot be modified in the field.
What frame family does the NGB2B045B belong to?
This breaker is part of the Siemens SENTRON series. It utilizes the NGB frame design, which falls under the broader GB and GG frame group used in modern Siemens distribution equipment.
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