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Siemens NGB1B045B Molded Case Circuit Breaker
- 45A
- 1 Pole
- Bolt-On
Siemens
NGB1B045B
Molded Case Circuit Breaker
Brand
Siemens
SKU
NGB1B045B
Quantity
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Siemens NGB1B045B - 45A 1 Pole Molded Case Circuit Breaker
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Description
A reliable solution for commercial power, the Siemens NGB1B045B is a 45A, single-pole MCCB. It features a trip-free mechanism and standard long-time/instantaneous protection. This bolt-on breaker is engineered to fit Siemens P1 through P5 panelboards. It is officially succeeded by the 3VA5145-4ED16-0AA0, which requires a mounting kit for P1-P3 panels. Capable of handling 347VAC at 14kAIC, it also delivers 100kAIC at 120VAC. The unit is HACR rated and supports reverse feed applications.Specifications
| Brand | Siemens |
|---|---|
| Part Number | NGB1B045B |
| Series | NGB |
| Amperage | 45A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 277VAC, 125VDC, 347VAC |
| Phase | 1 |
| AIC Rating | 100kA @ 120VAC, 25kA @ 277VAC, 14kA @ 125VDC, 14kA @ 347VAC |
| Frame Type | GG |
|---|---|
| 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, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs (3TC1GG20) |
| Standards | CSA C22.2 No. 5, UL 489, NEMA AB 1 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Trip-Free Mechanism |
Product FAQs
7 answersWhich Siemens panelboards are compatible with the NGB1B045B circuit breaker?
The NGB1B045B is a bolt-on circuit breaker designed specifically for use in Siemens Sentron lighting panelboards, including the P1, P2, P3, P4, and P5 series.
What wire sizes are accepted by the factory lugs on the NGB1B045B?
The standard lugs on this 45A breaker accept 8 AWG to 1/0 AWG copper conductors, or 8 AWG to 2/0 AWG aluminum conductors. Ensure proper torque is applied during installation as specified on the breaker label.
Can the NGB1B045B be used in DC voltage applications?
Yes, this 1-pole breaker is rated for use in DC circuits up to 125VDC, where it provides a 14kA interrupting capacity.
What is the difference between Siemens NGB and NGG circuit breakers?
Both belong to the Siemens G-Frame family and share the same internal thermal-magnetic trip mechanisms. However, the NGB is configured with a bolt-on line end specifically for panelboard mounting, while the NGG is designed for DIN rail or base mounting.
What type of trip unit is equipped on the NGB1B045B?
This breaker features a non-interchangeable thermal-magnetic trip unit with fixed long-time and instantaneous (LI) protection functions. It provides reliable overload and short-circuit protection without requiring field calibration.
Does this breaker require a separate mounting adapter for panelboard installation?
No, the NGB1B045B is designed to bolt directly to the bus of compatible Siemens P-series panelboards without the need for additional mounting plates or adapters.
Can NGB breakers be used with handle ties for multi-pole applications?
Yes, Siemens NGB single-pole breakers are approved for use with handle ties in applications where shared neutrals are present and the breakers must be locked out simultaneously.
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