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Siemens NGB2B125B Molded Case Circuit Breaker
- 125A
- 2 Pole
- Bolt-On
Siemens
NGB2B125B
Molded Case Circuit Breaker
Brand
Siemens
SKU
NGB2B125B
Quantity
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Siemens NGB2B125B - 125A 2 Pole Molded Case Circuit Breaker
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Description
Operating within the SENTRON family, the Siemens NGB2B125B is a 2-pole, 125A molded case circuit breaker. It provides dependable thermal-magnetic protection for commercial systems. Featuring a bolt-on mounting style, this breaker fits Siemens P1, P2, and P3 panelboards. It serves as an exact replacement for legacy NGB frames prior to the 3VA51 series transition. With an interrupt capacity of 100kAIC at 240VAC, it meets stringent requirements and supports reverse feed configurations.Specifications
| Brand | Siemens |
|---|---|
| Part Number | NGB2B125B-R |
| Series | NGB |
| Amperage | 125A |
| 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 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, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed |
Product FAQs
5 answersWhich Siemens panelboards are compatible with the NGB2B125B?
This bolt-on breaker is designed for use in Siemens Type P1, P2, and P3 commercial panelboards. It can also be used to replace legacy BQD breakers that occupy the same panelboard spaces.
Does the NGB2B125B include line-side lugs?
No, this is a strictly bolt-on breaker. The line side features mounting tabs that bolt directly to the panelboard bus, while the load side includes mechanical lugs for wire termination.
What is the difference between Siemens NGB, HGB, and LGB circuit breakers?
These three series share the exact same physical footprint and panelboard compatibility. The NGB represents the standard interrupting tier, while the HGB and LGB frames are used in applications requiring high or extra-high short-circuit interrupting ratings.
Are the trip settings adjustable on the NGB2B125B?
No, this breaker features a fixed thermal and fixed magnetic trip unit. Neither the long-time overload nor the instantaneous short-circuit pickup levels can be adjusted in the field.
Does this breaker provide GFCI or AFCI protection?
No, the NGB2B125B features a standard thermal-magnetic trip unit with long-time and instantaneous (LI) functions. It provides overload and short-circuit protection but does not include ground fault or arc fault circuitry.
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