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Siemens NGB2B050B Molded Case Circuit Breaker
- 50A
- 2 Pole
- Bolt-On
Siemens
NGB2B050B
Molded Case Circuit Breaker
Brand
Siemens
SKU
NGB2B050B
Quantity
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Siemens NGB2B050B - 50A 2 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Siemens NGB2B050B - 50A 2 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | NGB2B050B |
| Series | NGB |
| Amperage | 50A |
| 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, HID, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Reverse Feed |
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Siemens NGB2B050B - 50A 2 Pole Molded Case Circuit Breaker
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Quantity
| Brand | Siemens |
|---|---|
| Series | NGB |
| Amperage | 50A |
| 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, HID, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Reverse Feed |
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Description
Built for demanding electrical systems, this 50A thermal-magnetic device provides reliable overcurrent protection. It features a 100kAIC interrupt rating at 240VAC and 25kAIC at 480Y/277VAC, making it suitable for commercial environments. The bolt-on design installs securely into Siemens P1, P2, and P3 panelboards. It serves as a robust component within the SENTRON family GB/GG frames. Standard features include HACR and HID ratings, along with reverse feed capabilities and factory load lugs.Specifications
| Brand | Siemens |
|---|---|
| Part Number | NGB2B050B |
| Series | NGB |
| Amperage | 50A |
| 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, HID, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Reverse Feed |
Product FAQs
7 answersWhat panelboards are compatible with the NGB2B050B circuit breaker?
This bolt-on breaker is specifically configured for the line-side mounting requirements of Siemens P1, P2, and P3 panelboards.
Are the factory lugs on the NGB2B050B rated for both copper and aluminum wire?
Yes, the included lugs are dual-rated. They accept 8 to 1/0 AWG copper (Cu) conductors and 8 to 2/0 AWG aluminum (Al) conductors.
Is the NGB2B050B suitable for direct current (DC) systems?
Yes, because it utilizes a fixed thermal-magnetic trip unit, it can be applied in DC systems. It carries a 14kA interrupting rating at 125/250VDC.
What is the difference between the Siemens NGB, HGB, and LGB circuit breakers?
The primary difference is their short-circuit interrupting ratings. The NGB is the standard tier (25kA at 480VAC), while the HGB and LGB models offer higher interrupting capacities within the same physical frame size.
Can the NGB2B050B be back-fed for use as a main breaker?
Yes, this breaker can be back-fed. When installing it as a main breaker in a Siemens P1 panelboard, you must use a compatible back-fed main breaker kit, such as the MBKBFA, to secure it properly.
Does the NGB2B050B provide ground fault or arc fault protection?
No, this is a standard thermal-magnetic circuit breaker equipped with long-time and instantaneous (LI) trip functions. It does not include GFCI or AFCI protection circuitry.
Can I adjust the trip settings on the NGB2B050B?
No, this breaker features a fixed thermal and fixed magnetic trip unit. The long-time and instantaneous trip functions are factory set and cannot be adjusted in the field.
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