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Siemens NEB2B050B Molded Case Circuit Breaker
- 50A
- 2 Pole
- Bolt-On
Siemens
NEB2B050B
Molded Case Circuit Breaker
Brand
Siemens
SKU
NEB2B050B
Quantity
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Siemens NEB2B050B - 50A 2 Pole Molded Case Circuit Breaker
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Description
Built for industrial power systems, the Siemens NEB2B050B delivers 50A of thermal-magnetic protection. This 2-pole MCCB utilizes fixed long-time and instantaneous trip settings to defend against overloads and short circuits in demanding environments. The breaker fastens into Siemens P1, P2, and P3 panelboards. If replacing this legacy frame, the 3VA4150-6ED24-0AA0 serves as the modern substitute when paired with a 3VA41 mounting kit. It features an 85kAIC rating at 240V and is HACR rated.Specifications
| Brand | Siemens |
|---|---|
| Part Number | NEB2B050B |
| Series | NEB |
| Amperage | 50A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600Y/347VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 85kA @ 240VAC, 35kA @ 480VAC, 22kA @ 600Y/347VAC, 35kA @ 250VDC |
| Frame Type | NEB |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3 Panelboards |
| Wire Gauge | 8-1/0 AWG (Cu/Al) |
| Max Wire | 1/0 AWG |
| 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, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CE, CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Non-Interchangeable Trip |
Product FAQs
6 answersWhich panelboards accept the NEB2B050B circuit breaker?
The NEB2B050B is designed for bolt-on installation in Siemens P1, P2, and P3 series panelboards. Depending on the specific panelboard generation and configuration, a dedicated branch mounting hardware kit, such as the BBKEB32, may be required to properly secure the breaker to the bus.
What are the lug wire size limits for the NEB2B050B?
The factory-installed load lugs accommodate 8 to 1/0 AWG copper or aluminum (Cu/Al) conductors. Installers must verify the exact torque specifications printed on the breaker label, as torque values vary depending on the specific wire gauge used.
What is the difference between Siemens NEB and HEB frame circuit breakers?
Both NEB and HEB breakers share the exact same physical dimensions and mount in the same Siemens panelboards, but they differ in their short circuit interrupting ratings. The NEB frame provides standard interrupting capacity, while the HEB frame offers a higher interrupting capacity for systems with higher available fault currents.
Is the NEB2B050B rated for direct current (DC) applications?
Yes, this breaker is UL listed for use in DC systems up to 250VDC. This makes it suitable for specific industrial control, battery, or transit applications requiring reliable DC overcurrent protection.
Is the Siemens NEB2B050B suitable for reverse feeding?
Yes, Siemens NEB frame molded case circuit breakers feature a non-interchangeable thermal-magnetic trip unit and do not have dedicated Line and Load terminal markings. This makes them suitable for reverse feed applications, including solar backfeeding setups.
What is the modern replacement for the legacy NEB2B050B circuit breaker?
For future upgrades or replacements of this legacy NEB frame, Siemens offers the 3VA4150-6ED24-0AA0 as the modern substitute. Note that installing the newer 3VA series breaker in an existing panel will require a compatible 3VA41 mounting strap kit.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 3 reviews.
Total 5 star reviews: 3 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
3 reviews
- JLJeremy L.ReviewingSiemens NEB3B125B - 125A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/17/18The right product with great
The right product with great packaging and shipping
- JLJeremy L.ReviewingSiemens NEB3B030B - 30A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars11/26/17Great breaker. Best price and
Great breaker. Best price and fast service
- DBDan B.ReviewingSiemens NEB3B035B - 35A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars5/26/17Siemens NEB
Customer is happy.