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Siemens NEB2B040B Molded Case Circuit Breaker
- 40A
- 2 Pole
- Bolt-On
Siemens
NEB2B040B
Molded Case Circuit Breaker
Brand
Siemens
SKU
NEB2B040B
Quantity
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Siemens NEB2B040B - 40A 2 Pole Molded Case Circuit Breaker
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Description
Designed to integrate into Siemens P1, P2, P3, P4, and P5 panelboards, the NEB2B040B is a 40A, 2-pole molded case circuit breaker. This bolt-on MCCB from the SENTRON family offers fixed thermal and magnetic trip functions for precise overcurrent response. With an interrupting capacity of 35kA at 480VAC and 85kA at 240VAC, it easily handles industrial demands. The HACR and HID rated breaker is a direct predecessor to the newer 3VA4140-5ED24-0AA0 replacement model.Specifications
| Brand | Siemens |
|---|---|
| Part Number | NEB2B040B |
| Series | NEB |
| Amperage | 40A |
| 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, P4, P5 Panelboards |
| Wire Gauge | 14-1/0 AWG (Cu/Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Undervoltage Release, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs (TA1EG10) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated |
Product FAQs
8 answersWhich Siemens panelboards are compatible with the NEB2B040B breaker?
This bolt-on breaker is designed for use in Siemens SENTRON P1, P2, P3, P4, and P5 commercial panelboards. Appropriate mounting hardware or strap kits may be required depending on your specific panelboard configuration.
Can I install this breaker in a standard residential load center?
No. The NEB2B040B is a bolt-on molded case circuit breaker built for commercial and industrial panelboards. It will not fit into standard residential plug-on load centers.
What wire sizes are accepted by the terminal lugs on this breaker?
The factory-installed lugs accept wire gauges from 14 AWG up to 1/0 AWG. The terminals are rated for both copper (Cu) and aluminum (Al) conductors, providing flexibility for field wiring.
Can the NEB2B040B be used in direct current (DC) systems?
Yes, this breaker is rated for DC applications. It provides a 35kA interrupting capacity at 250VDC, making it suitable for specific industrial DC control and distribution circuits.
How does the NEB frame compare to the HEB frame?
Both NEB and HEB breakers share the same physical dimensions and mounting requirements within the SENTRON family. The primary difference is the interrupting rating. HEB breakers offer higher fault current ratings compared to the standard NEB series.
What type of trip unit is installed in the NEB2B040B?
It features a non-interchangeable thermal-magnetic trip unit with fixed long-time and fixed instantaneous (LI) trip functions. This provides standard overload and short-circuit protection without adjustable dials.
Does this breaker require a specific mounting orientation?
Standard Siemens molded case circuit breakers can typically be mounted in any physical orientation (vertical or horizontal) without affecting the thermal-magnetic trip characteristics. Always verify with local codes and the panelboard enclosure labeling.
Is this breaker suitable for high-fault commercial environments?
With an interrupting rating of 85kA at 240VAC and 35kA at 480VAC, it is well-suited for many commercial and industrial systems. Always ensure the available fault current at the installation point does not exceed these ratings to maintain system safety.
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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.