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Siemens NEB2B045B Molded Case Circuit Breaker
- 45A
- 2 Pole
- Bolt-On
Siemens
NEB2B045B
Molded Case Circuit Breaker
Brand
Siemens
SKU
NEB2B045B
Quantity
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Siemens NEB2B045B - 45A 2 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial distribution, the Siemens NEB2B045B provides reliable thermal-magnetic protection for 45A circuits. This 2-pole breaker features fixed long-time and instantaneous trip functions to safeguard infrastructure. It mounts into Siemens P1 through P5 panelboards via a secure bolt-on connection. For facility upgrades, this unit is replaced by the 3VA5145-5ED21-0AA0 (requires mounting kit). Rated 35kAIC at 480V, it is HACR and HID rated for specialized applications.Specifications
| Brand | Siemens |
|---|---|
| Part Number | NEB2B045B |
| Series | NEB |
| Amperage | 45A |
| 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, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| 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, Reverse Feed, Non-Interchangeable Trip, Trip-Free Mechanism |
Product FAQs
6 answersWhich panelboards accept the Siemens NEB2B045B circuit breaker?
This bolt-on breaker is designed for installation in Siemens P1, P2, P3, P4, and P5 commercial panelboards. It secures directly to the bus bar for a stable, vibration-resistant connection.
Can the NEB2B045B be installed in a standard residential load center?
No. This is a bolt-on breaker engineered specifically for commercial and industrial panelboards. It will not fit in plug-on residential load centers such as the Siemens SN or PN series.
What wire sizes are compatible with the load lugs on this breaker?
The included load-side lugs accept 14 AWG through 1/0 AWG copper or aluminum conductors. Always refer to the breaker faceplate for specific torque requirements during installation.
Is the NEB2B045B suitable for direct current (DC) systems?
Yes, in addition to its AC ratings, this thermal-magnetic breaker is rated for 250VDC applications with a 35kA interrupting capacity.
What trip functions are included in the NEB2B045B?
It features a fixed thermal-magnetic trip unit providing long-time and instantaneous (LI) protection. The thermal and magnetic trip settings are factory fixed and cannot be adjusted in the field.
What is the difference between Siemens NEB and HEB frame breakers?
Both utilize the same physical frame size and bolt-on mounting for P-series panelboards, but HEB breakers offer a higher interrupting capacity (AIC rating) than the standard NEB frame.
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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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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.