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Siemens NGB2B090B Molded Case Circuit Breaker
- 90A
- 2 Pole
- Bolt-On
Siemens
NGB2B090B
Molded Case Circuit Breaker
Brand
Siemens
SKU
NGB2B090B
Quantity
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Siemens NGB2B090B - 90A 2 Pole Molded Case Circuit Breaker
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Description
Built for commercial and industrial distribution, the NGB2B090B is a 2-pole, 90A molded case circuit breaker from the SENTRON family. It features a fixed thermal-magnetic trip unit providing long-time and instantaneous (LI) protection. Designed to mount into Siemens P1, P2, and P3 panelboards, it delivers a high 100 kAIC interrupting rating at 240VAC. This HACR-rated breaker supports reverse feed applications and is officially replaced by the newer 3VA51 series (requires a mounting strap kit).Specifications
| Brand | Siemens |
|---|---|
| Series | NGB |
| Amperage | 90A |
| 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, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed |
Product FAQs
6 answersWhich Siemens panelboards are compatible with the NGB2B090B circuit breaker?
This bolt-on breaker is designed for installation in Siemens P1, P2, and P3 panelboards.
What are the acceptable wire sizes for the lugs on this 90A NGB breaker?
The factory lugs accept 8 to 1/0 AWG copper (Cu) conductors or 8 to 2/0 AWG aluminum (Al) conductors.
How does the interrupting rating scale across different AC voltages for this breaker?
The NGB2B090B provides 100kAIC at 240VAC, drops to 25kAIC at 480VAC or 277VAC, and offers 14kAIC at 600VAC or 347VAC.
Can the NGB2B090B be utilized in DC voltage applications?
Yes, this thermal magnetic breaker is rated for 125/250VDC systems with a maximum interrupting capacity of 14kAIC.
Are the thermal and magnetic trip settings adjustable on the NGB2B090B?
No, this breaker features fixed thermal and fixed magnetic trip elements for its long-time and instantaneous (LI) protection functions.
What frame family does the NGB2B090B belong to?
It is part of the Siemens SENTRON series, specifically falling under the NGB frame designation within the broader GB and GG frame group.
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