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Siemens NGB3B050 Molded Case Circuit Breaker
- 50A
- 3 Pole
- Bolt-On
Siemens
NGB3B050
Molded Case Circuit Breaker
Brand
Siemens
SKU
NGB3B050
Quantity
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Siemens NGB3B050 - 50A 3 Pole Molded Case Circuit Breaker
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Description
Providing 100 kAIC of interrupting capacity at 240V, this 50A molded case circuit breaker features a nut keeper assembly instead of standard load lugs. The Siemens NGB3B050 is HACR and HID rated, making it ideal for specialized commercial lighting and HVAC applications. Designed for seamless integration, this 3-pole breaker mounts into Siemens P1, P2, P3, P4, and P5 panelboards. It utilizes fixed thermal-magnetic trip units for reliable LI protection. Replaced by the 3VA5150-5ED31-0AA0.Specifications
| Brand | Siemens |
|---|---|
| Series | NGB |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC, 600Y/347VAC, 125/250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 25kA @ 480Y/277VAC, 14kA @ 600Y/347VAC, 14kA @ 125/250VDC |
| Frame Type | GG |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3, P4, P5 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 | Nut Keeper (No Lugs) |
| Standards | CSA C22.2 No. 5, UL 489, NEMA AB 1 |
| Approval | CSA, HACR, HID, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed |
Product FAQs
6 answersWhich Siemens panelboards are compatible with the NGB3B050 circuit breaker?
This bolt-on breaker is designed for use in Siemens P1, P2, P3, P4, and P5 panelboards.
What wire sizes and materials do the lugs on the NGB3B050 accept?
The factory-installed lugs accept 8 to 1/0 AWG copper (Cu) wire or 8 to 2/0 AWG aluminum (Al) wire.
Can the NGB3B050 be used in DC voltage applications?
Yes, this breaker is rated for 125/250V DC systems with an interrupting capacity of 14kAIC.
Are there higher interrupting rating alternatives to the NGB3B050?
Yes, the Siemens HGB and LGB series share the same physical GB frame but offer higher interrupting ratings. The HGB provides 35kAIC at 480V, and the LGB provides 65kAIC at 480V, compared to the 25kAIC rating of the NGB.
What type of trip mechanism does the NGB3B050 utilize?
It features a thermal-magnetic trip unit with fixed long-time and instantaneous (LI) trip functions to protect against overloads and short circuits.
How does the NGB3B050 mount into the panelboard?
It is a bolt-on circuit breaker that secures directly to the panelboard bus using bolted connections, ensuring a stable and reliable electrical contact under load.
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