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Siemens NGB3B125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
Siemens
NGB3B125
Molded Case Circuit Breaker
Brand
Siemens
SKU
NGB3B125
Quantity
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Siemens NGB3B125 - 125A 3 Pole Molded Case Circuit Breaker
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Description
Operating at 125 amps, this Sentron family device delivers essential long-time and instantaneous fault protection. The unit is HACR rated for heating and cooling equipment and allows for reverse-feed wiring configurations. This specific model features a nut keeper assembly rather than standard load lugs, accommodating specialized connection needs. It bolts into Siemens P1, P2, and P3 panelboards. Providing 25kAIC at 480Y/277VAC, it maintains high-performance safety for commercial systems.Specifications
| Brand | Siemens |
|---|---|
| Series | NGB |
| Amperage | 125A |
| 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 | 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, Lug Kit |
|---|---|
| Accessories | Nut Keeper |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CE, CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed |
Product FAQs
5 answersWhich Siemens panelboards are compatible with the NGB3B125?
This Sentron series bolt-on breaker is designed for direct installation in standard Siemens P1, P2, and P3 electrical panelboards.
How does the NGB frame compare to Siemens BQD circuit breakers?
While both share a similar compact footprint for Siemens lighting panels, the NGB series provides higher interrupting capacities, such as 25kA at 480Y/277V AC, and supports higher overall frame ratings up to 125A.
What wire material and gauge sizes do the NGB3B125 standard lugs accept?
The factory-installed lugs are dual-rated for both copper and aluminum conductors. They accept copper wire ranging from 8 to 1/0 AWG and aluminum wire from 8 to 2/0 AWG.
Can this circuit breaker be used for direct current applications?
Yes, in addition to standard alternating current voltages, the NGB3B125 is fully rated for 125/250V DC systems with a 14kA interrupting capacity.
Are the trip settings on the NGB3B125 adjustable?
No, this molded case circuit breaker features a non-adjustable, fixed thermal-magnetic trip unit configured for standard long-time and instantaneous overcurrent protection.
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