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Siemens NGB2B100B Molded Case Circuit Breaker
- 100A
- 2 Pole
- Bolt-On
Siemens
NGB2B100B
Molded Case Circuit Breaker
Brand
Siemens
SKU
NGB2B100B
Quantity
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Siemens NGB2B100B - 100A 2 Pole Molded Case Circuit Breaker
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Description
Engineered for high-capacity commercial panels, this 2-pole, 100A molded case circuit breaker delivers robust overcurrent defense. The NGB2B100B utilizes a fixed thermal-magnetic trip mechanism for precise long-time and instantaneous (LI) protection. It fastens securely into Siemens P1, P2, and P3 panelboards via a bolt-on connection. Boasting a 100 kAIC rating at 240VAC and 25 kAIC at 480Y/277VAC, this HACR-rated unit is a dependable choice. It is replaced by the 3VA51 series with a strap kit.Specifications
| Brand | Siemens |
|---|---|
| Series | NGB |
| Amperage | 100A |
| 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 | #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, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, HACR, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Trip-Free Mechanism |
Product FAQs
7 answersWhich Siemens panelboards accept the NGB2B100B circuit breaker?
The NGB2B100B is a bolt-on breaker specifically designed for installation in Siemens P1, P2, and P3 panelboards.
What frame group does the NGB2B100B belong to?
This breaker is part of the Siemens GB/GG frame group, which determines its physical footprint and hardware requirements for panelboard mounting.
What wire sizes and materials are supported by the load lugs on the NGB2B100B?
The factory-installed load lugs (kit 3TA1EG10) accept #14 through 1/0 AWG wire and are rated for both copper and aluminum conductors.
How are the line and load connections configured on the NGB2B100B?
The line side features a bolt-on connection that mounts directly to the panelboard bus, while the load side is equipped with mechanical lugs for wire termination.
Is the NGB2B100B suitable for direct current (DC) systems?
Yes, in addition to its AC ratings, this breaker is rated for use in DC systems up to 125/250VDC, providing a 14 kAIC interrupting capacity.
What type of protection does the thermal-magnetic trip unit provide?
The fixed thermal-magnetic trip unit delivers standard LI protection, combining a thermal element for long-time overload protection and a magnetic element for instantaneous short-circuit protection.
What is the recommended replacement series for the NGB2B100B?
Siemens is transitioning the NGB frame to the newer 3VA51 series. Installing a 3VA51 replacement in an existing P1, P2, or P3 panelboard requires an adapter strap kit.
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