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Siemens NGB2B110B Molded Case Circuit Breaker
- 110A
- 2 Pole
- Bolt-On
Siemens
NGB2B110B
Molded Case Circuit Breaker
Brand
Siemens
SKU
NGB2B110B
Quantity
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Siemens NGB2B110B - 110A 2 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial power distribution, the Siemens NGB2B110B is a 2-pole, 110A molded case circuit breaker featuring fixed thermal-magnetic trip units for dependable LI protection. This bolt-on MCCB mounts into Siemens P1, P2, and P3 panelboards. For legacy system upgrades, it is replaced by the 3VA5111-4ED21-0AA0, which requires a strap kit for proper installation. Rated at 100kAIC at 240VAC, this HACR-rated breaker supports reverse feed applications and accepts 8-1/0 AWG copper wire.Specifications
| Brand | Siemens |
|---|---|
| Series | NGB |
| Amperage | 110A |
| 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, 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 NGB2B110B?
This bolt-on breaker is designed for use in Siemens P1, P2, and P3 lighting and distribution panelboards. It mounts directly to the panelboard bus structure.
What wire sizes are accepted by the factory lugs on this breaker?
The standard lugs accept 8 AWG to 1/0 AWG copper conductors or 8 AWG to 2/0 AWG aluminum conductors. Always apply the specific torque value printed on the breaker faceplate during installation.
Is the NGB2B110B rated for direct current (DC) systems?
Yes, this breaker is rated for DC applications up to 125/250VDC with an interrupting capacity of 14kAIC, making it suitable for specific industrial control or battery backup circuits.
How does the NGB frame compare to HGB or LGB breakers?
The NGB, HGB, and LGB series share the exact same physical footprint and panelboard compatibility. They differ only in interrupting ratings. The NGB is the standard interrupting tier, while HGB and LGB offer higher fault current ratings for systems with higher available fault currents.
Can the trip settings on the NGB2B110B be adjusted in the field?
No, this breaker features a thermal magnetic trip unit with fixed long-time and fixed instantaneous trip functions. It does not have field-adjustable dials.
Can this breaker be used as a back-fed main breaker?
Yes, it can be used as a main or branch breaker depending on the panelboard configuration. When installed as a back-fed main, a dedicated hold-down kit is required to comply with National Electrical Code (NEC) standards.
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