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Siemens LGB2B100B Molded Case Circuit Breaker
- 100A
- 2 Pole
- Bolt-On
Siemens
LGB2B100B
Molded Case Circuit Breaker
Brand
Siemens
SKU
LGB2B100B
Quantity
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Siemens LGB2B100B - 100A 2 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial applications, the Siemens LGB2B100B is a 2-pole molded case circuit breaker. It features thermal-magnetic trip technology for reliable long-time and instantaneous protection. This unit mounts into Siemens P1, P2, and P3 panelboards using a secure bolt-on connection. For legacy upgrades, it is replaced by the 3VA5110-6EC21-0AA0 (requires a mounting strap kit). Rated for 65kAIC at 480Y/277V, it handles high-fault currents and supports reverse feed applications.Specifications
| Brand | Siemens |
|---|---|
| Part Number | LGB2B100B |
| Series | LGB |
| Amperage | 100A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC, 600Y/347VAC, 125/250VDC |
| Phase | 1 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 14kA @ 600Y/347VAC, 14kA @ 125/250VDC |
| Frame Type | LGB |
|---|---|
| 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 |
| 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, Padlock Attachment |
|---|---|
| Accessories | Load Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CE, CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip, Quick-Make/Quick-Break, Trip-Free Mechanism, Common Trip |
Product FAQs
7 answersWhich Siemens panelboards are compatible with the LGB2B100B?
This bolt-on molded case circuit breaker is designed specifically for installation in Siemens P1, P2, and P3 series panelboards.
Is the LGB2B100B suitable for reverse feed applications?
Yes, this breaker is rated for reverse feed applications, allowing it to be back-fed when used as a main or sub-feed breaker in compatible panels.
What wire sizes are accepted by the load side lugs?
The factory-installed load lugs accept 8 to 1/0 AWG copper conductors or 8 to 2/0 AWG aluminum conductors. Always verify the required torque specifications printed on the breaker label during installation.
Does this breaker include line-side lugs?
No, as a bolt-on panelboard breaker, it connects directly to the panel bus on the line side. It only includes lugs on the load side.
Can this 2-pole breaker be used in DC circuits?
Yes, the LGB2B100B carries a DC interrupting rating of 14kA at 125/250VDC, making it suitable for specific direct current applications alongside its standard AC ratings.
Are the trip settings adjustable on the LGB2B100B?
No, this breaker features a fixed thermal and fixed magnetic trip unit. Both the long-time overload and instantaneous short-circuit functions are factory set and cannot be adjusted in the field.
What frame family does the LGB2B100B belong to?
It is part of the Siemens GB/GG frame family. When replacing existing breakers, ensure your panel spacing and bus connections match the LGB frame footprint.
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