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Siemens LGB1B050B Molded Case Circuit Breaker
- 50A
- 1 Pole
- Bolt-On
Siemens
LGB1B050B
Molded Case Circuit Breaker
Brand
Siemens
SKU
LGB1B050B
Quantity
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Siemens LGB1B050B - 50A 1 Pole Molded Case Circuit Breaker
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Description
Designed for heavy-duty commercial environments, this 50A, single-pole MCCB delivers consistent thermal-magnetic protection across 120V, 277V, and 347V systems. Installation is streamlined with a bolt-on mounting style tailored for Siemens P1, P2, and P3 panelboards. This GB/GG frame breaker is eventually replaced by the 3VA41 substitute. It boasts a 65kAIC interrupting capacity at 277V and includes a non-interchangeable trip with reverse feed capabilities.Specifications
| Brand | Siemens |
|---|---|
| Series | LGB |
| Amperage | 50A |
| Poles | 1 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 277VAC, 125VDC, 347VAC |
| Phase | 1 |
| AIC Rating | 100kA @ 120VAC, 65kA @ 277VAC, 14kA @ 125VDC, 14kA @ 347VAC |
| 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 |
|---|---|
| Accessories | Load Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CE, CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, High Interrupting Capacity, Reverse Feed, Non-Interchangeable Trip, Trip-Free Mechanism |
Product FAQs
6 answersWhich Siemens panelboards are compatible with the LGB1B050B circuit breaker?
This bolt-on breaker is designed for use in Siemens P1, P2, and P3 lighting and distribution panelboards.
What are the acceptable wire sizes and materials for the lugs on this breaker?
The factory-installed lugs accept 8 AWG to 1/0 AWG copper conductors or 8 AWG to 2/0 AWG aluminum conductors.
How does the interrupting rating change between 277VAC and 347VAC systems?
The breaker provides a 65kAIC rating at 277VAC, but the interrupting capacity drops to 14kAIC when applied to 347VAC systems. It also carries a maximum 100kAIC rating at 120VAC.
Is the LGB1B050B rated for direct current applications?
Yes, this breaker is rated for DC systems up to 125VDC with an interrupting capacity of 14kAIC.
What frame family does the LGB1B050B belong to?
It is part of the Siemens Sentron series, specifically the LGB frame which falls under the broader GB and GG frame group.
Does this breaker feature adjustable trip settings?
No, the thermal magnetic trip unit has fixed long time and fixed instantaneous trip functions.
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