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Siemens LGB3B125B Molded Case Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
Siemens
LGB3B125B
Molded Case Circuit Breaker
Brand
Siemens
SKU
LGB3B125B
Quantity
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Siemens LGB3B125B - 125A 3 Pole Molded Case Circuit Breaker
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Siemens LGB3B125B - 125A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | LGB3B125B |
| Series | LGB |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC, 600Y/347VAC, 125/250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 14kA @ 600Y/347VAC, 14kA @ 125/250VDC |
| 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, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Low Tab, Reverse Feed, Trip-Free Mechanism, Non-Interchangeable Trip |
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Siemens LGB3B125B - 125A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | LGB3B125B |
| Series | LGB |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC, 600Y/347VAC, 125/250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 14kA @ 600Y/347VAC, 14kA @ 125/250VDC |
| 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, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Low Tab, Reverse Feed, Trip-Free Mechanism, Non-Interchangeable Trip |
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Description
Built for commercial and industrial distribution, the Siemens LGB3B125B provides robust thermal-magnetic protection with a 125A rating. This 3-pole Sentron series breaker features a high interrupting capacity of 65 kAIC at 480Y/277V and is fully HACR rated for HVAC applications. It installs into Siemens P1, P2, and P3 panelboards using a secure bolt-on connection. Note that this legacy GB-frame model is officially replaced by the newer 3VA5112-6ED31-0AA0 for future system upgrades.Specifications
| Brand | Siemens |
|---|---|
| Part Number | LGB3B125B |
| Series | LGB |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC, 600Y/347VAC, 125/250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 14kA @ 600Y/347VAC, 14kA @ 125/250VDC |
| 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, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Low Tab, Reverse Feed, Trip-Free Mechanism, Non-Interchangeable Trip |
Product FAQs
5 answersWhich commercial panelboards accept the LGB3B125B?
This bolt-on breaker is designed specifically for installation in Siemens P1, P2, and P3 power distribution panelboards.
Do the factory lugs on the LGB3B125B support both copper and aluminum wire?
Yes, the standard terminal lugs are dual-rated. They accept 8 to 1/0 AWG copper (Cu) conductors and 8 to 2/0 AWG aluminum (Al) conductors.
Does the LGB3B125B feature adjustable trip dials for selective coordination?
No. While it provides Long-Time and Instantaneous (LI) protection, both the thermal and magnetic trip points are factory fixed and cannot be adjusted.
Can this breaker be applied in direct current (DC) distribution systems?
Yes, the breaker is rated for use in DC applications up to 125/250VDC, where it provides a maximum interrupting capacity of 14kA.
What Siemens frame family does this breaker belong to?
The LGB3B125B is a molded case circuit breaker from the Sentron family and is built on the Siemens GB/GG frame platform.
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Reviews
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Customers rate this product 5.0 out of 5 based on 1 review.
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Rating
1 review
- RSRon S.Verified BuyerReviewingSiemens LGB3B045B - 45A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/27/26Siemens Breaker
The breaker was exactly what I needed, and it came within a couple days. The price was in line of what it should’ve been. This was my third purchase from Super Breakers. I will definitely use them again in the future.