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Siemens LGB3B050B Molded Case Circuit Breaker
- 50A
- 3 Pole
- Bolt-On
Siemens
LGB3B050B
Molded Case Circuit Breaker
Brand
Siemens
SKU
LGB3B050B
Quantity
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Siemens LGB3B050B - 50A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Siemens LGB3B050B - 50A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | LGB3B050B |
| Series | LGB |
| Amperage | 50A |
| 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 |
| 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 (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 Side Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CSA, IEC, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Trip-Free Mechanism |
Quantity
Siemens LGB3B050B - 50A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Series | LGB |
| Amperage | 50A |
| 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 |
| 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 (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 Side Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CSA, IEC, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Trip-Free Mechanism |
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Description
Built for commercial and industrial applications, the Siemens LGB3B050B is a 3-pole, 50-amp molded case circuit breaker from the Sentron GB/GG frame family. It provides reliable thermal-magnetic protection with long-time and instantaneous (LI) trip functions. This unit bolts into Siemens P1, P2, and P3 panelboards. For modern upgrades, it is replaced by the 3VA4150-6ED34-0AA0, which requires a specific mounting kit. Rated for 65kAIC at 480Y/277VAC, it features load side lugs and an HACR rating.Specifications
| Brand | Siemens |
|---|---|
| Part Number | LGB3B050B |
| Series | LGB |
| Amperage | 50A |
| 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 |
| 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 (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 Side Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CSA, IEC, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Trip-Free Mechanism |
Product FAQs
7 answersWhich panelboard systems are compatible with the LGB3B050B circuit breaker?
This Sentron G-Frame molded case circuit breaker is engineered specifically for bolt-on installation in Siemens P1, P2, and P3 commercial panelboards.
How are the line and load connections configured on this breaker?
As a dedicated panelboard breaker, the line side bolts directly to the internal bus structure. The load side comes equipped with factory-installed lugs to accept the branch circuit wiring.
What are the acceptable conductor sizes for the load terminals?
To ensure a secure connection for a 50-amp circuit, the integrated load lugs accommodate 8 to 1/0 AWG for copper conductors and 8 to 2/0 AWG for aluminum conductors.
Can the trip thresholds on the LGB3B050B be adjusted in the field?
No, this unit uses fixed thermal and fixed magnetic trip mechanisms. Unlike electronic trip breakers, it provides Long-Time and Instantaneous (LI) protection at a static 50-amp rating that cannot be modified.
Is this unit a suitable replacement for older ITE brand breakers?
Yes, Siemens acquired the ITE product line and continues to manufacture this exact G-Frame profile. The Siemens LGB3B050B is a direct drop-in replacement for the obsolete ITE LGB3B050B.
How does the thermal-magnetic trip unit protect the electrical circuit?
The internal bi-metallic thermal element reacts to sustained overloads by heating up and tripping the breaker. Simultaneously, the magnetic element provides instantaneous protection by tripping immediately during high-current short circuits.
Is the LGB3B050B rated for use in direct current systems?
Yes, while primarily used in AC commercial panelboards, this thermal-magnetic breaker is also fully rated for DC applications. It provides a 14kAIC interrupting capacity when installed in 125/250VDC systems.
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