Siemens LGB2K050B Molded Case Circuit Breaker
- 50A
- 2 Pole
- Bolt-On
Quantity
Siemens LGB2K050B - 50A 2 Pole Molded Case Circuit Breaker
New
Quantity
Description
Built for demanding commercial applications, the Siemens LGB2K050B is a 50A, 2-pole molded case circuit breaker. It features a thermal-magnetic trip unit that delivers precise LI protection. The device mounts into Siemens P1, P2, and P3 panelboards via a secure bolt-on connection. It comes with load-side lugs and serves as the legacy counterpart to the 3VA5150-6ED21-0AA0 substitute. Offering high interrupting capabilities, this breaker is rated for 100kAIC at 240V and is reverse-feed capable.Specifications
| Brand | Siemens |
|---|---|
| Series | LGB |
| Amperage | 50A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC, 600Y/347VAC, 125/250VDC |
| Phase | 1 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 25kA @ 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, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Low Tab, Non-Interchangeable Trip, Trip-Free Mechanism |
Product FAQs
5 answersWhich Siemens panelboards are compatible with the LGB2K050B circuit breaker?
This bolt-on breaker is designed for use in Siemens P1, P2, and P3 panelboards that accept GB or GG frame breakers.
What are the acceptable wire sizes for the terminals on the LGB2K050B?
The included lugs accept 8 AWG to 1/0 AWG copper wire, or 8 AWG to 2/0 AWG aluminum wire.
Is the LGB2K050B rated for direct current (DC) systems?
Yes, this breaker is rated for DC applications up to 125/250VDC with an interrupting capacity of 14kA.
Does this breaker feature adjustable trip settings?
No, the LGB2K050B features a fixed thermal and fixed magnetic trip unit with standard long time and instantaneous protection.
Can I use the LGB2K050B in a load center that requires plug-on breakers?
No, this is a strictly bolt-on circuit breaker intended for commercial panelboards. It will not fit in standard residential plug-on load centers.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 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.