Free Shipping Over $99
Free Shipping Over $99
Free Shipping Over $99
Free Shipping Over $99
Siemens LGB3B090B Molded Case Circuit Breaker
- 90A
- 3 Pole
- Bolt-On
Siemens
LGB3B090B
Molded Case Circuit Breaker
Brand
Siemens
SKU
LGB3B090B
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Siemens LGB3B090B - 90A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Siemens LGB3B090B - 90A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | LGB3B090B |
| Series | LGB |
| Amperage | 90A |
| 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, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Low Tab, Reverse Feed, Trip-Free Mechanism, Non-Interchangeable Trip |
Sold out
Quantity
Siemens LGB3B090B - 90A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | LGB3B090B |
| Series | LGB |
| Amperage | 90A |
| 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, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Low Tab, Reverse Feed, Trip-Free Mechanism, Non-Interchangeable Trip |
Similar Items
80A 3 Pole Molded Case Circuit Breaker
110A 3 Pole Molded Case Circuit Breaker
70A 3 Pole Molded Case Circuit Breaker
Description
Providing reliable commercial power distribution, the Siemens LGB3B090B is a 90A, 3-pole molded case circuit breaker. It features a fixed thermal-magnetic trip unit for long-time and instantaneous (LI) protection. The breaker mounts into Siemens P1, P2, and P3 panelboards using a sturdy bolt-on connection. For maintenance planning, this unit is replaced by the newer 3VA5190-6ED31-0AA0 model. It boasts a 65kAIC interrupting rating at 480Y/277VAC and is HACR rated for HVAC applications.Specifications
| Brand | Siemens |
|---|---|
| Part Number | LGB3B090B |
| Series | LGB |
| Amperage | 90A |
| 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, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Low Tab, Reverse Feed, Trip-Free Mechanism, Non-Interchangeable Trip |
Product FAQs
6 answersWhich panelboards are compatible with the LGB3B090B circuit breaker?
This breaker is designed for use in Siemens P1, P2, and P3 panelboards. It features a bolt-on connection specifically configured for panelboard bus mounting.
What wire sizes are accepted by the lugs on the LGB3B090B?
The factory-installed lugs accept 8 to 1/0 AWG copper wire or 8 to 2/0 AWG aluminum wire. These lugs are designed for standard load-side connections in commercial panelboards.
What does the LI trip function indicate on this Siemens breaker?
The LI designation means the breaker features a thermal-magnetic trip unit providing Long-Time (L) and Instantaneous (I) overcurrent protection. Both the thermal and magnetic trip points are fixed on this specific model.
Can the LGB3B090B be mounted on a DIN rail?
No. While some Siemens G-frame breakers like the GG series support DIN rail mounting, the GB and LGB frames are configured exclusively for bolt-on panelboard mounting.
Can this 3-pole breaker be used in DC power systems?
Yes, the LGB3B090B is rated for use in DC applications up to 125/250VDC, providing an interrupting capacity of 14kA for those specific systems.
Is there a newer replacement model for the LGB3B090B?
Yes, for maintenance planning and upgrades, Siemens replaces this legacy LGB frame breaker with the newer 3VA series, specifically catalog number 3VA5190-6ED31-0AA0.
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.
Search
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.