Free Shipping Over $99
Eaton / Westinghouse LM3250 Molded Case Circuit Breaker
- 250A
- 3 Pole
- Bolt-On
Eaton / Westinghouse
LM3250
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
LM3250
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Eaton / Westinghouse LM3250-R - 250A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Similar Items
300A 3 Pole Molded Case Circuit Breaker
350A 3 Pole Molded Case Circuit Breaker
400A 3 Pole Molded Case Circuit Breaker
Description
Part of the classic Series C family, the Eaton LM3250 is a 3-pole, 250A molded case circuit breaker designed for commercial applications. This L-Frame unit provides robust thermal-magnetic protection. It installs into legacy Westinghouse panelboards, switchboards, and motor control centers. It serves as an exact fit for older systems and can be substituted with the KD3250. Rated for 18kAIC at 480VAC, this bolt-on breaker features fixed thermal and adjustable magnetic trip settings.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | LM3250-R |
| Series | LM |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | 6 AWG-350 kcmil |
| Max Wire | 350 kcmil |
| Min Wire | 6 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Standard Interrupting Capacity |
Product FAQs
6 answersWhat equipment is the LM3250 breaker designed to fit?
As a classic L-Frame bolt-on breaker, it is engineered specifically for legacy Westinghouse panelboards, switchboards, and motor control centers. It is not intended for standard residential load centers or DIN-rail applications.
What wire sizes are supported by the standard lugs on this breaker?
The factory-installed load side lugs accept conductors ranging from 6 AWG to 350 kcmil. Ensure proper torque is applied during installation to prevent terminal overheating.
What does the LI trip function code mean for this breaker?
The LI designation indicates it provides Long-Time (thermal) and Instantaneous (magnetic) protection. The thermal element is fixed for standard overload protection, while the magnetic element is adjustable to fine-tune short-circuit response based on system inrush current.
Is this breaker suitable for both AC and DC systems?
Yes. While commonly used in AC systems up to 600VAC, it is also fully rated for 250VDC applications, making it versatile for industrial DC control panels or specific DC power setups.
What are the primary safety considerations when installing a bolt-on MCCB like the LM3250?
Because it bolts directly to the busbar, the entire panelboard or switchboard must be completely de-energized before installation. Electricians must follow proper lockout/tagout (LOTO) procedures and wear appropriate PPE to mitigate arc flash and shock risks.
How does the Eaton and Cutler-Hammer branding relate to this Westinghouse breaker?
Eaton acquired the Westinghouse distribution and control business. As a result, this Series C L-Frame breaker may be found under the Westinghouse, Cutler-Hammer, or Eaton brand names. The physical dimensions and mounting remain identical for direct replacement.
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.