Eaton / Westinghouse MA3350 Molded Case Circuit Breaker
- 350A
- 3 Pole
- Bolt-On
Eaton / Westinghouse
MA3350
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
MA3350
Quantity
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Eaton / Westinghouse MA3350 - 350A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
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Description
Engineered for commercial and industrial applications, the Eaton MA3350 delivers 350A of reliable power distribution. It serves as an exact drop-in replacement for older Westinghouse and Cutler-Hammer M-Frame installations, restoring power without the need for retrofit adapters. Rated for 42kAIC at 240VAC and 30kAIC at 480VAC, this bolt-on breaker utilizes an interchangeable thermal-magnetic trip unit to provide essential long-time and instantaneous protection for aging electrical systems.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Series | MA |
| Amperage | 350A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | MA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Westinghouse Panelboards, Switchboards, Motor Control Centers, Eaton Series C Panelboards |
| Wire Gauge | (1) 250-500 kcmil (Cu/Al) |
| Max Wire | 500 kcmil |
| Min Wire | 250 kcmil |
| 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 | Lugs |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Interchangeable Trip Unit |
Product FAQs
5 answersWhat equipment is the MA3350 compatible with?
This breaker is designed for use in legacy Westinghouse panelboards, switchboards, and motor control centers, as well as Eaton Series C panelboards.
Is there a difference between the Eaton MA3350 and the Westinghouse MA3350?
No. Eaton acquired the Westinghouse distribution equipment business and continues to support this M-frame breaker under the Eaton and Cutler-Hammer brands using the same MA3350 catalog number.
What wire sizes are accepted by the standard lugs on the MA3350?
The standard lugs accept one 250 to 500 kcmil copper or aluminum wire per phase.
Is the trip unit on the MA3350 adjustable?
The thermal trip element is fixed, but the magnetic trip is adjustable to allow for customization of the instantaneous short circuit protection.
Can the MA3350 be used in DC applications?
Yes, it is rated for use in DC systems up to 250VDC with a maximum interrupting capacity of 10kA.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 1 review.
Total 5 star reviews: 1 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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1 review
- DHDave H.ReviewingSquare D MA36600 - 600A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/6/25Never had a problem
We like the service and the prices. The re-certified are great for projects that we have in house.