Eaton / Cutler-Hammer MA3500 Molded Case Circuit Breaker
- 500A
- 3 Pole
- Unit Mount
Quantity
Eaton / Cutler-Hammer MA3500 - 500A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Part of the legacy M-Frame series, this 500-amp molded case circuit breaker delivers reliable long-time and instantaneous (LI) protection for heavy industrial loads. It installs into Eaton Pow-R-Line 4 panelboards and switchboards, utilizing standard unit mounting. While this specific MA-type frame has been succeeded by the MDL3500, it remains a crucial component for maintaining existing infrastructure. The unit features adjustable magnetic trip settings and carries a 30kAIC rating at 480VAC.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | MA3500-R |
| Series | MA |
| Amperage | 500A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 20kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Eaton Pow-R-Line 4 Panelboards, Switchboards |
| Wire Gauge | (2) 3/0 AWG - 500 kcmil |
| Max Wire | 500 kcmil |
| Min Wire | 3/0 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 Included |
| Standards | CSA C22.2 No. 5.1, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Interchangeable Trip Unit |
Product FAQs
6 answersIs the Eaton MA3500 a direct replacement for the Westinghouse MA3500?
Yes. Eaton acquired the Westinghouse distribution equipment division. The Eaton and Cutler-Hammer MA3500 breakers are direct, drop-in replacements for the legacy Westinghouse MA3500.
What panelboards are compatible with the MA3500 circuit breaker?
This M-frame breaker is designed for installation in Eaton Pow-R-Line 4 panelboards and compatible legacy Westinghouse switchboards.
What wire sizes are supported by the load side lugs on this breaker?
The standard load side lugs accept two 3/0 AWG to 500 kcmil conductors per phase.
What does the LI trip function indicate on the MA3500?
The LI designation means the breaker is equipped with a thermal-magnetic trip unit providing Long-Time (L) and Instantaneous (I) protection. The thermal element provides fixed overload protection, while the magnetic element allows for adjustable short-circuit response.
Can the trip unit in the MA3500 be replaced in the field?
Yes. This breaker features an interchangeable trip unit design, allowing electricians to swap the thermal-magnetic trip unit without replacing the entire M-frame housing.
How does the MA3500 mount inside an enclosure?
It is a unit-mount, bolt-on circuit breaker. The line side bolts directly to the busbars in compatible panelboards or switchboards.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 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.