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Eaton / Westinghouse MA3800S Molded Case Circuit Breaker
- 800A
- 3 Pole
- Bolt-On
Eaton / Westinghouse
MA3800S
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
MA3800S
Quantity
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Eaton / Westinghouse MA3800S - 800A 3 Pole Molded Case Circuit Breaker
Re-Certified
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Description
Designed to support aging infrastructure, this 800A, 3-pole molded case circuit breaker delivers robust thermal-magnetic protection. It is an essential component for commercial and industrial facilities utilizing older equipment. The bolt-on MCCB integrates seamlessly into classic Westinghouse panelboards, motor control centers, and Eaton Series C panels. Using this direct replacement helps avoid costly system overhauls. It features a 42kAIC rating at 240VAC and a Saf-T-Vue window.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | MA3800S-R |
| Series | MA |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 20kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse Panelboards, Switchboards, Motor Control Centers, Eaton Series C Panelboards |
| Wire Gauge | (3) 3/0 AWG - 400 kcmil (Al/Cu) |
| Max Wire | 400 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 | 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
6 answersWhat does the "S" suffix in the MA3800S catalog number indicate?
The "S" indicates that the breaker is equipped with a Saf-T-Vue window, which allows operators to visually verify the status of the internal contacts without opening the enclosure.
How many conductors per phase do the standard lugs on the MA3800S accept?
The standard load side lugs accept three conductors per phase, accommodating 3/0 AWG to 400 kcmil aluminum or copper wire.
Can the MA3800S be installed in modern Eaton enclosures?
While originally designed for legacy Westinghouse panelboards and motor control centers, the MA3800S is also fully compatible with modern Eaton Series C panelboards that are configured to accept M-frame breakers.
Can the thermal and magnetic trip settings be adjusted on the MA3800S?
The MA3800S features a thermal-magnetic trip unit. The thermal element for long-time overload protection is fixed, while the magnetic element for instantaneous short-circuit protection can be adjusted to coordinate with other devices in your system.
Does the MA3800S feature an interchangeable trip unit?
Yes, the MA3800S is designed with an interchangeable thermal-magnetic trip unit. This allows the trip block to be removed and swapped if different protection parameters are required, without needing to replace the entire breaker frame.
Is the MA3800S a direct replacement for the standard MA3800?
Yes, the MA3800S shares the exact same physical dimensions, mounting footprint, and electrical ratings as the standard MA3800. The only difference is the addition of the Saf-T-Vue window for contact visibility.
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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.