Eaton / Westinghouse MA3700S Molded Case Circuit Breaker
- 700A
- 3 Pole
- Bolt-On
Quantity
Eaton / Westinghouse MA3700S - 700A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
A drop-in replacement for aging electrical systems, the Eaton MA3700S is a 3-pole, 700A molded case circuit breaker. It is engineered for commercial and industrial applications requiring robust thermal-magnetic protection. This bolt-on breaker mounts into legacy Westinghouse PRL4 panelboards, switchboards, and motor control centers. It serves as an exact cross-reference for the discontinued MA3700 and HMA3700.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | MA3700S-R |
| Series | MA |
| Amperage | 700A |
| 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 PRL4 Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | (2) 500-750 kcmil (Al/Cu) or (3) 3/0 AWG - 400 kcmil (Al/Cu) |
| Max Wire | 750 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 answersWhich panelboards are compatible with the MA3700S circuit breaker?
This breaker is designed to bolt into legacy Westinghouse PRL4 panelboards, switchboards, and motor control centers.
Can the MA3700S replace an older MA3700 breaker?
Yes, the MA3700S serves as an exact drop-in replacement for the discontinued MA3700 and HMA3700 circuit breakers.
What does the S in the MA3700S catalog number indicate?
The S indicates that the breaker is equipped with a Saf-T-Vue window, allowing operators to visually verify the status of the internal contacts for added safety.
What wire sizes are accepted by the load side lugs on this breaker?
The included lugs accept either two 500 to 750 kcmil or three 3/0 AWG to 400 kcmil aluminum or copper conductors.
Is the trip unit on the MA3700S adjustable?
Yes, this thermal magnetic breaker features an interchangeable trip unit with a fixed thermal element and an adjustable magnetic instantaneous trip setting.
What frame size is the MA3700S?
It is built on the legacy Westinghouse M Frame platform.
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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.