WEG ESWS-B40V24E-RM70 Magnetic Motor Starter | 7.5HP 230V Single Phase | 40A Contactor with 25-40A Adjustable Overload
The WEG ESWS-B40V24E-RM70 is a direct single-phase enclosed magnetic motor starter built for compressor motor control applications that need dependable switching and adjustable overload protection. It is commonly used on 7.5HP, 230V single-phase air compressor motors where a pressure switch controls the starter coil and the starter handles the motor switching duty.
This model combines a 40A contactor (CWB40), 25-40A adjustable overload relay (RW67), E-Reset control, and a TYPE 1 metallic enclosure. WEG lists this enclosed starter as part of its ESWS single-phase series with UL508A approval and cULus certification for enclosed motor control applications.
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Helps Reduce Pressure Switch Contact Wear: In many air compressor systems, the pressure switch sends the control signal while the magnetic starter handles the heavier motor switching load. This arrangement can help reduce pressure switch contact wear while adding dedicated overload protection for the motor.
Common Applications & Use Cases
The ESWS-B40V24E-RM70 is well suited for indoor compressor and motor control applications where enclosed overload protection and dependable switching are required.
- Industrial air compressors: Commonly used on 7.5HP, 230V single-phase compressor motors.
- High-duty workshop compressors: Adds enclosed switching and overload protection for larger single-phase motor loads.
- Auto body and paint shops: Useful for compressors that cycle repeatedly throughout the day.
- Maintenance replacements: A practical option when replacing a failed enclosed single-phase magnetic starter.
- OEM and retrofit projects: Metallic enclosed design works well for general indoor motor control applications.
Technical Specifications – WEG ESWS-B40V24E-RM70
| Feature | Details |
|---|---|
| Catalog Number | ESWS-B40V24E-RM70 |
| WEG Product ID | 14971375 |
| Brand | WEG |
| Type | Direct Single-Phase Enclosed Magnetic Motor Starter |
| Horsepower Rating | 7.5HP @ 230V Single Phase | 3HP @ 115V Single Phase |
| Control Voltage | 180-208V 50Hz / 208-240V 60Hz |
| Rated Current (AC-3) | 40A (CWB40) |
| Overload Relay | 25-40A Adjustable (RW67) |
| Overload Type | Bi-Metallic, Ambient Compensated |
| Trip Class | Class 10 |
| Poles | 2-Pole, Single Phase, Non-Reversing |
| Enclosure | Metallic Crate | TYPE 1 |
| Dimensions (H x W x D) | 13.0" x 7.5" x 5.6" |
| Weight | 10.00 lbs |
| Control Device | E-Reset |
| Rated Operational Voltage | Ue ≤ 600V |
| Starters Complements | Does Not Contain |
| UPC | 7894171770779 |
| Certifications | UL508A Approved | cULus Certified |
| Replaces | ESWS-40V24E-RM35 |
| Documentation | View Official WEG Product Page |
Professional Installation Recommended: This starter should be installed by a qualified electrician. Before installation, verify motor horsepower, full-load amperage, incoming voltage, control circuit voltage, pressure switch compatibility, grounding, and all NEC and local code requirements.
Why Choose WEG ESWS-B40V24E-RM70?
- Built for enclosed compressor motor control: Designed for dependable switching and overload protection in indoor single-phase applications.
- 40A contactor: Supports larger single-phase motor switching requirements.
- 25-40A overload relay: Adjustable protection helps match the starter to the motor full-load amperage range.
- E-Reset control: Manual reset style operation after overload trip conditions.
- TYPE 1 metallic enclosure: General-purpose enclosed design for indoor applications.
- UL508A approved / cULus certified: Suitable for North American enclosed starter requirements.
- Pressure switch integration: Well suited for compressor systems that use a separate pressure switch for control.
- Strong replacement choice: A practical option when replacing a worn or undersized enclosed compressor starter.
How the ESWS-B40V24E-RM70 Works with Your Air Compressor
In a typical compressor control circuit, a separate pressure switch tells the starter when the motor should run. The starter then handles the motor switching function and overload protection.
- The pressure switch senses tank pressure and sends control voltage to the starter when the compressor calls for operation.
- The starter coil energizes the contactor, closing the power contacts and sending line power to the motor.
- The overload relay monitors motor current and trips when sustained overcurrent conditions exceed the selected setting.
- When cut-out pressure is reached, the pressure switch opens the control circuit, the contactor drops out, and the motor stops.
- This setup helps reduce direct switching load on the pressure switch while adding dedicated motor overload protection.
Frequently Asked Questions
Q: What is the catalog number for this starter?
A: The catalog number is ESWS-B40V24E-RM70, and the WEG product number is 14971375.
Q: What type of starter is this?
A: WEG lists this model as a direct single-phase enclosed starter in the ESWS series.
Q: What horsepower is this commonly used for?
A: This model is commonly used on 7.5HP, 230V single-phase air compressor motors and is also rated 3HP at 115V single phase.
Q: What is the control voltage?
A: The control voltage is 180-208V 50Hz / 208-240V 60Hz.
Q: What is the contactor rating?
A: WEG lists the rated current as 40A with a CWB40 contactor.
Q: What is the overload relay range?
A: The overload relay range is 25-40A and uses the RW67 relay.
Q: Does this unit include an ON/OFF switch?
A: WEG lists the control device as E-Reset and the starter complements field as "Does Not Contain," so this unit is not presented as having a built-in ON/OFF switch.
Q: What enclosure type does it use?
A: This model uses a metallic TYPE 1 enclosure for indoor general-purpose applications.
Q: Do you offer free shipping?
A: Yes. This product qualifies for free shipping. See our shipping policy for details.
Technical Disclaimer: Technical information is provided as a courtesy and is for informational purposes only. Specifications should always be confirmed against current manufacturer literature and the motor nameplate before installation. Users must verify overload settings, voltage, phase, conductor sizing, and application compatibility with the OEM or a licensed electrician. Improper installation can result in equipment damage, fire hazard, or personal injury.
Genuine WEG Product
WEG ESWS enclosed starters are designed for industrial flexibility and motor control reliability. The ESWS-B32V24E-RM34 combines enclosed switching, overload protection, and a TYPE1 metallic design for demanding compressor motor applications.
