Leviton 3-Pole 600V AC 30A Industrial Grade 3-Phase Manual Motor Controller
The Leviton 3-Pole 600V AC 30A Industrial Grade 3-Phase Manual Motor Controller is engineered for dependable manual disconnect and motor control in demanding commercial and industrial electrical systems. Built to an industrial-grade standard, this 3-pole controller is rated for 600-Volt AC service at 30 Amps, making it suitable for controlling 3-phase motor loads in facilities where durability, safety, and precise manual switching are essential. Electricians, panel builders, and facility maintenance teams rely on Leviton manual motor controllers for consistent, code-compliant performance in demanding operating environments, from manufacturing floors to mechanical rooms. The 3-pole design ensures all three legs of a 3-phase circuit are switched together, reducing the risk of single-phasing a connected motor during manual operation.
Key Features
- 3-Pole Configuration: Designed for 3-phase circuits, allowing simultaneous manual switching of all three motor leads for balanced, reliable disconnect.
- 600-Volt AC Rating: Rated for use on 600-Volt AC systems, supporting heavy-duty industrial power distribution and motor control applications.
- 30-Amp Current Rating: Handles up to 30 Amps of continuous current, suitable for motor loads commonly found in industrial and commercial equipment.
- Industrial Grade Construction: Built to industrial-grade standards for long-term reliability and durability in demanding plant, warehouse, and mechanical environments.
- 3-Phase Motor Control: Purpose-built for manual on/off control of 3-phase motor circuits, keeping all phases switched in unison.
- Manual Operation: Provides a straightforward, dependable manual disconnect means for motor circuits, supporting lockout/tagout safety practices during equipment maintenance and servicing.
- Leviton Build Quality: Manufactured by Leviton, a recognized name in industrial and commercial electrical devices, for consistent long-term performance.
Technical Specifications
- Refer to manufacturer documentation for complete technical specifications.
Typical Applications
- Industrial and Commercial Motor Control
- 3-Phase Pump and Fan Motor Circuits
- Manufacturing and Processing Equipment
- HVAC Equipment Disconnect Switching
- Panelboard and Motor Control Center Wiring
- Renovation and New Construction Electrical Projects
Why Leviton?
Leviton builds its manual motor controllers to an industrial-grade standard, giving electrical professionals a dependable manual disconnect solution for 3-phase motor circuits. With a 600-Volt AC, 30-Amp rating, this 3-pole controller is suited for the rigorous demands of industrial and commercial electrical work. Contractors and facility teams choose Leviton for consistent, code-compliant performance backed by the company's long-standing reputation for durable, professional-grade electrical products used across industrial, commercial, and institutional projects.
Manufacturer Resources
Technical Information
Product Specs
- Product Type:
- Manual Motor Controller
- Poles:
- 3
- Amperage Rating:
- 30A
- Voltage Rating:
- 600V
- Grade:
- Industrial
- Product Color:
- White
- Department:
- Electrical
- Product Group:
- Wiring Devices
- Product Subgroup:
- Electrical Controls
Leviton MS303-DSW – Frequently Asked Questions
1) Will a Leviton MS303-DSW manual motor controller work on a 480V 3-phase motor circuit?
Yes. The MS303-DSW is rated 600V AC, so it covers the common 3-phase system voltages up to and including 480V, at up to 30 amps. All three poles switch together, so you are not leaving a leg live or single-phasing the motor when you open it.
2) Can I use this Leviton manual motor controller as the lockable disconnect at the equipment?
It is built as a manual disconnect means for motor circuits and supports lockout/tagout practice during servicing, which is how most electricians use it at a pump, fan, or HVAC unit. Rated 600V AC, 30A, 3-pole.
3) Is a 30A manual motor controller big enough for my 3-phase motor?
The MS303-DSW handles up to 30 amps continuous across all three legs. Size it against the motor's full-load amps from the nameplate, not horsepower alone; if FLA plus your required margin exceeds 30A, you need a larger-ampacity switch instead.
4) What is the difference between a manual motor controller like this and a magnetic motor starter?
A manual motor controller is operated by hand at the device. You throw it to start or stop the motor and to isolate it for service. A magnetic starter is coil-operated and can be triggered remotely by a pushbutton station, thermostat, or control circuit. If your motor needs remote start/stop, low-voltage control, or automatic restart logic, this 3-pole manual unit is not the right device.
5) Does the Leviton MS303-DSW include motor overload protection?
Treat it as a switching and disconnect device for 3-phase motor circuits, not as overload protection. Plan on separate overload and short-circuit protection for the motor branch circuit as your design requires.
6) Can I use a 3-pole Leviton MS303 on a single-phase 240V motor?
It is built for 3-phase circuits, switching all three motor leads in unison. You can apply a 3-pole device on single-phase by using two of the poles, but if you only ever need two legs switched, a 2-pole manual controller is the cleaner and usually smaller fit.
7) What part number do I order for the Leviton 30A 3-pole manual motor controller?
Order Leviton MS303-DSW. That is the 3-pole, 600V AC, 30A industrial grade manual motor controller in white, and it is the single configuration for this model.
8) Is this Leviton controller industrial grade or just commercial spec?
It carries Leviton's industrial grade designation, which is the heavier-duty tier intended for plant floors, warehouses, and mechanical rooms rather than light commercial use. Device color is white.
9) Where can I get the full technical data on the Leviton MS303-DSW before I spec it?
Leviton publishes a technical information sheet covering this manual motor controller line, available as a PDF alongside the product record. Use it to confirm enclosure and wiring details against your panel or equipment layout.
How fast can I get the Leviton MS303-DSW delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
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Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Leviton MS303-DSW come with a warranty?
Absolutely. The Leviton MS303-DSW is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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