Product Description
Leviton MS303-DSW Powerswitch Manual Motor Controller is a 30A, 600VAC, 3-pole, three-phase single-throw industrial toggle switch in white. Suitable as a motor disconnect, it provides reliable ON/OFF control for conveyors, pumps, HVAC equipment, air compressors, and other motor loads, with back & side wiring for fast installation.
MS303-DSW 30A 600V 3-Pole Manual Motor Controller – White
Function: Manual motor controller; Suitable as motor disconnect
Poles/Phase: 3-pole, 3-phase, single throw (AC)
Rating: 30A, 600VAC
HP @ AC: 3HP-120V, 7.5HP-240V, 15HP-480V, 20HP-600V
Grounding: Non-grounding
Color: White (also available in Black)
Short-Circuit Rating: 10kA RMS sym. @ 600V when protected by 30A time-delay fuse
Operating Temp: -40 °C to 60 °C
Warranty: 10-year limited
Country of Origin: Mexico
Shipping: Free shipping on orders over $250
Benefits
- Motor disconnect in a toggle form factor—meets “suitable as motor disconnect” for clear local isolation.
- Industrial durability with silver-alloy contacts, nickel-plated brass strap, and thermoplastic polyester body/cover.
- High performance ratings: up to 20 HP at 600V and 10kA SCCR (with proper fuse).
- Fast, flexible wiring via back & side terminals and clear L1/L2/L3 and T1/T2/T3 markings.
Key Features
- 30A, 600VAC, 3-pole manual motor controller; single-throw operation.
- Back & side wire terminations; #10–#8 AWG copper conductors.
- Endurance: 6,000 cycles on inductive motor load; Overload test: 50 cycles at 6× rated current.
- Dielectric strength withstands 2,200VAC for 1 minute; temperature rise ≤ 50 °C at full load.
- Environmental: UL94 V-0 flammability; -40 °C to 60 °C operating range.
- Compliance: UL 60947-4-1 (supersedes UL 508), cUL (CSA C22.2 No. 111), ANSI C-73, NEMA WD-1/WD-6, NOM-ANCE.
Specifications
Technical Specs
| Function | Manual motor controller, suitable as motor disconnect |
| Poles / Action | 3-pole, three-phase, single-throw (toggle) |
| Electrical Rating | 30A, 600VAC |
| HP Ratings | 3HP @120V; 7.5HP @240V; 15HP @480V; 20HP @600V |
| SCCR | 10,000A RMS sym. @ 600V with 30A time-delay fuse |
| Endurance | 6,000 cycles (inductive motor load) |
Physical Specs
| Contacts | Silver-alloy |
| Body/Cover | Thermoplastic polyester |
| Strap | Nickel-plated brass |
| Toggle | Thermoplastic polyester |
| Grounding | Non-grounding |
| Color | White (also available in Black) |
Performance & Environmental
| Dielectric Strength | 2,200VAC for 1 minute |
| Overload Test | 50 cycles at 6× full rated current (UL20) |
| Temperature Rise | ≤ 50 °C at full load |
| Operating Temperature | -40 °C to 60 °C |
| Flammability | UL94 V-0 |
Compliance & Safety
| Standards | UL 60947-4-1; cUL (CSA C22.2 No. 111); ANSI C-73; NEMA WD-1/WD-6; NOM-ANCE |
| Markings | Terminals identified L1/L2/L3 (line) and T1/T2/T3 (load); ratings permanently marked |
| Warranty | 10-year limited |
Application Examples
- Conveyor systems and packaging lines needing local motor isolation.
- Pumping & HVAC equipment including air handlers and compressors.
- Industrial machinery where a rugged, clearly labeled 3-pole controller is required.
- Maintenance & service points for quick lock-out/tag-out (with code-compliant enclosure).
Installation Tips
- Identify line vs. load: land supply on L1/L2/L3 and motor leads on T1/T2/T3 as marked on the device.
- Wire size: use #10–#8 AWG copper conductors; back or side wire per application.
- Torque: tighten terminal screws to 20 in-lb (max) and verify all connections are secure.
- Overcurrent protection: to achieve the listed 10kA SCCR, protect the circuit with a 30A time-delay fuse.
- Environment: install in an appropriate enclosure and follow all local and national electrical codes.
FAQ
Q: Is MS303-DSW a standard light switch?
A: No. It is an industrial manual motor controller (3-pole) and is rated as suitable for use as a motor disconnect.
Q: What horsepower can it control?
A: 3HP at 120V, 7.5HP at 240V, 15HP at 480V, and 20HP at 600V AC.
Q: What short-circuit current rating (SCCR) applies?
A: 10,000A RMS symmetrical at 600V AC when protected by a 30A time-delay fuse.
Q: What wire sizes and terminations are supported?
A: Back or side wire with #10–#8 AWG copper conductors; terminal screws are 10-32 triple-combination heads.
Q: Can it be used for three-phase motors?
A: Yes. It is a 3-pole, three-phase device with clearly marked line (L1–L3) and load (T1–T3) terminals.
Q: What are the environmental ratings?
A: UL94 V-0 flammability and an operating range of -40 °C to 60 °C.
Q: What approvals does it carry?
A: UL 60947-4-1, cUL (CSA C22.2 No. 111), ANSI C-73, NEMA WD-1/WD-6, and NOM-ANCE.
