Leviton 3-Wire 2-Pole Polarized Industrial Grade Straight Blade Plug, 250-Volt 1-Phase
The Leviton 3-Wire 2-Pole Polarized Industrial Grade Straight Blade Plug is engineered for demanding commercial and industrial power connections where dependable performance is non-negotiable. Configured as a 3-wire, 2-pole polarized straight blade plug, it is rated 250-Volt, 1-Phase, making it well suited for a wide range of single-phase equipment, tools, and machinery connections. Built to Industrial Grade standards, this Leviton plug delivers the rugged, repeat-use durability that maintenance electricians and facility teams rely on for consistent, code-compliant power connections in busy work environments.
Key Features
- 3-Wire, 2-Pole Configuration: Provides a polarized connection with a dedicated grounding conductor for safer, more reliable power delivery.
- Polarized Design: Ensures the plug mates correctly with its intended receptacle every time, reducing wiring errors in the field.
- Industrial Grade Construction: Built for demanding, high-frequency use in commercial and industrial settings where standard-duty devices fall short.
- Straight Blade Plug Style: Straightforward, widely compatible blade configuration for quick, secure connection and disconnection.
- 250-Volt Rating: Matched to 250-Volt circuits for compatibility with a broad range of single-phase equipment and tools.
- 1-Phase Rated: Purpose-built for single-phase power systems common in commercial, industrial, and light industrial facilities.
- Leviton Reliability: Backed by Leviton's reputation for consistent manufacturing quality in wiring devices used across the electrical trade.
Technical Specifications
- Configuration: 3-Wire, 2-Pole
- Plug Style: Straight Blade, Polarized
- Grade: Industrial Grade
- Voltage Rating: 250-Volt
- Phase: 1-Phase
- List Batch: LEV-20260730
Typical Applications
- Commercial and Industrial Power Connections
- Single-Phase Equipment and Tool Cord Sets
- Facility Maintenance and MRO Electrical Work
- Light Industrial Machinery Power Cords
- Renovation and New Construction Electrical Projects
Why Leviton?
Leviton is a long-standing name in wiring devices, and this Industrial Grade Straight Blade Plug reflects that standard with its 3-wire, 2-pole polarized configuration built for 250-Volt, 1-Phase applications. Electrical contractors and facility teams specify Leviton devices for consistent fit, dependable connections, and construction suited to the rigors of professional and industrial use. Choosing Leviton means choosing a wiring device built for repeatable, code-compliant performance on the job.
Manufacturer Resources
Technical Information
Product Specs
- Product Type:
- Straight Blade Plug
- Connection Type:
- Straight Blade
- Amperage Rating:
- 15A
- Voltage Rating:
- 250V
- Poles:
- 2
- Nema Rating:
- 6-15P
- Grade:
- Industrial
- Product Color:
- Black
- Department:
- Electrical
- Product Group:
- Wiring Devices
- Product Subgroup:
- Plugs & Connectors
Leviton 5666-C – Frequently Asked Questions
1) What NEMA configuration is the Leviton 5666-C plug, and what receptacle does it mate with?
The Leviton 5666-C is a NEMA 6-15P plug, rated 15A at 250V. It mates with a 6-15R receptacle, and it will also enter a 6-20R since 6-20 receptacles accept both 6-15P and 6-20P blades. It will not fit a 5-15R (125V) outlet, the blades are oriented differently.
2) Is the Leviton 5666-C a grounding plug, or just two hot blades?
It is a grounding plug. The 5666-C is 2-pole, 3-wire: two hot blades plus a grounding conductor. On a 250V single phase circuit that means both ungrounded legs plus equipment ground, with no neutral.
3) Can I use a 15A 250V plug on a tool with a 20A nameplate?
No. The 5666-C is rated 15 amps, so it should only terminate cord sets feeding loads of 15A or less at 250V. A 20A, 250V load needs a 6-20P plug instead.
4) Does the Leviton 5666-C meet a hospital grade requirement, or do I need a different plug?
The Leviton 5666-C is built to industrial grade, not hospital grade, so it will not satisfy a spec calling for a green-dot hospital grade device. For hospital grade cord plugs, the Bryant 8266T is a hospital grade plug in NEMA 5-15P, the Bryant 8395T is an angled hospital-grade plug in the NEMA 5-20P configuration, and the Bryant 8666TSP is a watertight hospital-grade plug in N6-15P. The 8666TSP is the one that keeps the same 6-15 configuration as the Leviton.
5) What is the closest NEMA 6-15P alternative to the Leviton 5666-C plug?
The Leviton 5666-C is an industrial grade straight blade plug in the NEMA 6-15P configuration, rated 15A 250V. The nearest match on configuration is the Bryant 8666TSP, a watertight hospital-grade plug also in the N6-15P configuration. Both mate the same 6-15 receptacle, so either will land on a 250-volt single-phase cord set; the Bryant is built to hospital grade with a watertight body, while the Leviton is an industrial grade device in black.
6) What is the difference between this 250V plug and a 125V industrial straight blade plug?
Voltage and blade orientation. The Leviton 5666-C is a 250V, 2-pole, 3-wire device (6-15P) for single phase 240V equipment. A 125V industrial plug such as the Eaton Arrow Hart Ultra Grip 15A 125V straight blade plug is the hot-neutral-ground version for standard 120V cord sets. The two are not interchangeable and the blades will not cross-fit.
7) Is this the right plug for a 50A range or welder cord?
No. At 15A, 250V the 5666-C is far too small for a 50A circuit. For a 50A cord end you need a 50A device such as the Bryant 7516NC rubber plug in the NM10-50P series.
8) The cord comes off the equipment at a tight angle - is there an angled version of the Leviton 5666-C?
The Leviton 5666-C is a straight blade plug with a straight body in NEMA 6-15P. Where the cord has to exit at an angle to clear a wall or machine base, the Pass & Seymour PS5366-SSAN from the EHU series is an angled straight blade plug rated 20A 125V, and the Bryant 8395T is an angle hospital-grade plug in NEMA 5-20P. Both are 125-volt configurations, so confirm your equipment voltage before swapping away from the 250-volt 6-15.
9) Can I use the Bryant 7516NC in place of the Leviton 5666-C plug?
No. The Bryant 7516NC is a rubber electrical plug in the NM10-50P series, a 50-amp non-grounding configuration for much heavier equipment feeds. The Leviton 5666-C is a 15A 250V NEMA 6-15P plug with a 2-pole 3-wire grounding configuration. The blade patterns do not interchange, and the two are sized for entirely different circuits.
10) What color is the Leviton 5666-C plug body?
Black. If you color-code cord sets by voltage across a facility, note this one has no high-visibility option; a yellow body like the Pass & Seymour MaxGrip M3 nylon cord plug is the kind of device shops use when they want the cord end to stand out, though that one is a different configuration.
11) What is the difference between the Leviton 5666-C and the Pass & Seymour MaxGrip M3 cord plug?
The Leviton 5666-C is a black industrial grade straight blade plug, 2-pole 3-wire, 15A 250V in NEMA 6-15P. The Pass & Seymour PS5965Y is a MaxGrip M3 nylon cord plug supplied in yellow. The nylon body and high-visibility yellow color suit cord sets that get dragged and need to be spotted on a floor; the Leviton is the black industrial device for fixed equipment and tool cords on 250-volt single-phase circuits.
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Does the Leviton 5666-C come with a warranty?
Absolutely. The Leviton 5666-C is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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