Cooper Wiring Devices Ultra Gr...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$11.31
Cooper Wiring Devices Ultra Grip Plug, NEMA 6-15P, 15A/250V

Cooper Wiring Devices Ultra Grip Plug, NEMA 6-15P, 15A/250V

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Model: 5666

In Stock (leaves warehouse same day if ordered before 3pm ET)

$11.31
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Cooper Wiring Devices Ultra Grip Plug, NEMA 6-15P, 15A/250V

The Cooper Wiring Devices Ultra Grip Plug is a two-pole, three-wire grounding plug built for dependable field wiring on 15A, 250V branch circuits. Configured to NEMA 6-15P, this plug pairs a durable black nylon housing with brass contacts for solid, low-resistance connections, and its Ultra Grip feature gives installers a secure hold during insertion, removal, and everyday handling. Screw-terminal connections accept #18 - #12 AWG conductors, making it a practical choice for replacement cord ends and new equipment wiring alike.

Key Features

  • NEMA Configuration: 6-15P two-pole, three-wire grounding design matched to 250V equipment plugs.
  • Amperage/Voltage Rating: Rated 15A at 250V for compatible branch-circuit applications.
  • Contact Material: Brass contacts deliver reliable, low-resistance electrical connections.
  • Durable Construction: Black nylon body resists wear and impact for long-term field use.
  • Screw Connection Type: Screw terminals accommodate #18 - #12 AWG wire for secure, code-compliant termination.
  • Ultra Grip Design: Special ultra grip surface improves handling and reduces slip during plug insertion and removal.
  • Two-Pole, Three-Wire Grounding: Supports grounded circuit configurations for safer equipment connections.

Technical Specifications

  • Amperage Rating: 15A
  • list_batch: COOPER-20260730

Typical Applications

  • Residential and Commercial Cord and Plug Wiring
  • Appliance and Equipment Power Connections
  • Replacement Plug Installations
  • Electrical Maintenance and Repair Work
  • 250V Branch Circuit Cord Sets

Why Cooper Wiring Devices?

Cooper Wiring Devices builds this Ultra Grip Plug with brass contacts and a durable nylon housing to hold up under repeated field use. The NEMA 6-15P configuration and 15A/250V rating give installers a straightforward, code-appropriate option for grounded plug replacements, while the Ultra Grip feature adds a practical handling benefit that sets it apart from standard plug designs. It is a dependable choice for professionals who need consistent electrical performance job after job.

Manufacturer Resources

Product Specs

Contact Material:
Brass
Receptacle Type:
Two-pole, three-wire, grounding
Voltage Rating:
250V
Number Of Poles:
Two-pole
Allowable Wire Size:
#18 - #12 AWG
Connection Type:
Screw
Nema Configuration:
6-15P
Special Features:
Ultra grip
Amperage Rating:
15A
Number Of Wires:
Three-wire
Design Type:
Plug
Product Type:
Straight Blade Plug
Product Material:
Nylon
Product Color:
Black
Department:
Electrical
Product Group:
Wiring Devices
Product Subgroup:
Plugs & Connectors

Cooper Wiring Devices 5666 – Frequently Asked Questions

1) Will a NEMA 6-15P plug fit my 240V equipment outlet?
The Cooper Ultra Grip plug is wired to the NEMA 6-15P pattern: two flat blades plus a round ground pin, rated 15A at 250V. It mates only with a 6-15R receptacle (or a 6-20R, which accepts both 6-15 and 6-20 blades). It will not go into a 5-15R 125V outlet, and it will not fit a 6-30 or 6-50 configuration. If your nameplate says 240V single phase at 15 amps or less, this is the matching cord end.
2) What size cord wire can I terminate in this Cooper 5666 plug?
Screw terminals take #18 through #12 AWG conductors, so SJ/SJO or SO cord from 18/3 up to 12/3 lands in it. That covers the 14/3 cord you would normally run for a 15A 250V appliance circuit. Three terminals, two hot and one ground, since it is a two-pole three-wire grounding device.
3) Can I put this on a 20 amp 250V cord set?
No. The Cooper 5666 is rated 15A at 250V, and a 6-15P blade pattern will not enter a 6-20R in the orientation a 20A load needs. For a 20A 250V cord end you need a 6-20P device. Feeding a 20A load through a 15A plug is an overload on the device.
4) Which NEMA 6-15P plug should I use in a patient care area instead of the Cooper 5666?
For patient care spaces where hospital grade is required, the Bryant 8666TSP is a watertight hospital-grade plug in the N6-15P configuration, so it carries the same blade pattern as the Cooper 5666 but with a hospital-grade listing. The Cooper 5666 Ultra Grip is a general-purpose 15A/250V plug with a nylon body and brass contacts and is not a hospital-grade device.
5) What is the closest equivalent to the Cooper 5666 Ultra Grip plug from another brand?
The Leviton 5666-C is the closest match. Like the Cooper 5666, it is a two-pole, three-wire straight blade plug rated 250 volts, and Leviton lists it as industrial grade. The Cooper 5666 is configured NEMA 6-15P at 15A/250V with a black nylon body and brass contacts. If you are matching cord ends already in service, confirm the blade configuration on the device you are replacing before swapping brands.
6) Is the Eaton Arrow Hart AH5266 Ultra Grip plug the same thing as the Cooper 5666?
No. Both carry the Ultra Grip design, but the Eaton Arrow Hart AH5266 is a 15A 125V industrial specification grade straight blade plug, while the Cooper 5666 is rated 15A at 250V in the NEMA 6-15P configuration. The 125V and 250V blade patterns are not interchangeable, so the AH5266 will not mate with a 250V receptacle.
7) Will this plug hold up on a shop machine that gets unplugged constantly?
The body is nylon, which takes impact and abrasion better than thermoplastic on a concrete floor, and the current-carrying contacts are brass for a low-resistance connection under repeated cycling. For a wet or washdown location you want a watertight body instead, such as the Bryant 8666TSP in the same N6-15P configuration.
8) I need an angled plug rather than a straight one for a tight equipment connection. What are the options?
The Cooper 5666 is a straight blade plug, so for a tight cord exit you would look at an angle body instead. The Pass and Seymour PS5366-SSAN is an EHU series angled straight blade plug rated 20A 125V, and the Leviton 275-E is a commercial grade four-wire three-pole angle plug. Both differ from the Cooper 5666, which is a two-pole, three-wire 250V device, so verify the configuration your equipment requires.
9) We buy tamper-resistant plugs for a facility standard. Does the Cooper 5666 cover that, or do I need a different part?
The Cooper 5666 Ultra Grip is a standard NEMA 6-15P plug with screw terminals accepting #18 to #12 AWG; tamper resistance is not part of its feature set. For a tamper-resistant hospital-grade standard, Leviton offers the 8215-CAT in NEMA 5-15P and the 8315-CT in NEMA 5-20P, both sold in packs of 100. Note those are 125V configurations and will not replace a 250V 6-15P cord end.
10) Will the Cooper 5666 work on a 50 amp range or welder cord?
No. The Cooper 5666 is rated 15A at 250V in the NEMA 6-15P configuration, with screw terminals sized for #18 to #12 AWG conductors, so it is not suited to heavy 50 amp cords. For that duty, the Bryant 7516NC is a rubber-bodied plug in the NM10-50P series. Confirm the receptacle configuration at the outlet before ordering.
11) What is the difference between the Cooper 5666 and the Bryant 8266T or 8395T plugs?
The Bryant 8266T is a hospital-grade plug in NEMA 5-15P and the Bryant 8395T is an angle hospital-grade plug in NEMA 5-20P, both 125V configurations. The Cooper 5666 is a two-pole, three-wire grounding plug configured NEMA 6-15P for 15A/250V service. None of the three cross-mate, so the deciding factor is the receptacle on the circuit and whether your facility requires a hospital-grade device.
12) How does the Cooper 5666 Ultra Grip compare to the Pass and Seymour MaxGrip M3 cord plug?
Both use a nylon body and a grip-oriented design: the Cooper 5666 has the Ultra Grip surface for handling during insertion and removal, and the Pass and Seymour PS5965-Y is a MaxGrip M3 nylon cord plug in yellow. The visible difference for a maintenance crew is color coding, since the Cooper 5666 is black. Match the blade configuration to the circuit; the Cooper is NEMA 6-15P at 15A/250V.
How fast can I get the Cooper Wiring Devices 5666 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. 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 Cooper Wiring Devices 5666 come with a warranty?
Absolutely. The Cooper Wiring Devices 5666 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Cooper Wiring Devices 5666?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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