Cooper Wiring Devices Range Po...
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Cooper Wiring Devices Range Power Receptacle, 3-Pole 4-Wire NEMA 14-50R

Cooper Wiring Devices Range Power Receptacle, 3-Pole 4-Wire NEMA 14-50R

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Model: 1258-SP

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

$8.03
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Cooper Wiring Devices Range Power Receptacle, 3-Pole 4-Wire NEMA 14-50R

The Cooper Wiring Devices Range Power Receptacle is a three-pole, four-wire grounding receptacle engineered for dedicated range and oven circuits. Built from glass-filled nylon for long-term durability, this receptacle carries a 125/250V rating at 50A and is configured to NEMA 14-50R, making it a dependable choice for high-draw kitchen appliance installations. With back wiring and screw connection terminals accepting #12 – 4 AWG conductors, it delivers a secure, code-compliant termination for demanding residential and commercial applications.

Key Features

  • Electrical Rating: 125/250V at 50A for dedicated range and oven power circuits.
  • NEMA Configuration: 14-50R three-pole, four-wire grounding design for compatibility with standard range plugs.
  • Durable Construction: Glass-filled nylon housing resists cracking and wear under sustained electrical and mechanical load.
  • Wiring Method: Back wiring with screw connection terminals accepting #12 – 4 AWG wire sizes for a secure termination.
  • Mounting Type: Flush mount design for clean installation in standard wall boxes.
  • Design Type: Three-pole, four-wire receptacle built for power-style range applications.
  • Color: Black finish for a neutral, professional appearance.
  • Compatibility: Designed for use with S21-series wiring devices and accessories.

Technical Specifications

  • Amperage Rating: 50A
  • Used With: S21
  • Receptacle Type: Three-pole, four-wire, grounding
  • Material: Glass-filled nylon
  • Voltage Rating: 125/250V
  • Wiring Method: Back
  • Allowable Wire Size: #12 - 4 AWG
  • Connection Type: Screw
  • Nema Configuration: 14-50R
  • Mounting Type: Flush
  • Color: Black

Typical Applications

  • Dedicated Range and Oven Power Circuits
  • Residential Kitchen Electrical Installations
  • Commercial Kitchen Appliance Wiring
  • Replacement of Worn or Damaged Range Receptacles
  • New Construction and Renovation Wiring for Major Appliances

Why Cooper Wiring Devices?

Cooper Wiring Devices builds this range power receptacle from glass-filled nylon with secure screw-terminal back wiring, giving installers a rugged, reliable connection point for demanding 50A, 125/250V range circuits. The three-pole, four-wire grounding configuration and NEMA 14-50R design support consistent, code-compliant performance for both residential and commercial kitchen installations.

Manufacturer Resources

Product Specs

Receptacle Type:
Three-pole, four-wire, grounding
Voltage Rating:
125/250V
Number Of Poles:
Three-pole
Wiring Method:
Back
Allowable Wire Size:
#12 - 4 AWG
Connection Type:
Screw
Nema Configuration:
14-50R
Special Features:
Range
Installation Category:
Flush
Amperage Rating:
50A
Used With:
S21
Product Style:
Power
Number Of Wires:
Four-wire
Design Type:
Receptacle
Product Type:
Receptacle
Product Material:
Glass-Filled Nylon
Product Color:
Black
Department:
Electrical
Product Group:
Wiring Devices
Product Subgroup:
Receptacles & Outlets
Product Width:
5 in
Product Length:
2.5 in
Product Height:
8 in
Product Weight:
0.3 lb

Cooper Wiring Devices 1258-SP – Frequently Asked Questions

1) Will a Cooper 1258-SP NEMA 14-50R receptacle work for my electric range with a 4-prong cord?
Yes. The Cooper 1258-SP is configured 14-50R, three-pole four-wire grounding, so it accepts the standard 4-prong range cord (two hots, neutral, ground) at 125/250V, 50A. If the range cord on your appliance is the older 3-prong type, it will not mate with this device and the cord needs to be changed to a 4-wire.
2) What wire size can I land on the Cooper 1258-SP range receptacle terminals?
Terminals take #12 through 4 AWG on screw connections, wired from the back. That range covers the 6 AWG copper commonly pulled for a 50A range circuit as well as heavier 4 AWG aluminum feeds, so you are not fighting the terminal on a full 50A run.
3) Can I use this Cooper 50A receptacle on a standard 20A kitchen counter circuit?
No. This is a dedicated 50A, 125/250V two-hot device for a range or oven home run, not a general-purpose 125V outlet. For 20A/125V counter and general receptacles, look at a spec grade duplex such as the Leviton CR20-GY commercial grade 20A 5-20R, the Bryant 5362B heavy-duty 20A/125V duplex, or a GFCI like the Leviton SmartlockPro G5362-WTE where code calls for protection.
4) What 50A receptacle should I use if the circuit is a locking twist-lock connection instead of a straight-blade range plug?
The Cooper 1258-SP is a straight-blade NEMA 14-50R rated 50A at 125/250V, so it will only accept a matching 14-50P range cord cap. If the equipment terminates in a twist-lock cap, the Eaton 7379 industrial locking receptacle is also a 50A device and is rated 600V/250V AC/DC in black. Confirm the cord cap configuration on the appliance or machine before choosing between the two, because a locking body and a straight-blade body will not mate.
5) Can I use a 20A duplex receptacle on a range circuit instead of the Cooper 1258-SP?
No. The Cooper 1258-SP is a three-pole, four-wire grounding device rated 50A at 125/250V with a 14-50R face, which is what a range or oven cord requires. General-purpose duplex devices such as the Bryant 5362B heavy-duty 20A/125V duplex or the Pass and Seymour 26352W 20A 125V spec grade decorator duplex are single-voltage 125V devices and cannot serve a 240V range load. Use those on standard kitchen branch circuits and keep the 14-50R on the dedicated appliance circuit.
6) Can I use this 14-50R receptacle to charge an EV?
The 1258-SP is a 50A, 125/250V 14-50R device, which is the same configuration most Level 2 EV cordsets plug into. Note it is built and specified as a range receptacle with back-wired screw terminals and a glass-filled nylon body, mounted flush in the box. EV charging is a continuous load, so the circuit design and any local code requirements for that use are on the installer.
7) Is this a flush-mount or surface-mount range outlet?
Flush mount. The Cooper range receptacle drops into a standard wall box so the face sits in the wall plate, which is what you want on a finished kitchen wall. If the range circuit is surface-run in conduit or the box is a surface box, you need a surface-mount 14-50R instead.
8) I need a 50A locking receptacle, not a straight-blade range outlet. Is this the right part?
No. The 1258-SP is a straight-blade 14-50R range device, the blades pull straight out. For a 50A locking connection, Eaton's industrial locking receptacle rated 50A, 600V/250V AC/DC in black is the twist-lock option. Pass & Seymour's L2130R is a 30A locking single if your load is smaller.
9) I need a 30A single receptacle, not 50A. What is the closest alternative?
The Cooper 1258-SP is built for 50A range circuits and accepts #12 to 4 AWG conductors. For a 30A single-outlet device, the Pass and Seymour L2130R is a 30A single receptacle in the L2130 configuration, finished in black. It is a locking configuration rather than the Cooper's straight-blade 14-50R, so verify the plug on the equipment matches before ordering.
10) Does the Cooper 1258-SP offer GFCI or AFCI protection for a kitchen circuit?
The Cooper 1258-SP is a straight power-style 14-50R receptacle in glass-filled nylon with screw terminals; protection for that circuit is handled upstream at the breaker. If you need protection built into the device itself on a 125V circuit, the Leviton G5362-WTE is a SmartlockPro GFCI duplex rated 20A 125V and weather and tamper-resistant, and the Leviton AFTR2-HG is an AFCI duplex rated 20A 125V, hospital grade and tamper-resistant. Those are 125V duplex devices and are not substitutes for the range outlet.
11) Is the Cooper 1258-SP suitable for a hazardous or wash-down industrial area?
The Cooper 1258-SP is a flush-mount glass-filled nylon device intended for standard wall boxes on dedicated range and oven circuits. For classified areas, Appleton builds sealed and interlocked alternatives: the U-Line ECS factory-sealed 15 and 20 amp plug and receptacle set is a three-pole device, and the FSQC series is an interlocked explosionproof receptacle. Those carry different amperage and enclosure designs than the 50A 14-50R and are selected by area classification, not by appliance cord.
12) For a healthcare kitchen or patient-care area, does the Cooper 1258-SP come in a hospital grade version?
The Cooper 1258-SP is a black, three-pole four-wire 14-50R range receptacle in glass-filled nylon. Hospital-grade devices in the 125V duplex range include the Leviton 16262-IGG Decora Plus hospital-grade isolated-ground duplex at 15A/125V in gray and the Pass and Seymour 2097HGI hospital grade 20A self-test GFCI duplex in ivory. Those serve general-purpose receptacle circuits; the 50A range outlet remains a separate dedicated device.
13) Can the Cooper 1258-SP be used for a 277V motor load?
No. The Cooper 1258-SP is rated 125/250V and configured 14-50R for range and oven cords. For a 277V motor-duty connection, the Bryant 430R9W is a 2-pole 3-wire 277V motor-duty receptacle in the 4750DR series. The pole and wire count differs from the Cooper's three-pole four-wire grounding arrangement, so the two are not interchangeable on the same circuit.
14) What is the Cooper range receptacle housing made of, and does it hold up in a commercial kitchen?
The body is glass-filled nylon, which is the material used on high-draw devices because it resists cracking from the mechanical strain of pulling a heavy range cord and the heat of a sustained 50A load. It is the same device used in both residential and commercial kitchen range circuits.
15) Does the Cooper 1258-SP come with a wall plate?
The 1258-SP is the receptacle itself, a three-pole four-wire flush device. It is specified for use with S21 series wiring devices and accessories, which is where the matching plate and related parts come from.
16) What is the difference between the Cooper 1258-SP and a flanged locking receptacle like the Bryant 70520FR?
The Cooper 1258-SP is a flush-mount device that drops into a standard wall box and wires from the back with screw terminals sized for #12 to 4 AWG. The Bryant 70520FR is a 7 Series NEMA flanged locking receptacle, a flanged inlet-style body intended for surface or equipment-face mounting with a twist-lock face. Choose by how the device mounts and by the mating cord cap.
17) What color is the Cooper 1258-SP and does it come in anything else?
Black only, in the single model 1258-SP. Range receptacles are typically specified in black and normally sit behind the appliance, so finish match with the rest of the kitchen devices is rarely a factor.
How fast can I get the Cooper Wiring Devices 1258-SP 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 1258-SP come with a warranty?
Absolutely. The Cooper Wiring Devices 1258-SP 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 1258-SP?
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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