Cooper Wiring Devices TR-274B ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$15.73
Cooper Wiring Devices TR-274B Commercial Grade Tamper-Resistant Duplex Switch

Cooper Wiring Devices TR-274B Commercial Grade Tamper-Resistant Duplex Switch

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Model: TR274V
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$15.73
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Cooper Wiring Devices TR-274B Commercial Grade Tamper-Resistant Duplex Switch

The Cooper Wiring Devices TR-274B Commercial Grade Combination Switch is engineered for commercial-duty electrical installations, combining a single-pole duplex-style device rated 15A with NEMA 5-15R configuration. This family is available in Brown, Ivory, and White finishes and is offered across voltage ratings of 120 volts, 120/277 volts, and 125 volts to match your circuit requirements. Built with a Thermoplastic/PVC housing and brass contacts, this device features tamper-resistant and auto-ground construction along with a neon pilot for visual indication, making it a dependable choice for commercial applications requiring code-compliant safety features.

Key Features

  • Amperage Rating: 15A rating supports reliable performance in commercial-duty circuits.
  • Voltage Range: Available in 120 volts, 120/277 volts, and 125 volts to suit a range of commercial circuit configurations.
  • Color Options: Offered in Brown, Ivory, and White to match standard commercial device plate finishes.
  • Durable Construction: Thermoplastic/PVC housing with brass contact type for long-term durability and dependable conductivity.
  • Connection Type: Screw connector type with a back and side wiring method, accommodating #14 - #12 AWG wire sizes for flexible installation.
  • NEMA Configuration: 5-15R, single-pole, duplex style device suited for standard commercial applications.
  • Special Features: Tamper resistant and auto-ground construction for enhanced commercial safety and code compliance.
  • Illumination: Neon pilot for visual on/circuit indication.
  • Mounting Type: Flush mounting with maintained closure type for standard box installations.
  • Operating Temperature: Rated for use across a -20-60°C operating temperature range.

Technical Specifications

  • Amperage Rating: 15A
  • Operating Temperature: -20-60°C
  • Special Features: Tamper resistant, auto-ground
  • Product Width: 1.08 inches
  • Product Height: 4.19 inches

Typical Applications

  • Commercial Electrical Installations
  • Office and Retail Wiring Upgrades
  • Duplex Receptacle and Switch Replacement
  • New Construction and Renovation Projects
  • Standard 120V, 120/277V, and 125V Commercial Circuits

Why Cooper Wiring Devices?

Cooper Wiring Devices builds this Commercial Grade Combination Switch with brass contacts and a Thermoplastic/PVC housing to deliver dependable, code-compliant performance in demanding commercial environments. Tamper-resistant and auto-ground features support safer installations, while the neon pilot and flush mounting design make it a practical, reliable choice for electrical contractors and facility maintenance professionals. With Brown, Ivory, and White finish options and multiple voltage ratings available, this family of devices offers the flexibility commercial installers need for consistent, code-compliant results across a wide range of projects.

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Manufacturer Resources

Product Specs

Connector Type:
Screw
Wiring Method:
Back and side
Nema Configuration:
5-15R
Contact Type:
Brass
Style Type:
Duplex
Number Of Poles:
Single-pole
Allowable Wire Size:
#14 - #12 AWG
Operating Temperature:
-20-60˚C
Amperage Rating:
15A
Installation Category:
Flush
Special Features:
Tamper resistant, auto-ground
Closure Type:
Maintained
Illumination:
Neon pilot
Product Type:
Combination Switch/Receptacle
Product Material:
Thermoplastic/PVC
Department:
Electrical
Product Group:
Wiring Devices
Product Width:
1.08 inches
Product Height:
4.19 inches
Voltage Rating:
120V - 125V
Connection Type:
Screw
Configuration:
Duplex, Single-Pole
Product Subgroup:
Combination Devices
Product Length:
1.3 in
Application:
Commercial

Cooper Wiring Devices TR274V – Frequently Asked Questions

1) Will the Cooper TR274 land on #12 branch circuit wire, and can I back-wire it?
It takes #14 through #12 AWG on screw terminals, so a 15A circuit run in #12 lands fine. Wiring is back and side, meaning you can push the conductor into the back clamp or wrap the side screw, which helps in a crowded box where you are stacking a switch leg, a hot, a neutral and a ground.
2) Is this Cooper combination device tamper-resistant for a school or daycare?
Yes, the receptacle half is tamper-resistant, with shutters that block single-probe entry. It is also auto-ground, so the strap bonds through the mounting screws to a grounded metal box, which is useful on old work where the box ground is the only one you have.
3) Which voltage should I order - 120V, 125V or 120/277V?
Three builds are offered and voltage is tied to color: brown TR274B at 120 volts, ivory TR274V at 125 volts, and white TR7730W at 120/277 volts. If you are switching 277V lighting in a commercial building, the white TR7730W is the one to specify.
4) I need a 20-amp combination switch - will the Cooper TR274 work?
No. The Cooper TR274 is a 15A device and should not be used where the spec calls for 20A. For a 20A commercial combination, the Leviton 5334 Series is a 120/277V 20-amp duplex two 1-pole switch.
5) Can I use this Cooper combination device for three-way switching from two locations?
No. The switch half is single-pole, so it controls a load from one location only. For three-way control in a combination device, the Leviton 5241 is a 15A 1-pole plus 3-way duplex combination at 120/277V, and the Leviton 5643-W carries two 3-way switches.
6) I need two switches in one gang instead of a switch and outlet - what should I use in place of the Cooper TR274B?
The Cooper TR274B is a single-pole duplex-style device with a NEMA 5-15R receptacle, so it controls one circuit and gives you an outlet. For two switching functions in a single gang, the Leviton 5634 is a 120/277-volt 15-amp two 1-pole commercial grade AC combination switch in ivory Decora, and the Leviton 5334 is a 120/277-volt 20-amp duplex two 1-pole AC combination switch. Choose by amperage: 15A for the 5634, 20A for the 5334.
7) What is the Leviton equivalent of the Cooper TR274B combination switch with a receptacle and switch in one yoke?
The Cooper TR274B is a 15A single-pole device with a NEMA 5-15R receptacle on a duplex-style yoke, so it puts a switch and an outlet in one opening. The closest Leviton devices in the commercial grade combination family are the 5241, listed as a 15-Amp 1-Pole 3-Way Duplex Combination Switch at 120/277V, and the 5634, listed as a 120/277-Volt 15-Amp two 1-pole commercial grade AC combination switch in ivory Decora. Both of those Leviton units combine two switching functions rather than a switch plus a 5-15R receptacle, so if the box needs an outlet at that location the Cooper device is the one that provides it.
8) The Cooper TR274B is single-pole - what do I use for a three-way application?
The TR274B is a single-pole device, so it will not work as one end of a three-way pair. Leviton's 5241 is listed as a 15-amp 1-pole 3-way duplex combination switch at 120/277V, and the 5643 is a commercial grade combination switch with two 3-way switches, 15A 120/277V, in white. Both keep the 15A commercial grade rating while adding the three-way travelers the Cooper device does not have.
9) Do the Leviton commercial combination switches offer the tamper-resistant receptacle the Cooper TR274B has?
Tamper resistance on the Cooper TR274B applies to its NEMA 5-15R receptacle, which also has auto-ground construction and a neon pilot for circuit indication. The Leviton comparables - the 5241, 5334, 5634 and 5643 - are all commercial grade combination switches that pair switching functions rather than a switch with a 5-15R outlet, so there is no receptacle on them to be tamper-resistant. Where code requires a TR receptacle at the device location, the Cooper unit is the one that satisfies it.
10) What does the neon pilot on this Cooper switch do?
The neon pilot gives a lit indication tied to the switch position, so you can tell at a glance whether a remote load such as an attic fan, closet light or exterior fixture is energized. The switch itself is a maintained-contact type, so it stays where you put it rather than momentary.
11) Will this Cooper combination switch hold up in an unheated warehouse or parking garage?
Operating range is -20 to 60 degrees C, which covers an unconditioned warehouse, garage or mechanical room. Construction is thermoplastic/PVC with brass contacts, and it is built to commercial grade rather than residential.
12) Is this a single-gang device and does it mount flush in a standard box?
It is a flush-mount device measuring 4.19 by 1.08 inches, which is standard single-gang strap geometry, so it drops into a normal one-gang box or one position of a multi-gang box behind a combination plate. You will need a wall plate cut for a switch opening on one side and a duplex opening on the other; plates are ordered separately.
13) Is the Cooper TR274B a Decora-style device like the Leviton 5634?
No. The Cooper TR274B is a duplex style device with flush installation and a maintained closure type, which is the traditional toggle-and-duplex face. The Leviton 5634 is listed as an ivory Decora commercial grade combination switch, which uses the wider rocker face and a decorator wallplate. If you are matching existing plates on a job, the plate opening is the deciding detail - the two are not interchangeable behind the same cover.
14) I need a white 15A commercial combination device to match existing white devices - what are my options?
The Cooper combination switch is offered in white as MPN TR7730W, rated 120/277 volts, alongside brown and ivory versions. On the Leviton side, the 5643 is a commercial grade combination switch with two 3-way switches, 15A 120/277V, in white, and the 5334 series is a 120/277-volt 20-amp duplex two 1-pole AC combination switch. Pick by what the box has to do: the Cooper white device carries a 5-15R receptacle, the Leviton units carry switches only.
15) What colors does the Cooper TR274 come in for matching existing devices?
Brown, ivory and white, ordered as TR274B, TR274V and TR7730W. Note the white version is the 120/277V build, so if you are matching white devices on a 120V-only job, confirm the higher voltage rating is acceptable for your spec.
How fast can I get the Cooper Wiring Devices TR274V 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 TR274V come with a warranty?
Absolutely. The Cooper Wiring Devices TR274V 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 TR274V?
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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