20A Weather-Resistant GFCI Receptacle (WR & TR)
- Automatic self-test monitoring helps verify GFCI protection status
- UL/cUL listed under the UL 943 Class A GFCI framework with a 5mA ±1mA trip level
- WR and TR construction supports outdoor and public-facing applications that require both weather resistance and tamper-resistant protection
- NEMA 5-20R configuration with back-wire and side-wire terminal options
- 7 standard colors — White, Black, Ivory, Almond, Grey, Brown, Graphite
- Use with a listed extra-duty in-use cover where required for wet locations
Available Colors
What Is a 20A WR/TR Self-Test GFCI Receptacle?
A self-test 20A weather resistant GFCI receptacle is a NEMA 5-20R, 125V, 20A wall device built for projects that need ground-fault protection together with both weather-resistant and tamper-resistant construction. For WTST20, your source brief identifies the product as a 20A GFCI receptacle with TR shutters, WR protection, and self-test capability for North America B2B use. That makes it a stronger fit for outdoor, damp, wet, and public-facing installations than an indoor-only GFCI model.
Who Should Use This Model
- Contractors sourcing 20A outdoor GFCI replacements
- Distributors building out WR / TR GFCI inventory
- Facility and maintenance buyers handling exterior power points
- Commercial and project buyers who need a 20A NEMA 5-20R WR GFCI rather than a standard indoor device
When to Choose a Different Model
- Choose a 15A WR GFCI receptacle when the project calls for a standard NEMA 5-15R face instead of a 20A T-slot.
- Choose an indoor TR GFCI receptacle when the installation does not require weather-resistant construction.
- Choose a non-TR 20A GFCI receptacle only when the installation location does not fall within the tamper-resistant receptacle requirements that apply to specified 15A and 20A nonlocking receptacle locations.
NEMA 5-20R Weather-Resistant GFCI Specifications
| Product Code | WTST20 |
| Certified Safety | UL, cUL |
| GFCI Type | Self-Test GFCI, Class A GFCI |
| Voltage | 125V |
| Amperage | 20A |
| NEMA | 5-20R |
| Color | White,Ivory,Almond,Black,Grey,Brown,Graphite |
| Finish | Satin |
| Operating Temperature | -35C to 66C(-30F to 150F) |
| Application Sector | Commercial, Multi-Dwelling Unit, Residential |
| Features | Alarm, Self-Test |
| Wiring Method | Back Wire and Side Wire |
| Pole | 2 |
| Wire | 3 |
| Wall Plate Included | Yes |
| Number of Receptacles | 2 |
| Standards & Certifications | UL/CSA, NEMA WD6 |
| Grounding | Self Grounding |
| Trip Level | Class A, 5mA ±1mA |
| Safety Function | Automatic self-test monitoring |
| Tamper Resistant | Yes |
| Weather Resistant | Yes |
| Own US Patents | Yes |
| Face Material | Thermoplastic |
| Body Material | Thermoplastic |
| Terminal | Brass-Hot, Green-Ground, Silver-Neutral |
| Country of Origin | China |
Frequently Asked Questions (FAQ)
What is a 20A weather-resistant self-test GFCI receptacle?
A 20A weather-resistant self-test GFCI receptacle is a NEMA 5-20R wall device that combines Class A ground-fault protection, weather-resistant construction, tamper-resistant shutters, and automatic self-test monitoring in one 20A receptacle. It is used when a project needs a higher-capacity outdoor or moisture-exposed GFCI rather than a standard indoor 15A or non-WR device.
Does a WR GFCI still need an extra-duty in-use cover in wet locations?
Yes. NEC 406.9(B)(1) requires 15A and 20A, 125V and 250V receptacles in wet locations to be weatherproof whether or not a plug is inserted, and the outlet box hood for that purpose must be listed and identified as extra-duty. A WR receptacle improves the device’s durability, but it does not replace the required cover in wet locations.
Are tamper-resistant shutters still required for some outdoor locations?
Yes. NEC 406.12 requires tamper-resistant receptacles for specified 15A and 20A, 125V and 250V nonlocking receptacles in covered locations. When the outdoor installation falls within those covered occupancies or access conditions, a WR receptacle alone is not enough, and a TR feature is still required.
Can this 20A WR GFCI be used on a 15A branch circuit?
No. This is a 20A NEMA 5-20R receptacle, so it should not be used as a standard 15A replacement. For buyer-facing selection, the safe rule is to use a 20A receptacle on a 20A branch circuit and confirm the final installation against the circuit design and adopted code.
Will a standard 15A plug fit into this 20A NEMA 5-20R GFCI?
Yes. A NEMA 5-20R receptacle is designed around the 20A T-slot face pattern, and that format accepts standard 15A straight-blade plug use as well as 20A plug configurations. On a tamper-resistant model, the shutters open when the plug blades apply even pressure during normal insertion.
Does this model include self-testing?
Yes. This receptacle is built as a self-test GFCI, and UL 943 applies to Class A GFCIs intended for personnel protection. That makes it suitable for buyers who want a current self-test 20A WR/TR GFCI instead of an older non-self-test replacement.
Can this receptacle be used outdoors in damp or wet locations?
Yes. This is a weather-resistant GFCI receptacle designed for outdoor, damp, or wet-location applications when it is installed with the required listed weatherproof cover and in accordance with the applicable code and installation conditions. WR construction supports the outdoor rating, but the full installation must still match the enclosure and cover requirements for the location.
What does weather-resistant mean on a GFCI receptacle?
Weather-resistant means the receptacle is built for tougher exposure conditions than a standard indoor device. In your WTST20 brief, WR is tied to exterior-use durability language such as resistance to ultraviolet exposure and corrosion, which is why a WR GFCI is the correct starting point for outdoor and moisture-exposed receptacle selection.
UL Listed 20A WR GFCI Receptacle Applications
Senior & Accessible Homes
Removes the monthly manual test button that many residents skip. Auto-verifies protection every 3 seconds.
UL · cUL · UL 943 Class A
High-Mount & Concealed
Behind appliances, above cabinets, in ceilings — where pressing TEST monthly is impractical. Meets NEC 210.8.
UL · cUL · NEC 210.8
Rentals & Short-Term Stays
Landlords cannot rely on tenants to test monthly. Self-test auto-verifies and simplifies turnover inspections.
UL · cUL · UL 943 Class A
Commercial Washrooms
Facility teams covering many buildings cannot test every device monthly. Auto-denounces end-of-life via LED.
UL · cUL · NEC 210.8(B)
Outdoor 20A Weather-Resistant GFCI Overview
5-Step Quick Wiring Guide for GFCI Receptacles
This is a general wiring reference for standard U.S. GFCI receptacle installation. Always turn off power first and verify local code and product-specific instructions before installation.
- Turn Off Power: Switch off the breaker and verify the electrical box is de-energized with a voltage tester.
- Identify LINE and LOAD: Locate the incoming power cable for the LINE terminals. If a second cable feeds downstream receptacles, identify it as LOAD and use it only when downstream GFCI protection is required.
- Connect the LINE Wires: Connect the incoming hot wire to the brass LINE terminal, the incoming neutral wire to the silver LINE terminal, and the ground wire to the green grounding terminal.
- Connect LOAD Only If Needed: If downstream protection is required, connect the outgoing hot wire to the brass LOAD terminal and the outgoing neutral wire to the silver LOAD terminal. Do not reverse LINE and LOAD.
- Mount and Test the GFCI: Fold the wires neatly into the box, mount the receptacle and wall plate, restore power, press RESET, then press TEST to confirm proper operation before resetting again.
Product Categories
Send the target market, rating, color, quantity, packaging needs, and any TR / WR / OEM requirements before final quotation.
