20A Tamper-Resistant Self-Test GFCI Receptacle
- 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
- Tamper-resistant shutters support indoor locations that require TR receptacle protection under NEC 406.12
- NEMA 5-20R configuration with back-wire and side-wire terminal options
- 7 standard colors — White, Black, Ivory, Almond, Grey, Brown, Graphite
- Wall plate included
Available Colors
What Is a 20A TR Self-Test GFCI Receptacle?
A self-test 20A tamper resistant GFCI receptacle is a 125V wall device that combines Class A ground-fault protection, tamper-resistant shutters, and a NEMA 5-20R T-slot face in one indoor receptacle. This ShengYu model is built for projects that need a 20A device format together with TR protection, self-test monitoring, and standard North American wall-device compatibility. It is the right fit when the job calls for a 20A indoor GFCI rather than a 15A face, a non-TR model, or a WR outdoor device.
Who Should Use This Model
- Contractors sourcing 20A indoor TR GFCI replacements
- Distributors building out code-oriented 20A GFCI inventory
- Facility and project buyers comparing 15A vs 20A GFCI device formats
- Hospitality, education, residential, and commercial buyers needing a NEMA 5-20R TR GFCI option
When to Choose a Different Model
- Choose a WR GFCI receptacle when the installation needs weather-resistant construction, because this model is non-WR.
- Choose a 15A TR GFCI receptacle when the project calls for a standard NEMA 5-15R device instead of a 20A NEMA 5-20R face.
- Choose a 20A non-TR GFCI receptacle only when the installation does not fall within the tamper-resistant receptacle requirements that apply to specified 15A and 20A nonlocking receptacle locations under NEC 406.12.
NEMA 5-20R Tamper-Resistant GFCI Specifications
| Product Code | TST20 |
| 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 | None |
| 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 tamper-resistant self-test GFCI receptacle?
A 20A tamper-resistant self-test GFCI receptacle is a 125V wall device that combines Class A ground-fault protection, tamper-resistant shutters, and self-test monitoring in a NEMA 5-20R receptacle format. It is used when a project needs a 20A indoor GFCI with both T-slot device recognition and TR protection.
What does the T-slot on a 20A GFCI outlet mean?
The T-slot identifies the receptacle as a NEMA 5-20R configuration. It distinguishes a 20A receptacle face from a standard 15A receptacle format and signals that the device is intended for 20A receptacle applications rather than a 15A-only face.
Are tamper-resistant shutters required for some 20A indoor installations?
Yes. NEC 406.12 requires listed tamper-resistant receptacles for 15A and 20A, 125V and 250V nonlocking receptacles in specified locations. Public code summaries identify covered examples such as dwelling units, hotel guest rooms and guest suites, child care facilities, and certain education settings, so a 20A TR GFCI is often the correct indoor choice where both GFCI protection and TR compliance are needed.
Can I install this 20A TR GFCI on a standard 15A branch circuit?
No. This is a 20A NEMA 5-20R receptacle, so it should not be specified as a standard 15A replacement. For buyer-facing product selection, the safe rule is to use a 20A receptacle on a 20A branch circuit and verify the circuit design and adopted code before installation.
Will a standard 15A plug fit into this 20A TR receptacle?
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 in addition to 20A plug configurations. On a tamper-resistant model, the shutters open when the plug blades apply even pressure during normal insertion.
Can this 20A TR GFCI be used outdoors?
No. This is a non-WR GFCI receptacle designed for indoor use. If the project requires a device for damp or wet locations, use a weather-resistant GFCI rather than this indoor TR model.
Does this model include self-testing?
Yes. This receptacle is built as a self-test GFCI, and UL states that UL 943 applies to Class A GFCIs intended for personnel protection. That makes this model suitable for buyers who want a current self-test 20A TR GFCI instead of an older non-self-test replacement.
Why can tamper-resistant outlets feel harder to plug into?
Tamper-resistant receptacles use internal shutters that are designed to resist insertion of foreign objects. A plug inserts normally when the blades apply even pressure together, which is why TR outlets may feel firmer than non-TR models during insertion. That resistance is part of the safety function rather than a sign that the receptacle is defective.
Indoor 20A Tamper-Resistant GFCI 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)
UL Listed 20A TR GFCI Receptacle 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.
