Sense
A sensing element monitors the relationship between line and neutral current.
3GRACE
GFCI Technology
Explore ground-fault protection, self-test functions and product standards.
HOW GFCI WORKS
Four connected steps.
Under normal conditions, current flowing through line and neutral is balanced. A GFCI is designed to detect an unintended difference and respond through its protection chain.
Detect
The detection circuit evaluates differential current against the protection logic.
Trip
The trip mechanism interrupts the circuit when the designed threshold is reached.
Verify
Self-test designs periodically verify the protection function and communicate status.
USE ENVIRONMENTS
Common protection contexts.
These examples summarize public-safety guidance. Product instructions, locally adopted codes and the authority having jurisdiction determine the installation.
Bathrooms & kitchens
Potentially damp areas and locations near sinks are common GFCI applications.
Garages & basements
Public-safety guidance identifies these locations among common protection areas.
Outdoor locations
Select an appropriate WR model together with a suitable enclosure and cover.
Commercial & OEM programs
Confirm the destination market, circuit, installation and exact certification scope.
CERTIFICATION EVIDENCE
See the certificatesConfirm the exact scope
Review full-page previews for the UL GFCI, ETL product-safety and ISO 9001 quality-management records. Each certificate applies only to the products, operations and marks covered by that document.
UL SolutionsE473989Ground-fault Circuit Interrupters
Intertek ETLControl No. 5023317Electrical Wiring Device Test Reports
ISO 9001IAS25925Q2178R0MQuality Management SystemQUICK ANSWERS
GFCI FAQ
What does GFCI stand for?
GFCI means ground-fault circuit interrupter. It is designed to interrupt a circuit when it detects leakage current associated with a ground fault.
Which standard applies to Class A GFCIs?
UL Solutions identifies UL 943 and CSA C22.2 No. 144.1 for Class A ground-fault circuit interrupters.
Where are GFCIs commonly used?
Common examples include potentially damp areas such as bathrooms, kitchens, garages, basements, outdoor locations and places near sinks. Local adopted codes determine exact requirements.
How often should a GFCI be tested?
The U.S. Consumer Product Safety Commission recommends using the TEST button monthly and following the manufacturer’s instructions.
TECHNICAL GUIDES
Go deeper into GFCI selection.
These technical notes support product conversations without replacing locally adopted codes, installation instructions or model-specific documentation.
PRODUCT CARE
Self-Test GFCI: What the Feature Does
Automatic monitoring and the user-operated TEST button serve different purposes. Know what to check in the instructions for your exact model.CERTIFICATION GUIDE
How to Check a Product Certification Record
A useful certification check connects the exact model, manufacturer, file or report number and applicable product scope.PROJECT PLANNING
What to Include in an Electrical Product Inquiry
A clear first inquiry helps the team compare the right configurations and identify the documents your project needs.GFCI BASICS
What Is a GFCI Outlet?
A ground-fault circuit interrupter is a protective device designed to interrupt power when it detects leakage current that may present an electric-shock risk.PRODUCT SELECTION
15A vs 20A GFCI
The current rating and receptacle face are visible differences, but circuit design, local code and application requirements must drive selection.FEATURE GUIDE