TradeMaster® Hospital grade duplex self-test GFCI receptacle. NEMA 5-15R configuration number. Conducts an automatic test every three seconds, ensuring it s always ready to protect. If the device fails the test, the indicator light flashes to signal that the GFCI should be replaced. It also has our proven SafeLock protection feature if critical components are damaged and protection is lost, power to the receptacle is disconnected. Thinner than competitors GFCI receptacles leaves more room for wires in the box. Auto-ground clip assures a positive ground to metal box. feed-through wiring configuration allows GFCI to protect downstream receptacles. Prevents line-load reversal miswire no power to the face or downstream receptacles if wired incorrectly. Exceeds UL 943 voltage surge requirements, survives 100x the required UL 3 kA/6 kV voltage surge test cycles. FSUL listed (federal specification WC596). Trip indicator light (red LED) side or internal screw-pressure-plate back wire with 10 to 14 AWG solid or stranded copper wire. Two back-wire holes per terminal. Ground screw has back-wire clamp for easy installation. 10 kA short circuit rating. Mounting screws are shipped captive in the device and wall plate for easier installation. High-impact-resistant thermoplastic construction. Extra-long strap. Button colours match the device face. Dual-direction test and reset buttons. Class-A rated GFCI. Supplied with matching TP wall plate. Supply voltage 125 VAC, 60 Hz. Supply voltage range 102 to 132 VAC. Trip time 0.025 seconds, nominal per UL standard. 20 A feed-through capacity. Meets 2015 UL requirements.