Are your tamper-resistant outlets constantly causing you problems? Tamper resistant outlets were designed to make keep people safe. Conventional tamper-resistant outlets use a spring-loaded ramp shutter mechanism in the body of the receptacle. Sharp plugs can dig into the ramps, making it nearly impossible to insert the plug. With Hubbell’s patented Cam Action Mechanism, when a plug is inserted, the cam slides the insulating barrier out of the way.