Locking Wiring Devices

Industrial-grade locking devices are built to be durable and efficient for heavy-duty and rugged performance. Locking devices are NEMA-rated for industrial applications and made of high quality materials like thermoplastic, brass, nickel and nylon for high-impact environments. Locking wiring devices are designed to interlock when twisted for a more secure connection and to prevent accidental unplugging. Locking plugs are paired with locking receptacles and locking connectors for a for areas like warehouses, hospitals and hazardous locations.

How Locking Devices Work

Twist lock electrical plugs have to be turned to lock into the matching receptacle or connector to prevent accidental disconnection. The advantage of locking devices over straight blade devices is that they don't get unplugged easily. Often in industrial environments, there is heavy equipment vibration that could potentially cause the plug to dislodge itself from the receptacle. There may also be machinery and foot traffic that could accidentally pull the plug. Locking plugs and locking receptacles prevent these types of electrical hazards. The locking plug is twisted in order to lock into place and then twisted the opposite direction to unplug.

A NEMA-rated locking plug has three curved prongs that goes directly into a locking plug or locking connector. Since there are different types of NEMA configurations, the locking plug needs to exactly match the NEMA code of the receptacle or connector for it to fit. 

  • NEMA locking plugs: L5-20P, L6-20P, L14-20P, L5-30P, L6-30P and L14-30P
  • NEMA locking receptacles: L5-20R, L6-20R, L14-20R, L5-30R, L6-30R and L14-30R
  • NEMA locking connectors: L5-20C, L6-20C, L14-20C, L5-30C, L6-30C and L14-30C