Twist-Lock Devices

Shop NEMA locking plugs, receptacles, and connector bodies by exact configuration. Match the NEMA designation, amperage, voltage, pole and wire arrangement, grounding configuration, device type, and environmental rating. A locking device with the same amp rating is not automatically compatible with another configuration, so use the markings and product specification as the primary reference.

How to Match a Twist-Lock Device

Locking devices are designed so the plug and receptacle mechanically engage after insertion and rotation. Start with the existing equipment or circuit marking and match the full NEMA configuration. Do not select a device only because the blades appear similar or the current rating matches.

Read the Full NEMA Designation

In a designation such as L14-30R, “L” identifies a locking configuration, the configuration family identifies the electrical arrangement, “30” indicates the ampere class, and “R” identifies a receptacle. The corresponding plug, connector, or inlet uses its own suffix. Always verify the voltage and conductor arrangement from the actual device marking or manufacturer specification.

Match the Device Type

A receptacle is fixed in a box or equipment, a plug terminates a cord, and a connector body is the cord-end mating device. If the project uses ordinary straight-blade devices instead, browse receptacles. For larger industrial pin configurations, see pin-and-sleeve devices.

Generator and Temporary-Power Connections

For generator connections, match the generator outlet or inlet and the approved transfer equipment to the electrical system. Never energize building wiring by backfeeding through an ordinary receptacle or an improvised cord. Permanent standby or portable-generator connections should use approved transfer or interlock equipment and be installed according to the equipment instructions and applicable electrical requirements.

Outdoor and Wet-Location Installations

The locking mechanism does not automatically make a device weatherproof. Use a box and weatherproof cover or other listed assembly appropriate to the location, and verify the device's environmental rating. Coordinate mounting with device and outlet boxes. For the wider category, browse wiring devices.

Twist-Lock FAQs

Will two 30A locking devices always mate?

No. They must have the same compatible NEMA configuration and matching device types, voltage, poles, wires, and grounding arrangement.

Will a twist-lock plug fit a standard household receptacle?

No. Locking and straight-blade configurations are different device families.

Can I use a locking receptacle outdoors?

Only as part of an assembly rated for the location, with the required box, cover, and environmental protection.