Cooper Wiring Devices AH1221L Key Lock Wall Switch 20A

Product Description

The COOPER WIRING DEVICES AH1221L is a single-pole, specification-grade key lock wall switch rated for 20 amps at 120 to 277 volts AC. It is designed for commercial and industrial applications where controlled access to lighting or load circuits is required. The key lock mechanism prevents unauthorized operation, making it a standard choice in schools, government facilities, warehouses, and other buildings where circuit control must be restricted to authorized personnel. Licensed electricians install this switch as part of branch-circuit wiring under NEC guidelines.

This switch is suited for single-phase branch circuits operating anywhere in the 120 to 277 VAC range, covering the common 120V, 208V, 240V, and 277V voltages found in commercial lighting systems. Its specification grade construction meets the elevated durability and performance standards required for institutional and light-industrial installations. The brown finish is appropriate for matching standard commercial-grade wallplates in matching color families. It is a non-dimmer device intended for on-off switching of resistive and inductive loads.

Key Features

• Key lock operation restricts unauthorized switching of connected circuits
• 20 amp rating supports commercial lighting and load circuits
• Wide voltage range of 120 to 277 VAC accommodates single-phase commercial systems
• Specification grade construction for institutional and industrial environments
• Single-pole, non-dimmer configuration for straightforward on-off control
• Listed to cULus and FULS standards

Compatibility

Designed as a specification-grade replacement or new-installation key lock wall switch for single-pole, single-phase branch circuits rated up to 20 amps and operating between 120 and 277 volts AC in commercial and institutional wiring systems.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize the branch circuit at the panel and verify absence of voltage with a meter before any wiring work. This is a non-dimmer device and must not be used with dimmer-compatible wiring configurations. Secure the device in a compatible single-gang wallbox and use an appropriately rated wallplate for the installation environment.