The 4TL1-1 Honeywell Toggle Switch features environment-proof sealing and has pull-to-unlock levers. This On Off On Toggle Switch is used in industrial machinery and equipment, construction equipment, test instruments and medical instrumentation. The switching chambers in 4TL1-1 are completely sealed, while its step-design case offers an extra space between the terminals to help prevent shorting.

Toggle Switches are manually actuated by means of a projecting lever, such as mechanical lever, handle or a rocking mechanism. They are available in many different styles and sizes and are generally used in military and commercial aviation, agricultural machinery, and process control applications.