440H-S34012 is a safety switch from the Guard Master series of products made by Rockwell Automation. This switch is a two-pole normally open device with a two-hand start initiation. It is used for preventing accidental start-up of machinery and to provide protection from unexpected energization. It also provides an indication of the contact positions, with a yellow light that indicates the switch is in the normal open state and a green light indicating the contact is in the normal closed state. The 440H-S34012 is rated at 18A (Inductive) at 480VAC and has a mechanical life of up to 500,000 operations.