EA780-20100 Danaher
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The Danaher EA780-20100 is a double pole limit switch from the Snaplock Limit Switches series, featuring cam action actuation and a standard mounting style. It has a contact configuration of 2NO / 2NC with sliding silver alloy contacts, and a bronze housing material. The switch operates in both clockwise and counterclockwise directions with an overall torque of 27 lb-in and a recommended travel of 30 degrees.
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Product Description:
The EA780-20100 is a rotary limit switch produced by Danaher as part of the Snaplock Limit Switches series. Used in industrial automation, it establishes angular endpoints for machine elements and provides electrical feedback so controllers can stop, reverse, or sequence motion when a preset position is reached. The housing contains a cam-driven mechanism that converts shaft rotation into discrete electrical changeovers. When installed on a drive shaft, the unit provides repeatable position signaling without requiring external sensors.
Inside the switch, the actuation mechanism uses cam action, meaning a profiled cam lifts or releases the contact carrier as the shaft turns. Shaft motion can be clockwise or counterclockwise to suit the mounting orientation, and a lever adjustment range of 7°30' allows the actuation point to be adjusted relative to the keyway. The contact stack is wired as 2NO / 2NC in a Form Z arrangement, providing make and break paths across a double-pole architecture. During actuation, the drive must overcome 27 lb-in of overall torque produced by cam friction. Once tripped, the mechanism remains latched until the shaft exceeds the recommended rotation of 30°, with the switching event occurring after 18° of shaft movement.
Electrical durability is supported by contacts made from silver alloy, which resists arc erosion when the Form Z paths open or close. The conductive elements slide against each other rather than snap, reducing contact bounce in low-speed cam applications. A cast bronze housing protects the mechanism and attaches to machinery through the series' standard mounting arrangement. Wiring exits through a 1-11 1/2 NPT conduit thread, helping maintain seal integrity in dusty environments. Reset occurs after the shaft returns by 14°, providing predictable clearance before the next operating cycle. The full mechanical span is 90°, providing sufficient range for positioning multiple cams in complex motion sequences without exceeding the structural limits of the mechanism.
