Product Description:

The EA170-31100 is a mechanical limit switch engineered by Danaher within the Snaplock Limit Switches series. Using a rocker-type actuator, the unit toggles when the operating head is driven clockwise, and its Form Z contact arrangement ensures that one circuit is broken while another is made. Inside the zinc-aluminum housing, the switch carries a silver-alloy contact set with two normally open and two normally closed paths, allowing position feedback or safety interlocking in industrial automation systems.

The contact configuration is 2 NO / 2 NC, so two channels can provide redundant status while the other two can interrupt power to a driven load. For motor branch control, the device supports 20 A at 125 VAC, while its NEMA 1, 4, and 13 enclosure ratings indicate protection against dust, splashing fluids, and oil. An operating torque of 23 in-lb must be applied to reach the recommended travel point of 13°, while the snap mechanism trips after 10° of movement for repeatable actuation. The difference between the trip point and recommended travel provides controlled movement after the contacts change state. The long mounting style positions the head away from obstructions, and the standard travel profile suits conveyors, gates, and indexing tables.

The contacts reset after 8° of reverse motion, and the lever permits a full mechanical throw of 37°, providing sufficient margin for overtravel without damaging the cam or bearings. This reset point allows the switch to return to its initial contact state before the actuator reaches its starting position. When used on low-energy DC circuits, the silver-alloy contacts are rated for 5 A at 125 VDC, supporting solenoid or relay logic loops. Clockwise-only operation simplifies cam adjustment because bidirectional actuation is unnecessary. The rocker actuator maintains smooth movement throughout the operating range, while the snap-action mechanism produces a rapid contact transition instead of relying on gradual contact movement.