EA170-41100 Danaher
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The Danaher EA170-41100 is a Snaplock Limit Switch with a rocker action type and double pole double throw configuration. It features a contact arrangement of 2NO/2NC using silver alloy butt contacts and supports up to 20 amps at 125 Vac. The switch allows a lever adjust span of 360 degrees with an overall torque of 30 inch-pounds.
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Product Description:
The EA170-41100 is a rotary limit switch manufactured by Danaher for the Snaplock Limit Switches series. In automated machinery, it indicates discrete angular positions, stopping motion or signaling controllers when a cam reaches a preset point. The device connects directly to a rotating shaft and converts mechanical displacement into snap-action electrical outputs that remain available even during a loss of control power. This type of switch is commonly used on conveyors, presses, and indexing tables where reliable position signaling is required.
The switch uses a rocker actuation mechanism to energize a double-pole, double-throw contact stack. Inside, 2NO/2NC silver-alloy butt contacts arranged in DPDT Form Z provide simultaneous normally open and normally closed outputs for redundant feedback. Each channel supports up to 20 A at 125 VAC, so the contacts can switch motor starters or heating loads without interposing relays. Actuating the contact stack requires no more than 30 in-lb of shaft torque. The cam can be positioned anywhere within a full 360° adjustment range, allowing precise triggering in rotary drive systems. A 7°30′ incremental scale on the lever supports repeatable cam positioning.
During operation, the cam should advance through a total travel of 37°. The recommended overtravel is 13°, which provides sufficient contact movement and wiping action. The snap mechanism trips after 10° of rotation and resets once the shaft backs off by 8°, ensuring clear separation before the next operating cycle. The shaft operates in a fixed clockwise direction, which supports consistent switching sequences. The housing uses a standard mount with a reverse shaft configuration. This arrangement allows conduit entry from the front while the rear shaft connects directly to the rotating drive mechanism.
