EA170-21100 Danaher
Wake Industrial LLC is not an authorized distributor of this product.
The Danaher EA170-21100 is part of the Snaplock Limit Switches series and features a contact arrangement of 2 NO and 2 NC with a silver alloy contact material. It has a maximum ambient temperature of 90°C, a minimum ambient temperature of -20°C, and an enclosure type of NEMA 1/4/13. The switch includes a wide mount style, an overall length of 6.58 inches, and an overall torque of 23 inch-pounds.
Internal Product Review
The EA170-21100 is a Danaher Snaplock limit switch featuring a 2 NO / 2 NC contact arrangement and silver alloy contacts. A NEMA 1/4/13 enclosure and a -20°C to 90°C ambient range support dependable service in demanding machine environments. Form Z contacts make this switch a strong choice for precise industrial position sensing.
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Product Description:
The EA170-21100 is a mechanical limit switch produced by Danaher for the Snaplock Limit Switches series. In automated equipment, it provides a discrete feedback point that confirms machine members have reached a preset position, allowing controllers to start, stop, or interlock motion sequences. The unit uses a cam-operated lever that turns clockwise to actuate internal contacts, and its wide-style mounting base supports installation in existing panel layouts without additional brackets.
This switch carries a contact arrangement of 2 NO / 2 NC, giving two normally open and two normally closed circuits that can independently signal both logic states to a PLC. The enclosure meets the NEMA 1/4/13 classifications, so it resists indoor dust, dripping water, and oil splashes common around conveyors or gearboxes. Silver-alloy tips reduce contact resistance during the rapid snap action built into the Form Z mechanism. Operation is rated across an ambient temperature range from -20 °C to 90 °C, enabling year-round service in unconditioned factories. During actuation, the lever must overcome 23 in-lb of torque, indicating the minimum cam force necessary to ensure positive opening of the contacts. Each indexing adjustment can be set in 7° 30′ increments, and the lever can be positioned anywhere within a 167° sweep to match various cam profiles.
The housing measures 6.58 in long, providing room to route wiring while still fitting inside narrow machine guard channels. From the neutral stop to the mechanical endpoint, the lever covers a full stroke of 37°, yet electrical actuation occurs early at a trip point of 10° and resets at 8°, minimizing cam travel before the signal changes state. The recommended working span is 13° for consistent repeatability, leaving additional overtravel to absorb wear without disturbing the calibrated point. The clockwise operating direction accommodates cams that approach the lever from the corresponding side of the mechanism.
