EA170-31302 Danaher
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The Danaher EA170-31302 is part of the Snaplock Limit Switches series and has a long mount style with a front shaft position. It features a 2NO/2NC gold plated contact arrangement and a maximum current rating of 20 A at 120 Vac. The switch operates between 0°C and 90°C, with a short-term exposure limit of 175°C, and it uses an open conduit entrance connection type.
Internal Product Review
The EA170-31302 is a Danaher Snaplock limit switch suited for dependable position sensing in machine control applications. The DPDT switch type with a 2NO/2NC contact arrangement supports flexible integration in control circuits. Gold-plated contacts promote clean electrical performance, and the 20 A rating at 120 Vac stands out for solid load-handling capability.
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Product Description:
The EA170-31302 is a mechanical limit switch produced by Danaher for the Snaplock Limit Switches series. Designed for machine tools, conveyors, and process equipment, the unit converts predetermined shaft rotation into discrete electrical feedback that can stop motion, index a cycle, or signal a controller. Its housing accepts a front-mounted rotating shaft, allowing small angular movements to trigger the internal contacts without requiring linear cams. This arrangement supports applications in which rotating machine components must activate control circuits at repeatable positions.
Electrical functionality is provided by a contact arrangement of 2NO/2NC, giving two normally open and two normally closed circuits that toggle simultaneously when the trip point is reached. Each pole can handle up to 20 A at 120 VAC, allowing direct switching of modest motor starters or relay coils without auxiliary interfacing. The switch requires a trip torque of 23 in-lb; once that torque is exceeded in the clockwise direction, the contacts change state. A trip travel of 10° specifies the angular displacement needed to activate the snap mechanism. The total travel of 37° sets the mechanical limit before the internal stops are reached. These travel limits help prevent excessive movement of the drive linkage while providing adequate space for reliable contact activation and reset.
The maximum operating temperature is 90 °C, while the minimum operating temperature is 0 °C. The device can tolerate short-term exposure up to 175 °C during soldering or other brief heating procedures. It weighs 3.5 lb, so the mounting bracket must support its static mass and any dynamic load transferred through the driven shaft. Gold-plated contacts resist oxidation in low-energy sensing circuits, and the open conduit entrance accommodates wiring routed through flexible metallic conduit. Long-mount-style hardware positions the body away from the machine frame when additional clearance is required. The clockwise trip direction is paired with 8° of reset travel, which rearms the mechanism after reverse torque is applied. A front shaft orientation provides direct access for rotary actuation, while sealed bushings help protect the moving interface in demanding plant environments.
