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Mill-type limit switches

Control limit track type switches operate at 600 V maximum, ac or dc. Types of operators for these switches are roller lever (460 FPM), standard fork lever (700 FPM), heavy-duty fork lever (340 FPM) and counter, and counter weight with reset for over-hoist applications. Standard spring return switches operate in one direction only (contacts change state when lever is moved in one direction from center).

Crane power circuit limit switches are mounted on a crane trolley to prevent over travel of the crane hook when hoisting. These enclosed switches are available as single and duplex types from 50–500 hp. Power circuit limit switches utilize double-pole double-throw power circuit contacts to disconnect the main power to the hoist motor. On dc applications, a resistor is required with the limit switch to provide dynamic braking.

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Core features of mill-type limit switches

Control limit track type

  • Spring return operation, maintained operation or contact configuration can easily be field converted, minimizing downtime and inventory requirements
  • Double shaft extension provides flexibility of mounting operating lever on either side of switch

Power circuit limit switches

  • NEMA 3R weather-resistant enclosure with U-shaped cover allows for easy access to mechanism
  • Moving and stationary contacts are common to C80 Mill-type DC contactors, eliminating additional spares

Become a motor control master! 

Eaton’s goal is to enhance your product competency, troubleshooting skills and safe operation of motor control products. From beginners who are growing their knowledge to experts who need a refresher, Eaton offers a range of self-guided, eLearning and instructor-led training to meet your individual needs.  

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