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The Thinswitch (Liquid Resistant) - Ejector Safety

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The Thinswitch (Liquid Resistant) - Ejector Safety

The Liquid resistant THINSWITCH® Limit Switch To verify ejector plate return before closing the mould. Mount inside ejector housing and wire to machine controls.


Can also be used for core slides or any place where space is limited. 


The liquid resistant switch uses the same mounting hole locations as the original Thinswitch.

More Information & Product Selection

Smartflow® Thinswitch® Liquid-Resistant Limit Switch is designed to verify ejector plate return in areas where occasional water or oil spray is present. The Thinswitch helps prevent accidental mould close in injection moulding applications by providing a position switch that is tied to the injection moulding machine control. The liquid resistant switch uses the same mounting hole locations as the original Thinswitch.

The Thinswitch has been tested for reliability over 10 million cycles without failure. Two switches can be used in series for larger moulds to ensure the ejector plate return, preventing costly mould damage.

Features and Benefits


  • Prevents costly mould damage

  • Small size - 2.15" L x 1.5" W x 0.18" thick

  • Fits behind ejector plate

  • Requires only 2 screw holes

  • Very economical to install

  • Ten million cycle mechanical life

  • Adjustable operating point

  • Electrical capacity at 250V AC

  • 5 Amps Resistive, 4 Amps Inductive SPDT

  • Approximately 1.8M wire leads stripped and tinned

  • Optional high temperature model- up to 121°C (Standard 79.4°C)

  • U.S. Patent No. 5,446,252


  • Note* The Thinswitch is designed to fit in the standard gap of imperial ejector plates 0.18" Thick. Otherwise it may be necessary to mill a small pocket.


    * For 'None Stock Items to Order' please allow 1 week for delivery *


    Availability: In stock

    Indicates items normally held in stock
    Indicates non-stock items to order

    Part Number Description Stock Item
    W-BB-S-T-222-LR Thinswitch - Liquid Resistant - Standard - 79.4 Degrees C
    W-BB-S-HT-291-LR Thinswitch - Liquid Resistant - High Temperature - 121 Degrees C