Crane Controls - Overhead Crane Parts Suppliers
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Limit Switches

Each series of TER limit switch offered by feature die-cast alloy enclosures, covers and switch-heads with weather-proof gaskets used at every joint. Switch contact points are made of Silver-alloy material, specially designed to facilitate strong starting currents. 
What is the difference between a slow-break and quick-break limit switches?
Mechanical switch operation for quick-break types is instantaneous and not determined by the strength of external control action. For slow-break limit switches control input is transferred as a direct pressure on the moving part of the contacts so break time is directly related to speed of control input, More information limit switches can be found here.