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Limit switch is one type Of " Contact Sensor" , In that there is Normally Open Contact & Normally Close Contact, In limit switch there is Plunger it is Directly Connected to NO & NC Contact if we press the plunger NO contact become NC & NC contact become NO, Working Principle same as Contactor ( DOL starter ) main difference is in contactor There is Coil to attract the Plunger But In Limit Swict Plunger is Operated Mecanically.Limit Switches is used mainly for Safety Purpose & to take Feed back for PLC in Automation industries........

Source(s):In My Plant I have installed limit Switches..

A limit switch is a switch, usually mechanical, that is actuated by a moving part of some machine. Its operation is much like any other switch in that there are contacts that move when a plunger or lever on the outside of the switch is pushed. Internally there is an over center spring mechanism that snaps the switch open or shut in response to a gradual motion of the plunger or lever.

Many limit switches have three terminals. One is the normally closed contact, another the normally open contact, and the third is the common that switches between these two as the mechanism is moved.

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13y ago

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