Positional Switch

Positional Switch


a device for closing and opening electric circuits in systems of automatic control by electric drives. A positional switch is actuated by the motion of the mechanism itself. At various points in its travel, the mechanism opens or closes the appropriate contacts of the switch. The operation of the contacts causes signals to actuate the control devices of an automated electric drive.

The simplest and most widely used example of a positional switch in a control circuit is a switch that prevents a mechanism from traveling beyond its normal end position. In this case, the positional switch is called a limit, or end, switch. Positional switches are classified according to their principle of operation as contact (electromechanical) switches and contactless switches, such as induction and capacitance switches.


Komar, M. A. Osnovy elektroprivoda i apparaty upravleniia, 3rd ed. Moscow, 1968.
Ivenskii, Iu. N. Beskontaktnye putevye perekliuchateli v promyshlennoi avtomatike. Moscow, 1971.


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France head coach Philippe Saint-Andre has made two changes and one positional switch to the side that started in the 41-18 win over Canada.
Cov, who were beaten 32-20 by Park at the Butts Park Arena on the opening day of the season, show two changes and one positional switch from the side that started last Saturday's 49-29 win over Blackheath.
The back row sees CJ Stander make the positional switch to blindside - and he's joined byTommy O'Donnell and No8 Robin Copeland, who features in his first derby clash against Leinster.
But he insisted the positional switch was no sweat having started his career as a winger before playing at full-back, sweeper then in midfield.
O'Driscoll's omission inevitably overshadowed a team showing six changes and one positional switch from last weekend's 16-15 defeat in Melbourne.
Head coach Gregor Townsend has made five personnel changes and one positional switch to his starting line-up for the visit of the Blues, with Kellock, Duncan Weir and Jon Welsh all recalled to the side after returning from Scotland duty this week.
When making the positional switch he initially looked to Robinson for inspiration, until realising the highly regarded MacDonald, who won 56 caps for the All Blacks between 2000-08, was a better fit.
Lancaster has made a brave positional switch for the Durban clash by pushing full-back Ben Foden out to the left wing and bringing in Mike Brown at number 15.
SCOTLAND head coach Andy Robinson has made six changes and one positional switch for Saturday's must-win World Cup Pool B clash with England.
Rennie is set to make his first start at openside flanker in a team showing five changes in personnel and one positional switch from that which beat Italy 21-8 in the final RBS 6 Nations fixture on March 19.
There are seven changes from Wales' autumn Test against New Zealand in November, plus a positional switch as Hook moves from centre to full-back.
There has been a positional switch for Sonny Bill Williams, who will play inside Smith at second five-eighth.