Text version of the page 
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Series ES 51, actuators
Features/Options Features/Options-Actuating speed 0.5 m/s with an actuating angle of 0°
-Projection of plunger adjustable for fine setting of switching point -Actuating speed 0.5 m/s with an actuating angle of 0°-Exact repeatability of switching point-Collar to protect against the entry of foreign bodies
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Plunger collar W
Position switches with safety function
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Adjustable plunger ST
52 Contact variants: switch travel/contacts Contact variants: switch travel/contacts Slow action Slow action 1 NC / 1 NO contact ES 51W 1Ö/1S 1 NC / 1 NO contact ES 51 ST 1Ö/1S