ITEM NAME:ME-8122 NO NC Momentary Parallel Roller Plunger Actuator Limit Switch AT3C.â— Type: Cross Roller Plunger, Automatic Reset. This Limit Switch can be widely used in various machine to monitor the position of moving parts of machines and plant. â— Color: Black & Blue. â— Hole Center Point Distance: 56mm x 21mm / 2.2" x 0.8" (L W)".