TM 5-3610-286-20 Table 2-4. Electrical Components (cont). Type Auxiliary   contactor and  time  relay  - (cont) Rectifier and battery Mechanical  Devices Reference designator d121 d211 d225 d226 d227 d228 d229 d230 d243 d243a d244 d245 d300 n1 s1 s3 s4 s7 S8 s9 s10 s21 Description Auxiliary   contactor Time relay Auxiliary   contactor Auxiliary   contactor Auxiliary   contactor Auxiliary   contactor Auxiliary   contactor Auxiliary    contactor Auxiliary   contactor Auxiliary   contactor Auxiliary   contactor Auxiliary    contactor Rectifier Speed regulating device Magnet Lamina brake Spring preset brake Spring preset brake Spring preset brake Magnet Magnet Function Lower delivery stop and feeder stop Inch  limit Auxiliary pile, brake up Auxiliary pile, brake down Pile hoist motor feeder, brake up Pile hoist motor feeder, brake down Pile hoist motor delivery, brake up Pile hoist motor delivery, brake down Safety  switch,  inching Safety  switch,  inching Safety  switch,  inching Production   control Preset  speed-preselection Solenoid  for  sheet  holding  fingers Main motor brake Main pile feeder brake Auxiliary pile feeder brake Main pile delivery brake Preset,  on Coupling  magnet  feeder,  on-off 2-12