4 Connections     
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(3)  TK4SP Series 
 
 
Does not feature any digital input terminal due to limited number of terminal blocks. 
11Pin Socket(PG-11, PS-11): Sold separately 
(4)  TK4M Series 
 
 
Features one digital input terminal (DI-1) due to limited number of terminal blocks. Supports 
two multi SVs (SV1 and SV2) only. 
(5)  TK4W, TK4H, TK4L Series 
      
※  Digital input is not electrically insulated from internal circuits, so it sholud be insulated when   
connecting other circuits. (photocoupler, relay, independent switch)