Ⅰ: Code of product series: three-digit

     163: series 163 micro swich of spring structure

Ⅱ: Rating: double-digit

      (in accordance with IEC61058)

Ⅲ: Used temperature range: single-digit

      0: T55    1: 25T85    

Ⅳ: Loop: single-digit

     1: SPDT   2: SPST-NC  3: SPST-NO

Ⅴ: Type of terminal: single-digit

     1: soldering terminal  

     2: PCB terminal, left toward

     3: PCB terminal, right toward 

     4: type 187 quick-connect terminal

     5: type 187 quick-connect and solder terminal

     6: type 250 quick-connect terminal

     7: screwed terminal

     8: type 187 quick-connect vertical terminal    

Ⅵ: Type of handle: double-digit

     00: without handle    01: 01# handle   

     02: 02# handle

Ⅶ: Position of handle: single-digit

     0: without handle  1: standard 

     2: high OP (operating position)

Ⅷ: Operating force (no handle): double-digit

Ⅸ: Derivative code: double-digit

      Including the below, but not limited.

      1: same terminal type or other

          unconventional structures

      2: different operation position

      3: color of button or housing

      4: different electroplating

      5: different contact

      6: customerized requirement

Ⅹ: Type of package: single-digit

      0=plastic bag          1=shrinked plastic package

      2=tape package      3=tube package

      4=foam package      5=undetermined