Ⅰ: Product series: three-digit   

     153: series 153 micro switch

Ⅱ: Rating: double-digit

     (in accordance with IEC61058S)

Ⅲ: Used temperature range: single-digit

      0: T55   1: 25T85    2: 25T125

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 110 quick-connect terminal

     5: PCB terminal, vertical

Ⅵ: Type of handle: double-digit

     00: without handle     01: 1# handle

     02: 2# handle 

Ⅶ: Type of handle assembly: single-digit

     0: without handle 1: external located

     2: internal located

Ⅷ: Operating force: double-digit

     (at the condition of no handle)

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: differente electroplating

      5: differente  contact

      6: customerized requirements

Ⅹ: Type of package: single-digit

      0=plastic bag        

      1=shrinked plastic package

      2=tape package     3=tube package

      4=foam package    5=undetermined