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How did they decide on those numbers?


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704acc 
Copper - Posts: 55
Copper spacespace
Joined: March 01, 2005
Location: United States
Posted: June 13, 2005 at 10:54 PM / IP Logged  
I have always wondered how they came up with the numbering system for the contacts of a 12 volt relay.  Anyone know?
Ray Kane
ff-mike 
Copper - Posts: 199
Copper spacespace
Joined: November 15, 2004
Location: United States
Posted: June 14, 2005 at 9:28 AM / IP Logged  
Those numbers are loosely based on DIN, the German standardization body- the same people who defined the sizes of car stereos
Variations from DIN to what we see
Our#     Definition     DIN#
30       Common        87
85       relay coil(-)     85
86       relay coil(+)    86
87       n/o contact     87b
87a      n/c contact    87a
For more information, see Answers.com
704acc 
Copper - Posts: 55
Copper spacespace
Joined: March 01, 2005
Location: United States
Posted: June 14, 2005 at 10:15 PM / IP Logged  
Thanks for the info.  Any logic to why they picked such random numbers?  For instance, does 29, 84, 88 etc.  have any meaning in the "German standardization body"
Ray Kane

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