3-Industrial Electrical diagram

4. Identification of the device terminals

Method• Power contact:

o Single or double poles device: Identification mark => 1 – 2, 3 – 4.

o Three poles or tetrapolar device: Double identification mark => 1/L1 – 2/T1; ...

MethodControl contacts

  • The units digit designate the function of the contact:

    • Normal – NC => 1 – 2

    • Normal – NO => 3 – 4

    • Special (thermal, delayed, etc.) – NC => 5 – 6

    • Special (thermal, delayed, etc.) – NO => 7 – 8

  • The tens digit designate only for the multi-contacts device by design the order of the contact. E.g. 13 – 14 => fist contact (NO) of the device, 21 – 22 => second contact (NC) of the device...

MethodControl part

  • Coil: A1 – A2

  • Pilot Lamp: X1 – X2

MethodTerminal board

X (Si terminal board) . (Si terminal)

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