3RH2921-1DA20

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Auxiliary switch: Terminal designations and identification numbers for auxiliary contacts

Terminal designations

The terminal designations are 2-digit, e.g. 13, 14, 21, 22:

• Tens digit: Sequence digit
  • Related terminals have the same sequence digit
• Units digit: Function digit
  • 1-2 for normally closed contacts (NC)
  • 3-4 for normally open contacts (NO)

Identification numbers

The Ident. No. indicates the number and type of auxiliary contacts, e. g. 40, 31, 22, 13:

• 1st digit: number of normally open contacts (NO)
• 2nd digit: number of normally closed contacts (NC)

Examples:

• 31 = 3 NO + 1 NC
• 40 = 4 NO

Selection aid for mountable auxiliary switch blocks for power contactors and contactor relays

Selection aid see PDF below.