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The SIDE-TO-SIDE AUSILIARY CONTACT 1NO+1NC S00 is an accessory module for side-mounting on control/protection devices in S00 size. It is used to add two auxiliary contacts: 1 NO (normally open) and 1 NC (normally closed). In practice, it allows you to signal the status of the device, realize interlocks, or send a consent to relays, PLCs, or control circuits.