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The S00/S0 1NO+1NC auxiliary contact block is a plug-in electrical accessory for Siemens SIRIUS devices in sizes S00 and S0, designed to add a normally open contact (1NO) and a normally closed contact (1NC) to the main devices, so as to handle signaling, control, interlocks, and status feedback in switchboards. Siemens indicates for this family plug-in mounting, 45 mm wide, 17 mm deep, IP20 front protection, and connections available in screw or spring versions, depending on the precise product code.