Prior to Use Auto Switch/Internal Circuit Contact Protection Box Specifications Part no. Load voltage Max. load current CD-P12 . Lead wire length . Auto switch connection side 0.5 m Load connection side 0.5 m 24 VDC 50 mA Contact Protection Box Connection Contact Protection Box/Dimensions Contact Protection Box Internal Circuit CD-P12 Contact protection box Contact protection box Contact protection box 2-color indicator circuit Load Blue Brown Load Blue Brown 2-color indicator Load circuit Blue Black Brown Load Blue Brown Load Blue Brown Indicator circuit Indicator circuit Load Blue Brown Contact protection circuit Contact Contact protection circuit protection circuit Load Blue Brown Indicator circuit q t y u No. w e r No. Brown Blue Auto switch side Load side Choke coil Zener diode Reed Auto Switch Contact Protection Box: CD-P12 D-A73/A8, D-A73H/A80H, D-C73/C8, D-E73A/E80A, D-Z73/Z8, 9�ｭA, and D-A9/A9�ｭV type The auto switches above do not have a built-in contact protection circuit. A contact protection box is not required for solid state auto switches due to their construction. q Where the operation load is an inductive load. w Where the wiring length to load is greater than 5 m. Therefore, use a contact protection box with the switch for any of the above cases: The contact life may be shortened (due to permanent energizing conditions.) Even for the built-in contact protection circuit type (D-A54), use the contact protection box when the wiring length to load is very long (over 30 m) and PLC (Programmable Logic Controller) with a large inrush current is used. To connect a switch unit to a contact protection box, connect the lead wire from the side of the contact protection box marked SWITCH to the lead wire coming out of the switch unit. Keep the switch as close as possible to the contact protection box, with a lead wire length of no more than 1 meter. 2-wire (Reed switch) 2-wire (Reed switch) 2-wire (Reed switch) 2-wire (Reed switch) 3-wire (Reed switch, NPN) 2-wire (Reed switch) 2-wire (Reed switch) Internal Circuit Internal Circuit Brown(+) Blue(.) 79