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• The Zelio RUM from Schneider Electric is a spring return lockable test button for testing contacts with a universal plug-in relay on the base. Displays relay status mechanically. Standard operation sockets do not need to be ordered separately. The supply voltage is 24 V ac and the current is 10 A. Relays are electrical switches that operate using primary functions and electrical impulses to open and close circuits. Relays are sometimes called industrial switches. Green Premium products Mercury-free Can be reached without SVHC