FIELD: corrosion protection. SUBSTANCE: apparatus has input filter 1, key member 2, time modulator 3, timer 4, inductance coil 5 inductively connected with transformer winding, two output filters 6 and 10, comparison and control circuit 7, voltage transformer winding 8, rectifier 9, damper diode 11, indicator member 12, separating diodes 13, resistors 14 and protective electrodes 15. 1-2-5-6-13-15; 8-9-10-14-15; 5-7-3-2; 4-3; 6-12. EFFECT: increased efficiency and enhanced reliability in operation. 1 dwg
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