Electronic Time Delay relay with time delay 2 minutes for starting of first compressor and further delay of 30 seconds for starting of second compressor operated on 95- 115 V AC, 50 Hz for EOG AC coaches & 110 + 5 % V AC, 50 Hz for SGAC coaches for Control panel of AC coaches conforming to RDSO specification no RDSO/ PE/ SPEC/ AC/ 0060- 2004, Rev- 0