Required by DGMS in their circular no. 05 dated 13-10-2010. In this circular DGMS insisted Battery Cut off switch as safety feature to minimize risk of accident due to fire.
It should continuously monitor the battery voltage and as soon it detects the battery voltage below 24 Volts, automatically isolates the battery form the electrical system. If it is not done and battery is continued to be used without recharging, its internal structure of cell damages and battery becomes completely unserviceable. In this condition it does not accept the recharging.
If excess current is taken from the Battery in faulty condition, automatically the battery connection should be disconnected, otherwise this may cause fire.
When vehicle is started; current drawn from the battery is very high. This condition should be restricted only for 30 Seconds. Within this period if engine does not start, Battery Cutoff Switch should automatically disconnect the battery supply.
If Battery Cutoff Switch activates; battery should be disconnected from the nearest point. Therefore, for maximum safety, it should be connected nearest to the positive (+) battery terminal.