In solid earthed system leakage current can go up to short circuit current, here it is restricted to maximum 750 mA . This restricted operating current reduce overall operating efficiency of leakage relay protection.
2.
Some manufacturers of medium-voltage distribution fuses combine the overcurrent protection characteristics of the fusible element with the flexibility of relay protection by adding a pyrotechnic device to the fuse operated by external protective relays.
3.
These advantages command gerkotrones'widespread use in commercial and military applications in on-board, mobile and stationary powerful radio-electronic equipment, in relay protection and automation systems of electrical networks, in electrophysical installations, in power converter technology, etc.
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