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<p style="text-align:justify"><span style="font-size:14px">Once the fault current exceeds the pick-up value decided by overcurrent relay discussed in foregoing section, contact 3-4 will shorted. The shorting of this contact can be used to trigger the time delay circuit shown in figure 6.18. The transistor T will conduct when the voltage across the capacitor V<sub>C</sub> &gt; KV + V<sub>BE</sub> and the delay is controlled by the RC charging time. Thus, definite time overcurrent relay is realized. The characteristic of such a relay with in-built instantaneous unit is shown as in figure 6.19.</span></p>