1.0Electrical Riddlehttps://electrical-riddle.com/faElectrical Riddlehttps://electrical-riddle.com/fa- Electrical Riddlerich600338<blockquote class="wp-embedded-content" data-secret="WVzcirkfB5"><a href="https://electrical-riddle.com/fa/forums/reply/1893/">پاسخ به: Switchgear Riddle No.7 – Outgoing feeder protection inactivity</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://electrical-riddle.com/fa/forums/reply/1893/embed/#?secret=WVzcirkfB5" width="600" height="338" title="“پاسخ به: Switchgear Riddle No.7 – Outgoing feeder protection inactivity” — Electrical Riddle" data-secret="WVzcirkfB5" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script>
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</script>I am not sure , the problem has been arisen from load stabs ( outgoings) . It seems , it has been arisen from line stabs (incoming and on upstream side of 200 Ampere MCCB) .In this case MCCB is not bound to interrupt the fault current on its own upstream side.