The trip unit is installed in pole mounted circuit breakers. It controls the circuit breaker opening in case of overcurrent.The Digital Trip Unit protects the three ratings of the post-mounted transformer (50 kVA, 100kVA and 160 kVA), whether it be a conventional transformer (no internal protection) or a new transformer with protection (TPC).The micro-controller assesses the transformer temperature in real time, based on the currents in the three phases and the external ambient temperatur

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