Standard EMI filters fail catastrophically during breaker operations as common mode chokes become useless ballast in ungrounded DC networks. Switching surges reach 5-10 kV while standard varistors allow thousands of volts potential during 6 kA faults. New protective modules maintain 520 V clamping with zero ground leakage. This is critical for preventing digital relay failures in substations.
Editorial message
Switchgear reliability now depends on international trade as well as technology. This editorial explores how tariffs, supply chains, and geopolitics shape grid resilience.
