MiCOM P43x brings fast, dependable line protection with high-precision distance measurement, strong logic, and powerful communication for modern transmission and sub-transmission networks.
Explore MoreOld relays miss swings, misjudge high-resistance faults, struggle with poor CT signals, and slow down during voltage dips. That leads to mis-ops, blind zones, and long restoration times.
P43x delivers adaptive distance protection with fast six-zone coverage, directional logic, power swing blocking, and SOTF readiness. It captures every event with high-resolution recording, supervises breakers, and blocks swings intelligently. With strong comms (IEC 61850 Ed.1/2, PRP/HSR, DNP3, Modbus), rich logic, and modular hardware, it becomes the anchor protection for overhead lines, cables, and mixed feeders.
Every line stays visible, coordinated, and protected
Modular hardware. Sharp measurement. Strong comms
Designed for high-accuracy, high-speed line protection
Wherever lines run, P43x protects
From zone settings to logic — we configure P43x with precision
Compatible protection relays, communication modules, and automation components that enhance coordinated line protection and grid reliability.
Get sizing, pricing, configuration, and expert support—all in one place
