MiCOM P436 and P438 deliver high-speed distance, overcurrent, and voltage protection for railway feeders — engineered for 16.7 Hz and 25/50/60 Hz networks that demand precision, stability, and absolute reliability.
Explore MoreA single delay in tripping can cut traction supply, stall trains, and overload upstream substations. Legacy relays struggle with fast faults, long feeder lengths, multi-frequency grids, and complex switching logic — risking safety and uptime across the entire line.
P436 and P438 are digital distance and overcurrent protection relays for railway catenary feeders. P436 covers 16.7 Hz networks. P438 handles 25/50/60 Hz systems. Both deliver fast fault detection, advanced interlocking, bay control, disturbance recording, and deep diagnostics — all in modular Px3x hardware built to thrive in demanding traction substations.
Distance precision. Overcurrent speed. This is railway performance you can count on.
Four zones with forward/reverse reach, startup detection, and wrong-phase protection
DTOC, IDMT, high-set, and directional elements tuned for rail feeders.
Full bay interlocking with checks for unsafe operations.
Operate breakers, isolators, and earthing switches directly from the relay.
Over/under-voltage, frequency, thermal, and SOTF protection.
Supports defrost differential schemes for catenary de-icing.
Fault records, oscillography, overload logs, and condition monitoring.
Modular Px3x hardware — tuned for traction reliability.
Purpose-built for catenary feeders and traction substations.
Ideal for traction networks, resilient for utilities and industrial feeders.
Designed for railway feeders, traction substations, dead-tank transformer zones, and autotransformer-fed lines requiring fast, selective distance protection.
Compatible relays, communication modules, and bay-control components that strengthen coordinated protection and safe operation across railway power systems
Talk to our experts for configuration, setup, or relay modernisation
