Differential protection that reacts at light speed
MiCOM P54x delivers ultra-fast current differential protection for lines and cables — with optional sub-cycle distance protection for schemes that demand even more reach and certainty.
Explore MoreOn long feeders, every millisecond decides stability
Traditional relays lag on high-speed faults, struggle with channel delays, and fail to stay selective on weak infeed or transformer-fed circuits. The result? Mis-ops, long outages and unstable networks.
Meet MiCOM P54x — high-speed differential done right
The MiCOM P54x family (P543 / P544 / P545 / P546) brings sub-cycle differential protection to overhead lines, cables, transformer feeders and mesh corners. Fiber-based, redundant, and engineered for demanding protection schemes, it supports wide-range channels, advanced logic, broken conductor detection and optional distance protection (B0 variant). Flexible I/O, modular hardware (60TE / 80TE), multiplexer interfaces and powerful logic make it a dependable choice for utilities needing fast, selective and secure protection.
Speed, selectivity and scheme flexibility — built into one platform
From differential to distance, P54x keeps your lines stable and secure
Ultra-fast differential tripping
Protects lines and feeders in sub-cycle time.
Distance protection
B0 variant adds multi-zone distance for complete line coverage.
Rock-solid channel performance
Fiber links from 1 km to 130 km with multiplexer compatibility.
Weak infeed logic
Ensures stability and correct tripping even under low or zero fault current.
Scheme-level intelligence
Programmable logic for interlocking, switching, blocking and automation.
Deep monitoring and diagnostics
Event logs, self-checking and disturbance recording built in.
Engineered for speed and reliability
High-performance differential technology in flexible hardware.
Where MiCOM P54x excels
Suited for utilities that need ultra-fast, channel-based line protection.
Made for utilities. Trusted in heavy industry
Any network that depends on fast line isolation.
Transmission utilities
Differential protection set up with precision
We configure, test and validate P54x settings for every feeder and channel path.
Services
Switchyard Complete Testing, Commissioning & Maintenance
Systems that complete high-speed line schemes
A coordinated range of communication, backup protection, and automation products designed to operate alongside MiCOM P54x, enabling secure differential schemes, channel redundancy, and seamless integration within modern substations.
Upgrade your line protection
Talk to our relay experts to integrate or modernise your network with MiCOM P54x.
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