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Electromechanical Protection Relays

Advanced protection for critical power systems.

Electromechanical Protection Relays

Mors Smitt protection relays are utility grade digital and analogue relays designed for the protection, control and monitoring of power systems. These relays deliver high accuracy, self-diagnosis and flexible configuration for demanding substation and generation environments.
Timing Relays
Precision time delay relays for protection schemes, featuring digital setting, multiple ranges and high accuracy for substation applications.
Voltage Protection
AC and DC voltage sensing relays for under and overvoltage protection with self-powered and multi-stage digital options.
Auto Reclose and Sync Check
Auto reclose and synchronism check relays for safe circuit breaker reclosing and generator synchronisation after transient power faults.
Pilot Wire
High isolation pilot wire intertrip relays for remote protection tripping with DC sensitivity and AC immunity up to 15 kV.
Current Protection
Sensitive overcurrent and earth fault protection relays with fast reset, wide setting ranges and configurable output contacts.
Frequency Sensing
Multi-stage frequency monitoring relays with ROCOF detection for load shedding and frequency protection on 50 Hz and 60 Hz systems.
Phase Monitoring / Potential Selector
Three phase monitoring and automatic supply changeover relays detecting phase imbalance, reverse sequence and undervoltage with failsafe operation.
High Impedance Differential
High speed differential protection for busbars, generators and transformers with CT supervision, metrosil modules and complete rack solutions.
Transformer Regulation
Automatic voltage regulation and tap changer control relays for single and parallel transformer operation with tap position indication.
ABM Status Input Active Burden Module
Module designed for applications with solid state status inputs wherever a high security signaling is required.

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Our components and systems are compliant with all relevant standards

Mors Smitt products are designed and compliant to the strictest railway directives.
EN 50155 – European Standard for Electronic Equipment used on Rolling Stock

IEC 60571– International Standard for Electronic Equipment used on Rolling Stock with minor deviation equivalent to EN 50155

IEC 61373 – Shock and Vibration for application used in Rolling Stock

EN 50125 – Environmental Condition for Equipment in Rolling Stock

EN 50124 – Isolation condition
Basic requirements clearance and creepage distances

EN 45545 – Fire and Smoke

NFPA130 / ASTM E - Fire and Smoke criteria used in American Market

Mors Smitt is IRIS certified

IRIS (International Railway Industry Standard) Certification™ aims to improve the quality and reliability of the rail products through the supply chain by implementing a global system for the evaluation of companies supplying the rail industry.
Mors Smitt is IRIS certified based on the international standard ISO-22163 (IRIS Revision-4)
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