• Global Certificate: ISO 9001 : 2015

Company presentation

monitoring, protecting, measuring, controlling

Experts of custom-made relays

Techno-Elec is specialized in designing, manufacturing and selling measuring relays, called ‘sensitive relays’. Techno-Elec is a key partner of electrical traction (metros, tramways, trains, High Speed Trains TGV, substation) and of other fields such as steel industry, Petrochemical industry, nuclear energy…

Since its transfer to Lorraine, the company has never stopped developing itself by investing in order to create new products and by relying on skilled staff with a strong industrial culture.

Worldwide recognized skills

Thanks to the quality of our products and our permanent will to give our customers the most relevant answers, TECHNO-ELEC reinforces its position in the Global Market and has more than 50% of its turnover in Export business.

Service and maintenance

Strengthened by 80 years of experience, Techno-Elec know-how in terms of sensitive relays is undeniable. Manufacturing reliable material is important but a company which is unable to cope with its products maintenance is nothing.

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Assets and abilities

Always attentive to our customers, and in order to understand and analyse the specific needs of each, we put in place all necessary means to give them the appropriate answers.

Techno-Elec has the indispensable knowledge and know-how to design and manufacture new products.

Built on a human-scale, Techno-Elec is a company where you can have direct contact with the appropriate interlocutor. Thus, we will handle your requests as soon as possible.

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Creation of Servo-Contact Company which manufactures electrical material. Servo-Contact is specialized in specific relays.

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Diplôme Concours Lépine 1935
Diplôme Concours Lépine 1936

Application fields

« On-board » Railway application

Catenary voltage detection relay
Maximum/minimum current detection
Voltage detection relay
Overload current detection relay
Ground fault detection differential relay
Insulation fault detection relay
Current traction brake detection relay
Battery voltage monitoring relay
Current relay monitoring
Differential bars relays from 500 to 5000 amp. in direct current
Simple and chrono-amperometric accelerating relays
Slipping detector and tacho-relay
Various time-relays
Dynamic braking control relay
Selective relays for dual frequency locomotives

Trackside railway application

Pilot line monitoring relay
Ground fault detection relay
Maximum current detection relay
Catenary voltage detection relay
Voltage detection relay

Electrical welding

Electronic timer relays.
Relays which do not operate for an alternative current 10 times higher than the DC operation current.
Milli-ammeter relays with specified caliber.
Current relays for the arc welding and the arc voltage control.

Mines and metallurgy

Control relays, earth relays, alarm relays, leak relays, anti-pumping relays, etc…, for worksites boxes.
Overvoltage relays for electrolytic cells.
Tacho-relays for winches.
Insulation faults detectors locating instrument.


Various miniature relays.
Holding overcurrent relays.
High insulation relays for electronic circuit.
High-speed protection relays for transmitting valves.
Control relays for anode current and grid-current.
Relays graduating the lights assembly energizing.

Aviation and aeronautical installations

Specific relays for the Air Force.
Relays for the air control radars.
Relays for generators.
Relays for specific vehicles.
Remote-control relays for scale-down models.


Relays for lighthouses and beacons which control the blown lights replacement.
Earth-return relays for on-board generators.
Overcurrent relays for winch motor.

Urban planning

Pumping warning relays at maximum and minimum levels.
Remote control relays by P and T line organ.
Flashing relays which signal the works.

Electrical devices

Polarized earth-return relays.
Relays for differential protection.
Insulation control relays in DC and AC currents.
Relays with phase faults.
Relays with high charge difference.

Chemistry and sugar mills

Relays for control of rotation levels and mixers obstruction.
Relays which detect when the synchronism approaches.
Relays for automatic weighing.

Measuring devices

Relays amplifying the relay breaking capacity.

Recent news and references

Rolling stock, substations and multiple electrical installations are equipped with ou relays in more than 60 countries around the world.