TECHNO-ELEC – Specialising in Responsive Relays

TECHNO-ELEC – Specialising in Responsive Relays
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Specialising in Responsive Relays

This article first appeared in the Railway-News magazine Issue 2 2022.

TECHNO-ELEC specialises in designing, manufacturing and selling measuring relays, known as ‘responsive relays’. TECHNO-ELEC is a key partner of electrical traction (metros, tramways, trains, high-speed trains, substations).

We manufacture products for both on-board and trackside applications.



  • Measurement relay design, voltage, current, differential or for specific application, based on Servo-Contact technology
  • Consulting and expertise on choice of features to size the product according to customer needs

Production & Marketing

  • Development, manufacture and sale

Aftersales Service

  • Preventive maintenance (product functional checks)
  • Curative maintenance (expertise and repair, change of worn parts)
  • Specific maintenance contracts

Main Characteristics

  • Operation fields: from 1mA to • 15,000A / from 10mV to 4,000V (AC/DC)
  • Dielectric strength: up to 20,000V 50Hz- 1 min (primary circuit/secondary circuit)
  • High overloads on measuring circuit
  • Fire resistance according to standards NF F16-101-102 & EN 45545
  • Fully operational whatever the direction

Relay Categories

  • Current relays: they are used in applications such as current detection, threshold control, overload detection, ground fault detection, engine start, etc.
  • Voltage relays: they are used in applications such as voltage detection, catenary voltage detection, threshold control, voltage monitoring of battery chargers, etc.
  • Differential relays: they are used in applications such as DC or AC current differential protection, AC or DC voltage differential protection, etc.
  • Custom relays: associated to electronics, we can create more specific relays, such as time- relays on closing or tripping, flashing relays, clipper time relays, etc.

Download the full PDF here.

Other TECHNO-ELEC Documents


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