current, voltage, differential and on request
Since 1936, Techno-Elec (Servo-Contact) has been the key partner for electrical traction.
The company has designed and manufactured various voltage and current relays, for on-board or fixed equipment. The relays do not need any auxiliary supply and are usually supplied with one normally-open contact (NO) + one normally-closed contact (NC).
Techno-Elec relays operation is based on the principle of electromechanical magnetic circuit. A flow is created in the magnetic circuit thanks to a current which goes through it, a permanent magnet creates an opposite flow which maintains the contacts in the rest position. As soon as the flow of the magnetic circuit overtakes the one of the permanent magnet, the relay triggers and closes.
The moving armature oscillation on a rectified edge, the armature balancing and the use of a permanent magnet as restoring means, ensure a fast commutation without intermediary position. Our contacts with micrometric settings have pushed back the precision limits.