Electromechanical Relays

Electromechanical relays (EMR) are relays where the contacts are physically closed or open by magnetic force. (Please click here for an explanation of relay basics.) In electro-mechanical relays there is a coil on the pole or energizing side of the switch. When this coil is energized the current passing through the coil creates a magnetic field which attracts a movable armature with one or more sets of contacts. This movement physically brings contacts together on a normally open (NO) relay, completing the circuit and allowing the current to flow through the contact, or controlled circuit. On a normally closed (NC) relay this movement separates the contacts thus interrupting the current flow on the contact, or controlled circuit. When the current to the coil is switched off the armature is returned to its default position by a spring or some other force.

Electromechanical relays have the benefit of cleaner ON and OFF conditions without residual electrical resistance and/or current leakage due to the physical distance between contacts acts as a form of insulation.

Sort By:
$76.31
TeSys K control relay - 3 NO + 1 NC - <= 690 V - 250 V DC standard coil
$76.70
TeSys K control relay - 3 NO + 1 NC - <= 690 V - 250 V DC standard coil