TEA - TEB MOTOR RESTART RELAYS
DESCRIPTION
The restart and reacceleration microprocessor based relays TEA and TEB are designed to perform the automatic motor restarting, after control and protection devices opening,as a consequence of a momentary line voltage interruption or drop-out.
The relay TEA is used in association with an holding position command contact, whereas the relay TEB is employed when motor start with START and STOP push buttons is provided.
Both are employed in conjunction with contactor based motor control circuits; the TEB also with circuit breakers having current injection close and trip coils.
This device is housed in a self-estinguishing isolating case, wich can be mounted on a standard supporting rail.
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RTA/D
DESCRIPTION
RTA/D relay controls continuously the insulation to earth of A.C. auxiliary and control circuits fed by a transformer, whose secondary winding is insulated from earth.
The insulation control device RTA/D gives an alarm signal when the insulation resistance of either phase of the secondary winding of transformer drop below the preset value.
Optical signalling:
1 for normal run
1 for alarm
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