Page 182 - SACE Tmax XT - Catalogue

7/36 SACE TMAX XT LOW VOLTAGE MOLDED CASE CIRCUIT-BREAKERS

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Remote control

Remote resetting - YR
Available on the XT7 M only, the YR reset coil permits the remote resetting of the circuit- breaker after a release
has tripped due to an intervention of the protection relay.
General characteristics
Power supply (Un) AC DC
24V  
110V  
220V  
Operating limits 90%...110% Un
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Remote resetting
Opening and closing release test unit - YO/YC Test Unit
The opening and closing release test unit helps ensure that the releases are running smoothly, to guar-
antee a high level of reliability in controlling circuit-breaker opening. The test unit ensures the service
continuity of the opening and closing releases with a rated operating voltage between 24V and 250V
(AC and DC), in addition to verifying the functioning of the opening and closing coils electronic circuit.
Continuity is checked cyclically at an interval of 30s between tests. The unit has optic signals via LEDs
on the front, which provide the following information:
POWER ON: correct power supply of the YO/YC Test Unit;
OPEN ON: coil switch absent, power supply absent or insufficient, interrupted cables;
SHORT ON: coil switch failure, short-circuited cables;
OPEN and SHORT FLASHING: faulty coil switch or incorrect supply;
OPEN and SHORT OFF: correct operation of the coil switch.
Two relays with one change-over area are also available on board the unit, to allow remote signaling of the
following events:
Test failure - resetting takes place automatically when the alarm stops;
Failure of three tests - resetting occurs only by pressing the manual RESET on the unit.

Devices characteristics
Auxiliary power supply 24...250V AC/DC
Specifications of the signaling relays
Maximum interrupted current 6A
Maximum interrupted voltage 250V AC