Page 181 - SACE Tmax XT - Catalogue

ACCESSORIES 7/35

Undervoltage release – YU
The undervoltage release opens the circuit-breaker when there is a significant voltage drop or power
failure. It can be used for safe remote tripping, for blocking closing or to control the voltage in the pri-
mary and secondary circuits. The power supply for the release is therefore obtained from the supply
side of the circuit-breaker or from an independent source.
Circuit-breaker closing is permitted only when the release is powered. The undervoltage release is an
alternative to the second shunt opening release.
As prescribed in the standards, opening is guaranteed when the voltage is between 70% to 35% Un.
After tripping, the circuit-breaker can be closed again if the voltage exceeds the 85% Un.
— General characteristics
Undervoltage release
Power supply (Un) AC DC
24V  
30V  
48V  
60V  
110V…120V  
120V…127V  
220V…240V  
240V…250V  
380V…400V  -
415V…440V  -
480V…500V  -
Operating limits (IEC60947-2 standards) 70%...100% Un
Inrush power (Ps) 300VA 300W 07
Continuous power (Pc) 3.5VA 3.5W
Opening time (YU)
XT7-XT7 M 30 ms