L3692
Tmax T8
21/39
Doc N°
Mod.
Apparatus
Scale
Page N°
1SDH000682R0002
L3885
L5757
10. Accessories
10.1 Electrical accessories
Shunt opening / closing release (YO/YC) and second shunt opening release (Y02)
Allows the device to be opened or closed by remote control. Given the characteristics of the circuit-breaker operating mechanism, opening (with
the circuit-breaker closed) is always possible, whereas closing is only possible when the closing springs are loaded. Most of the releases can
operate with both direct and alternate current.
This release provides an instantaneous service (*), but can be supplied permanently (**).
In uses where the shunt closing release is supplied permanently, the shunt closing release must be momentarily de-energized in order to reclose
the circuit-breaker after opening (the circuit-breaker operating mechanism is, in fact, fi tted with an anti-pumping device).
Some applications require a very high degree of safety for the remote opening control of the circuit-breaker. Duplication of the control circuit of
the shunt opening release is required in particular. Tmax T8 circuit-breakers can be fi tted with a second shunt opening release in order to achieve
this. The second shunt opening release is located in the same seat as the undervoltage release and its technical characteristics are the same as
the standard shunt opening release.
(*) In the case of instantaneous service, the current impulse must last at least 100 ms.
(**) In the case of permanent power supply to the shunt opening release, wait for at least 30 ms before transmitting the control to the shunt closing release.
Reference fi gure in the electrical circuit diagrams: YO (4) - YC (2) - YO2 (8)
Undervoltage release (YU)
The undervoltage release opens the circuit-breaker when there is a sensible reduction or lack of the voltage that powers it. It can be used for
remote tripping (by means of normally closed pushbuttons), as a lock on closing or to control the voltage in primary or secondary circuits. The
release power supply is therefore branched on the supply side of the circuit-breaker or from an independent source. Circuit-breaker closing is
only allowed with the release powered (the closing lock is obtained mechanically). The release can operate with both direct and alternate current.
Power supply [Un]
24 V DC
30
V
AC/DC
48 V AC/DC
60 V AC/DC
110-120
V
AC/DC
120-127 V AC/DC
220-240
V
AC/DC
240-250
V
AC/DC
380-400
V
AC
440 V AC
Operating limits:
(YO-YO2): 70% ... 110% Un
Standard CEI EN 60947-2.
(YC): 85% ... 110% Un
Circuit-breaker opening takes place with power supply voltage values of the release equivalent to 35 - 70% Un.
Circuit-breaker closing can take place with power supply voltage values of the release equivalent to 85 - 110% Un.
IT can be fi tted with a signalling contact for undervoltage release energized (C. aux YU).
Inrush power consumption (Ps):
DC = 200 W
AC = 200 VA
Continuous power (Pc):
DC = 5 W
AC = 5 VA
Opening time (YU):
30 ms
Insulation voltage
2500V 50 Hz (per 1 min.)
Reference fi gure in the electrical circuit diagrams: YU (6)
Power supply [Un]
24 V DC
30 V AC/DC
48 V AC/DC
60 V AC/DC
110-120 V AC/DC
120-127 V AC/DC
220-240 V AC/DC
240-250 V AC/DC
380-400 V AC
440 V AC
Operating limits
(YO-YO2) : 70…110% Un
(Standard CEI EN 60947-2)
(YC) : 85…110% Un
Inrush power consumption (Ps)
DC = 200 W
Inrush power time ~100 ms
AC = 200 VA
Continuous power (Pc)
DC = 5 W
AC = 5 VA
Opening time (YO - YO2)
(max) 60 ms
Closing time (YC)
(max) 80 ms
Insulation voltage
2500V 50 Hz (for 1 min.)
