Page 179 - SACE Tmax XT - Catalogue

ACCESSORIES 7/33

XT5 and XT6

Shunt opening release – YO
This allows the circuit-breaker to open by means of a permanent electrical control. Release operation is
guaranteed for voltages between 70% and 110% of the rated power supply voltage Un, in both alternat-
ing and direct current. The YO can be permanently supplied.

Undervoltage release – YU
— This allows the circuit-breaker to open when the release is subject either to a power failure or a voltage
Shunt opening drop. As prescribed in the standards, opening is guaranteed when the voltage is between 70% to 35% Un.
release - YO
After tripping, the circuit-breaker can be closed again if the voltage exceeds 85% Un. When the undervolt-
age release is nor energized, neither the circuit-breaker nor the main contacts can be closed. A remote-con-
trolled emergency opening command can be generated by connecting an opening button to the YU.

None of the service releases require screws to be installed. They are extremely easy to fit: just use a
slight pressure on the part indicated in the installation manual. All service releases are available in two
versions:
• cabled (AWG16 - minimum cable section 1,25mm ):
2
—
Undervoltage - for fixed/plug-in circuit-breakers with 1m long cables;
release - YU - for withdrawable circuit-breakers with fixed and moving part connectors;
• not cabled:
2
- for fixed/plug-in circuit-breakers (suggested cables section 1.5 mm ).
For the fixed version of Tmax XT5, the YO and the YU can be mounted as an alternative in the slot on the
left (third pole) or in the slot on the right (first pole) of the operating lever. For the withdrawable version 07
of Tmax XT5, the YO and YU are installed as standard in the first pole. If two different coils are needed in
the same circuit-breakers or the YO or YU are required in the third pole (on the left), an uncabled coil and
the dedicated cables and connectors for the withdrawable version must be ordered.
Instead, for Tmax XT6 in each versions (withdrawable or fixed) YU can be mounted only in the third pole
(on the left) and YO can be mounted only in the first pole (on the right).

YO YO
YU YU
YO YO
XT5 YU YU

YO YO
XT6
YU YU