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3.6 Fast recovery device
UniGear ZS1 switchgear can optionally be equipped with “Fast Recovery Device”, a specific protection
system.
This system is based on pressure sensors (figure 24), suitably located in the switchgear and directly
connected to the shunt opening release installed in the circuit-breaker operating mechanism (figure
25).
The sensors detect the pressure rise front at the moment of an internal arc and promptly open the
circuit-breaker.
Thanks to the “Fast recovery” system, only the part involved in the fault is selectively excluded in under
100ms (including the circuit-breaker opening time). Rapid elimination of the fault along with the metal
segregation between compartments and the use of self-extinguishing materials drastically reduces
any possible damage.
1
2
3
Figure 24: Pressure sensor Figure 25: Shunt opening release
Figure 26: Fast recovery system Figure 27: Testing equipment
Resetting the auxiliary contacts
1 Pressure reducer
2 Lever for opening the air valve
3 Manometer
Compressed air system
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