Ith Limiters - ABB UniGear ZS1 Instruction Manual

3.7 Ith Limiters

Figure 28: Auxiliary Ith limiter switch. It may be necessary to move the auxiliary switches into their service position when
the lifting eyebolts have been removed.
It is necessary to adjust the centre of the switch knob of the auxiliary switch to the centre of the pressure relief
flap's hole. Correct value of the adjustment of the auxiliary switches' height in pressed position according to
the particular type of the switch is on the figure A) or B).
11.5 Ith limiter
49.2 Pressure relief flap, made of steel sheet
49.4 Rupture bolt (plastic)
49.5 Socket screw
20
UniGear ZS1 switchgear can optionally be equipped with microswitches on the top of each unit. The
microswitch generates a fault signal immediately when the overpressure flap is being opened.
Reaction time is less then 15ms. The signal from microswitch can be sent directly to circuit-breaker
OFF trigger.
Rapid elimination of the fault along with the metal segregation between compartments and the use of
self-extinguishing materials drastically reduces any possible damage.
A) Valid for crouzet type microswitch
11.5
49.2
49.5
49.4
B) Valid for M1S 6610 type microswitch