COSINUS CMT R1-3000 Betriebsanleitung Seite 27

In relation to the activated resistor value the maximum allowed operational
voltage V may possibly be significantly lower than the maximum voltage of 250 VAC
max
rms / DC due to the maximum power rating of 3 W !
Up to a maximum activated resistor value of 20kΩ the applied voltage must be lower
than the maximum voltage of 250 V to avoid overloading of the resistors.
Limit voltage to be applied according values given in table 1.
Reversely concluded all activated resistors from 30kΩ upwards are protected from
overloading up to the maximum decade voltage of 250 VAC rms / DC.
e) Fuse
The micro-fuse is approved for a nominal current of 400mA. If using the two fuse
connections (far left and right socket), the fuse may trigger at higher currents.
If using the two fuse connections activated resistor values only up to a maximum of
20 Ω are protected from overloading !
Main function of the fuse comprises protection of the decade and equipment from
destruction in case of no or low activated resistors.
In the resistor range from 20 Ω to 30 kΩ applied voltages even far lower than 250
V AC rms / DC may overload the decade independent of using the fuse connections
or not !
refer to limits in table 1.
f) Conformity
The appliance "cmt Mini-Decade R1-3000" conforms to the current version of IEC 61010-
1:2010 (3rd Edition) + Cor.: 2011 und IEC 61010-2-030: 2010 (1st Edition) at date of
print.
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