COSINUS CMT R1-3000 Betriebsanleitung Seite 23

is in the upper "1" position and "off", if the corresponding slide switch is in the lower
"0" position. The resulting total resistor value is calculated by the sum of all single
activated resistors.
refer to the example at the back side of the decade:
connection only the totally activated resistor value R is applied. If you use the left red
and right black connections, there is an additional fuse (with around 0,6 Ω) in series to
the resistor value R. The delay micro-fuse has an operational current of 400 mA.
Fundamentally the decade is a purely passive appliance, which neither has a voltage
monitoring nor shutdown due to overvoltage.
The user has to make sure NOT overloading the decade !
Do not apply any voltage to the decade if there is no activated resistor !
Even with low voltages (and possibly resulting high currents) damage or even
destruction of the decade may occur.
Maximum operation values, which result from the maximum power rating of 3 W, are
given in the chapter "maximum power rating".
Ambient temperature range for use of the decade is from -20 to +60°C (-4 to 140°F).
At high temperatures there may deviations in resistor accuracy of the decade.
This decade is an electrotechnical appliance of protection class II.
[22]
Part from figure on the back side of the
decade:
It displays the connections of the decade.
Right in black is the common connection. If
you additionally use the middle (red)