SIRIUS 3RU2/3RB3 overload relays
5.8 Operation
SIRIUS Innovations
520 System Manual, 01/2011, A8E56203870002-03
5.8.4 TEST function
Test function for the 3RU21 thermal overload relay
The TEST slide can be used to check whether the operational 3RU21 thermal overload relay
is working properly. The tripping of the relay can be simulated by moving the slide with a
screwdriver. This simulation process opens the NC contact and closes the NO contact,
thereby checking that the auxiliary circuit has been wired to the overload relay correctly.
TEST
Figure 5-5 Testing the TEST function
Resetting
If the overload relay has been set to automatic RESET, the overload relay is automatically
reset when the TEST slide is released. The relay must be reset with the RESET button if it
has been set to manual RESET.
R
E
S
E
T
Figure 5-6 Resetting the TEST function
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