User Manual

SIRIUS 3RU2/3RB3 overload relays
5.6 Mounting
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
509
5.6.3 Mounting/Disassembly
Direct mounting on 3RT contactor
The diagram below shows an example mounting scenario based on mounting the
3RU21 thermal overload relay, size S0, on the 3RT2 contactor. The contactor/overload relay
combinations can be snapped onto 35 mm DIN rails according to DIN EN 50022.
Table 5- 14 Mounting the 3RU21 overload relay with a screw-type connection system
Step Operating instruction Figure
1 Push the overload relay into the contactor
from below. Attach the two hooks on the
overload relay to the two openings on the rear
of the contactor. This pushes the main current
contacts into the corresponding socket
contacts on the contactor.
2 Screw the contacts tight.
Check that the cable is clamped tight.
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