Planning the electrical installation 71
Protecting the contacts of relay outputs
When you connect inductive loads to the one free relay output, use noise attenuating
circuits (varistors, RC filters [AC] or diodes [DC]) to protect the relay output from transients
caused by switching of inductive loads, and to minimize electromagnetic interference. If
you do not use protective components, the relay output may wear prematurely, and
interference may couple to other control signals causing a malfunction.
Install the protective component as close to the inductive load as possible. Do not install
protective components at the relay outputs.
+24 V DC
+24 V DC
+24 V DC
-
1
2
3
4
1. Relay output
2. Varistor
3. RC filter
4. Diode
Inverter
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