Omron ZEN Operation Manual page 71

Wiring
48
Inrush Current Considerations
When switching a load with a high inrush current in the ZEN relay
output or transistor output model, such as an incandescent lamp,
suppress the inrush current as shown below.
Countermeasure 1
R
Providing a dark current of
approx. one-third of the rated
value through an incandescent
lamp
Fuse Insertion
The ZEN with transistor output may burn if the load is short-circuited,
therefore, insert a protective fuse in series to the load.
Section 2-2
Countermeasure 2
R
Providing a limiting resistor