WIKA 821 Mode D'emploi page 16

5. Commissioning, operation
Inductive load with AC voltage
With AC voltage two protection measures are possible:
Example:
EN Contact protec-
tion measure
with voltage-de-
pendent resistor
VDR
Example:
Contact protec-
tion measure
with RC element
Capacitive load
With capacitive loads elevated make currents arise. These can be reduced by
series-connecting resistors in the supply line.
Examples: Contact protection measure with current-limiting resistor
Contact
U
B
16 Operating instructions pressure gauges with switch contact models 821, 851 or 830 E
Contact
Contact
R
1
Load
Load
Load
Contact
U
B
R
1
Load