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14
EN
5.2.1 Limit values for the contact load with resistive load
Gas-filled instruments
Liquid-filled instruments
Maximum rated operating
voltage U
eff
AC 250 V
AC 250 V
Rated operating current
Switch-on current
1 A
1 A
Switch-off current
1 A
1 A
Continuous current
0.6 A
0.6 A
Maximum switching power
30 W, 50 VA
20 W, 20 VA
Do not exceed the limit values. In order to permanently ensure safe operation, the
following load values are recommended:
Voltage
(per IEC 38)
Gas-filled instruments
Liquid-filled instruments
Resistive load
Inductive load
Resistive load
Inductive load
DC/AC
DC
AC
cos ϕ >0.7
DC
AC
cos ϕ >0.7
230 V
100 mA
120 mA
65 mA
65 mA
90 mA
40 mA
110 V
200 mA
240 mA
130 mA
130 mA
180 mA
85 mA
48 V
300 mA
450 mA
200 mA
190 mA
330 mA
130 mA
24 V
400 mA
600 mA
250 mA
250 mA
450 mA
150 mA
The switching current must not be less than 20 mA with low voltages for switching relia-
bility reasons.
For higher loads, and for instruments with liquid-filled cases,
WIKA model 905.1X contact protection relays are recommended.
Overcurrent protectors
The instruments do not provide for incorporated overcurrent protectors. Should protec-
tors be required, the following values in accordance with EN 60947-5-1 are to be
recommended.
■
Voltage 24 V: 2 A
■
Voltage 250 V: 1 A
5.2.2 Contact protection measures
Mechanical contacts must not exceed the specified electrical values for switching
current, switching voltage and switching power independent of each other, not even for
a short time only.
5. Commissioning, operation