Profimess SW-08 Operating Instructions Manual page 120

Inductive load
There is danger of voltage peaks from
inductive loads when switching off (up
to 10 times the rated voltage). Induc-
tive loads are caused by, e.g.:
n Contactors, relays
n Solenoid valves
n Electric motors
Examples of protective measures:
Fig. 27: Example 1
Fig. 28: Example 2
Capacitive loads
There is a danger of high current
peaks from capacitive loads when
switching-on the switch contact
(exceeding rated current). Capacitive
loads are caused by, e.g.:
Long connecting cables
n
Capacitive consumers
n
Example of protective measure:
23.02.2015
Installation and initial startup
Fig. 29: Protective measure against
capacitive loads
Ohmic loads
There is a danger of high current
peaks from ohmic loads when
switching-on the switch contact. The
reason for this is that the glow filament
has a low resistance at low tempera-
tures. Ohmic loads are caused by, e.g.:
n Filament bulbs
Motors during startup
n
Examples of protective measures:
Fig. 30: Example 1
Fig. 31: Example 2
Contact protection measures
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