SIRIUS 3RT2 contactors/contactor assemblies
2.8 Technical data
SIRIUS Innovations
230 System Manual, 01/2011, A8E56203870002-03
2.8.1.2 Contact service life of auxiliary and main contacts
Contact service life of auxiliary contacts
This requires operating mechanisms that switch at
random, i.e. not synchronized with the phase angle of the
supply system.
The contact service life is essentially dependent on the
breaking current.
The characteristic curves apply to:
Integrated auxiliary contacts on 3RT20
Auxiliary switch blocks 3RH2911-., 3RH2921-. for
contactors size S00 and S0
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Legend for diagram:
I
a
= Breaking current
I
e
= Rated operational current
1)
Integrated auxiliary contacts (size S0) and contacts in the auxiliary switch blocks for contactors (size S00 and S0): 6 A
2)
Contacts in auxiliary switch blocks for contactors size S00 and S0:4 A
Contact service life of main contacts
Size S00 The characteristic curves show the contact service life
of contactors when switching resistive and inductive
three-phase loads (AC-1/AC-3) as a function of
breaking current and rated operational voltage. This
requires operating mechanisms that switch at
random, i.e. not synchronized with the phase angle of
the supply system.
The rated operational current I
e
in accordance with
utilization category AC-4 (breaking of 6 times the
rated operational current) is specified for a contact
service life of at least 200,000 operating cycles.
If a shorter contact service life is sufficient, the rated
operational current I
e
/AC-4 can be increased.
In the case of mixed operation, i.e. if normal switching
operation (breaking of rated operational current in
accordance with utilization category AC-3) is mixed
with occasional inching (breaking of the multiple rated
operational current in accordance with utilization
category AC-4), the service life of the contacts can be
calculated approximately using the following formula:
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