Siemens SIRIUS M200D Manual page 157
Industrial controls load feeders and motor starters
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Also See for SIRIUS M200D:
- Operating instructions (4 pages) ,
- Manual (234 pages) ,
- Operating instructions (4 pages)
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If mixed operation is available, i.e. if normal switching operation (breaking of rated operating
current in accordance with utilization category AC-3) is mixed with occasional inching
(breaking of the multiple rated operating current in accordance with utilzation category AC-
4), the service life of the contacts can be calculated approximately with the following formula:
X
A
B
C
P
N
I
a
I
e
Figure 8-2
M200D AS-Interface Standard
Manual, 08/2014, A5E02548958A/RS-AA/004
Contact service life for mixed operation in operating cycles
Contact service life for normal operation (I
Contact service life for inching (I
Proportion of inching operations in the total operations as a percentage
Rated power of three-phase motors at 400 V
Breaking current
Rated operating current
Service life of main contacts for contactor 3RT1017
8.8 Electrical service life of contactor
= I
) in operating cycles
a
e
= multiple of I
) in operating cycles
a
e
Technical data
157
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