Siemens SIRIUS System Manual

3RT1/3RH1 contactors
SIRIUS System Manual
3-16
GWA 4NEB 430 0999-02b
Electrical service life of
the main
contacts
The rated operational current I
e
is defined in acc. with utilization category
AC-4 (switching off 6 times the rated operational current) for a contact ser-
vice life of approximately 200 000 operating cycles.
If mixed modes are used - in other words, if normal switching mode (the
rated operational current is switched off in acc. with utilization category AC-
3) is mixed with occasional inching mode (several times the rated opera-
tional current is switched in acc. with utilization category AC-4) - the service
life of the contact pieces can be roughly calculated with the following for-
mula:
Key to the formula:
X Contact service life in mixed mode in operating cycles
A Contact service life in normal operation (
I
a
=
I
e
) in operating cycles
B Contact service life in inching mode (
I
a
= a multiple of
I
e
) in operating
cycles
C Percentage of the total number of switching operations accounted for
by inching operations
The following characteristic curves illustrate the contact service life of con-
tactors when switching inductive three-phase loads (AC-3), irrespective of
the breaking current and rated operational voltage. The prerequisites are
arbitrary (i.e. not synchronous with the phase relation of the control station
operating the network).
X
A
1
C
100
---------
A
B
---
1–


⋅
+
-----------------------------------------
=

Siemens SIRIUS Specifications

General

Product brand name	Siemens
Series	SIRIUS
Coil Voltage	24V DC, 110V AC, 230V AC
Switching Capacity	Up to 10A
Mounting Type	DIN rail
Product designation	SIRIUS
Contact Material	Silver alloy
Contact Rating	Varies depending on the specific SIRIUS relay model (e.g., 6 A at 250 V AC, 10 A at 250 V AC)
Switching Voltage	Varies depending on the specific SIRIUS relay model (e.g., 250 V AC, 400 V AC)
Mechanical Life	Up to 10 million operations
Electrical Life	Up to 100, 000 operations
Operating Temperature	-25°C to +55°C
Protection Class	IP20
Size of relay base	Varies depending on the specific SIRIUS relay model