Siemens SIRIUS System Manual

3RT1/3RH1 contactors
SIRIUS System Manual
3-76
GWA 4NEB 430 0999-02b
Selection aid
The following table gives you a comparison of the effects of the different
surge suppressors:
Table 3-29: How surge suppressors work
1) The rate of drop is reduced once or twice to zero for a few ms:
• A safe drop is always ensured in the case of switching without current.
• The contact pieces are subjected to a greater thermal load when switch-
ing with current. When switching at the upper current limit, this can result
in overload.
Surge suppressor
Suitable for
control supply
voltage
Overvoltage
is limited
Effect
Suppression diode/
flywheeling diode
DC 0.6 V
• Off-delay is considerably greater
(6 to 10 times)
• A two-stage drop
1)
cannot be
ruled out in the case of contactors as
of frame size S0
Diode combination:
suppression diode
Zener diode
DC To Zener voltage
• Off-delay is greater (2 to 6 times)
• A 2-stage drop no longer occurs
Varistor
AC/DC To varistor voltage
(current-dependent)
• Off-delay is only slightly greater
(2 to 5 ms)
RC element
AC/DC Corresponds to
the dimensioning
• Off-delay remains unchanged
• Rate of rise in voltage is damped

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