Siemens SIRIUS System Manual

3RU11, 3RB10, and 3RB12 overload relays
SIRIUS System Manual
4-14
GWA 4NEB 430 0999-02b
Tripping classes
3RU11
The 3RU11 thermal overload relays are available for normal starting in trip-
ping class 10.
3RB10
The 3RB10 electronic overload relays are available in 2 tripping classes:
Tripping class 10 for normal starting
Tripping class 20 for heavy starting
3RB12
The 3RB12 electronic overload relays can be set to different tripping classes
(5/10/15/20/25/30) on the device.
Phase loss sensitivity
The 3RU11/3RB10/3RB12 overload relays are sensitive to phase imbalance.
Note on explosion protection
For releases and relays with current-sensitive delayed tripping, tripping cha-
racteristics must be available at the installation location.
The releases or relays for machines with cage rotors must be selected in
such a way that the release time in the case of a 3-pole load, which is obtai-
ned from the characteristic for the I
A
/I
N
ratio of the machine to be protec-
ted, is not greater than the safe locked-rotor time t
E
specified on the
machine's test label.
Motors must have equipment that protects them even in the event of the
failure of a line conductor.

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