Siemens SIRIUS System Manual

3RA1 fuseless load feeders
SIRIUS System Manual
GWA 4NEB 430 0999-02b
5-3
5.2 Device descriptions
Fuseless load feeders are combinations of devices consisting of a circuit
breaker for overload and short-circuit protection and a contactor for normal
switching duty.
The 3RA fuseless feeders of SIRIUS are used to switch loads of up to 100 A
and protect them against overload and short circuits.
The feeders always consist of a SIRIUS 3R circuit breaker for motor protec-
tion (3RV) and a motor contactor (3RT).
The different devices can be set up separately and connected electrically by
means of cables. It is simpler to connect the circuit breakers and contactors
mechanically and electrically using ready-made kits.
The circuit breaker and contactor in the combination must be compatible
with each other. It is not permissible to combine contactors and circuit
breakers that are not compatible.
The combinations described below have been tested individually in order to
verify that the specified performance data are correct.
The 3RV circuit breaker provides overload and short-circuit protection;
upstream protective devices are not required for short-circuit currents of up
to 50 kA / 400 V.
The 3RT contactor takes on the normal switching of loads.
Depending on which device combination is selected, coordination type "1" or
"2" is reached.
Coordination type "2", which is the more stringent test, always includes
coordination type "1".
The specifications apply to direct starters and reversing starters.
Device variants
The fuseless load feeders can be set up in 4 frame sizes:
• Frame size S00: width 45 mm; for three-phase induction motors up to
0.75 kW / 400 V, coordination type "2" and 5.5 kW / 400 V, coordination
type "1"
• Frame size S0: width 45 mm; for three-phase induction motors up to
7.5 kW / 400 V, coordination type "2" and 11 kW / 400 V, coordination type
"1"
• Frame size S2: width 55 mm; for three-phase induction motors up to
22 kW / 400 V, coordination type "2" and coordination type "1"
• Frame size S3: width 70 mm; for three-phase induction motors up to
45 kW / 400 V, coordination type "2" and coordination type "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