product brand nameSIRIUS
product designationSolid-state time-delay auxiliary switch
product type designation3RA28
General technical data
size of contactor can be combined company-specificS00, S0, S2, S3
product component semi-conductor outputYok
product extension required remote controlYok
product extension optional remote controlYok
insulation voltage for overvoltage category III according to IEC 60664 with degree of pollution 3 rated value300 V
test voltage for isolation test1,5 kV
degree of pollution3
surge voltage resistance rated value4 kV
test voltage for surge voltage test4.800 V
protection class IP of the terminalIP20
shock resistance according to IEC 60068-2-2715 g / 11 ms
vibration resistance according to IEC 60068-2-610... 59 Hz: 0,35 mm, 60... 150 Hz: 2 g
mechanical service life (operating cycles) typical10.000.000
with contactor 3R.2 of frame size S0010.000.000
with contactor 3R.2 of frame size S010.000.000
with contactor 3R.2 of frame size S210.000.000
with contactor 3R.2 of frame size S310.000.000
electrical endurance (operating cycles) at AC-15 at 230 V typical100.000
with contactor 3R.2 of frame size S00100.000
with contactor 3R.2 of frame size S0100.000
with contactor 3R.2 of frame size S2100.000
with contactor 3R.2 of frame size S3100.000
adjustable time0,05... 100 s
relative setting accuracy relating to full-scale value15 %
ON period/maximum minimum200 ms
recovery time150 ms
reference code according to IEC 81346-2K
active principleelectronic
relative repeat accuracy1 %
influence of the surrounding temperature±1 %
power supply influence±1 %
Substance Prohibitance (day/month/year)10/01/2009
SVHC substance nameLead CAS-Yok. 7439-92-1 Lead monoxide (lead oxide) CAS-Yok. 1317-36-8 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one CAS-Yok. 71868-10-5 Melamine CAS-Yok. 108-78-1
Net Weight94,38 g
Product Function
product function star-delta circuitYok
Control circuit/ Control
type of voltage of the control supply voltageAC/DC
at 50 Hz rated value24... 240 V
at 60 Hz rated value24... 240 V
at 50 Hz24... 240 V
at 60 Hz24... 240 V
control supply voltage frequency 150... 60 Hz
control supply voltage at DC rated value24... 240 V
control supply voltage 1 at DC24... 240 V
initial value0,85
full-scale value1,1
initial value0,85
full-scale value1,1
initial value0,85
full-scale value1,1
design of the surge suppressorwith varistor
Switching Function
ON-delayYok
ON-delay/instantaneous contactYok
passing make contactYok
passing make contact/instantaneous contactYok
OFF delayVar
flashing symmetrically with interval start/instantaneousYok
flashing symmetrically with interval startYok
flashing symmetrically with pulse start/instantaneousYok
flashing symmetrically with pulse startYok
flashing asymmetrically with interval startYok
flashing asymmetrically with pulse startYok
constant clock cycle with pulse startYok
constant clock cycle with interval startYok
variably clocked with pulse startYok
variably clocked with interval startYok
star-delta circuit with delay timeYok
star-delta circuitYok
additive ON-delayYok
passing break contactYok
passing break contact/instantaneousYok
OFF delayYok
OFF delay/instantaneousYok
pulse delayedYok
pulse delayed/instantaneousYok
pulse-shapingYok
pulse-shaping/instantaneousYok
additive ON-delay/instantaneousYok
ON-delay/OFF-delayYok
ON-delay/OFF-delay/instantaneousYok
passing make contactYok
passing make contact/instantaneous contactYok
retrotriggerable with deactivated control signal/instantaneous contactYok
retrotriggerable with switched-on control signalYok
retrotriggerable with switched-on control signal/instantaneous contactYok
retriggerable with deactivated control signalYok
design of the control terminal non-floatingYok
Short-circuit protection
design of the fuse link for short-circuit protection of the auxiliary switch requiredfuse gL/gG: 4 A
Auxiliary circuit
material of switching contactsAgNi
delayed switching1
instantaneous contact0
delayed switching1
instantaneous contact0
delayed switching0
instantaneous contact0
maximum3 A
at 24 V3 A
at 250 V3 A
at 24 V3 A
at 250 V3 A
at 24 V3 A
at 250 V3 A
operational current of auxiliary contacts at DC-131... 0,1
at 24 V1 A
at 125 V0,2 A
at 250 V0,1 A
operating frequency with 3RT2 contactor maximum2.500 1/h
contact rating of auxiliary contacts according to ULB300 / R300
Main circuit
type of voltageAC/DC
Inputs/ Outputs
at the relay outputs switchover delayed/without delayYok
non-volatileYok
ampacity of the output relay at AC-15 at 250 V at 50/60 Hz3 A
at 24 V1 A
at 125 V0,2 A
Electromagnetic compatibility
EMC immunity according to IEC 61812-1Environment A (industrial area)
due to burst according to IEC 61000-4-42 kV network connection / 1 kV control connection
due to conductor-earth surge according to IEC 61000-4-52 kV
due to conductor-conductor surge according to IEC 61000-4-51 kV
field-based interference according to IEC 61000-4-310 V/m
electrostatic discharge according to IEC 61000-4-28 kV
Safety related data
category according to EN 954-1yok
Electrical Safety
protection class IP on the front according to IEC 60529IP20
touch protection on the front according to IEC 60529finger-safe, for dikey contact from the front
type of insulationBasic insulation
Connections/ Terminals
product component removable terminal for auxiliary and control circuitVar
type of electrical connectionscrew terminal
for auxiliary and control circuitscrew-type terminals
solid0,5... 4 mm², 2x (0,5... 2,5 mm²)
finely stranded with core end processing1x (0,5... 2,5 mm²), 2x (0,5... 1,5 mm²)
for AWG cables solid2x (20... 14)
for AWG cables stranded2x (20... 14)
solid0,5... 4 mm²
finely stranded with core end processing0,5... 2,5 mm²
finely stranded without core end processing0,25... 1,5 mm²
solid20... 14
stranded20... 14
Installation/ mounting/ dimensions
mounting positionany (like contactor)
fastening methodclip-on
height38 mm
width45 mm
depth74 mm
— forwards0 mm
— backwards0 mm
— upwards0 mm
— downwards0 mm
— at the side0 mm
— forwards0 mm
— backwards0 mm
— upwards0 mm
— at the side0 mm
— downwards0 mm
— forwards0 mm
— backwards0 mm
— upwards0 mm
— downwards0 mm
— at the side0 mm
Ambient conditions
installation altitude at height above sea level maximum2.000 m
during operation-25... +60 °C
during storage-40... +85 °C
during transport-40... +85 °C
relative humidity during operation0... 95 %