product brand nameSIRIUS
product designationsolid-state relay
design of the product1-pole
product type designation3RF21
_1 of the accessories that can be ordered3RF2900-3PA88
_2 of the accessories that can be ordered3RF2920-0HA16
_3 of the accessories that can be ordered3RF2900-0EA18
_4 of the accessories that can be ordered3RF2920-0GA16
_5 of the accessories that can be ordered3RF2920-0FA08
_1 of the accessories that can be orderedterminal cover
_2 of the accessories that can be orderedpower regulator
_3 of the accessories that can be orderedconverter
_4 of the accessories that can be orderedload monitoring
_5 of the accessories that can be orderedload monitoring, basis
General technical data
product functionzero-point switching
power loss [V∙A] maximum28.6 V·A
at AC in hot operating state28.6 W
at AC in hot operating state per pole28.6 W
without load current share typical0.4 W
insulation voltage rated value600 V
surge voltage resistance of main circuit rated value6 kV
protection class IPIP20
protection class IP on the front according to IEC 60529IP20
shock resistance according to IEC 60068-2-2715 g / 11 ms
vibration resistance according to IEC 60068-2-62 g
reference code according to IEC 81346-2Q
Substance Prohibitance (day/month/year)05/28/2009
SVHC substance nameLead CAS-No. 7439-92-1 Lead monoxide (lead oxide) CAS-No. 1317-36-8 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one CAS-No. 71868-10-5 Melamine CAS-No. 108-78-1
Net Weight0.064 kg
Main circuit
number of poles for main current circuit1
number of NO contacts for main contacts1
number of NC contacts for main contacts0
type of voltage of the operating voltageAC
— at 50 Hz rated value48 ... 460 V
— at 60 Hz rated value48 ... 460 V
operating frequency rated value50 ... 60 Hz
relative symmetrical tolerance of the operating frequency10 %
at 50 Hz40 ... 506 V
at 60 Hz40 ... 506 V
operational current rated value maximum20 A
at AC-1 at 400 V rated value20 A
at AC-51 rated value20 A
according to UL 508 rated value20 A
ampacity maximum20 A
operational current minimum100 mA
rate of voltage rise at the thyristor for main contacts maximum permissible500 V/µs
blocking voltage at the thyristor for main contacts maximum permissible1 200 V
reverse current of the thyristor10 mA
derating temperature40 °C
surge current resistance rated value200 A
I2t value maximum200 A²·s
Control circuit/ Control
type of voltage of the control supply voltageDC
control supply voltage 1 at DC rated value maximum permissible30 V
control supply voltage 1 at DC15 ... 24 V
initial value for signal <1> detection15 V
full-scale value for signal<0> recognition5 V
at DC13 mA
control current at DC rated value15 mA
ON-delay time1 ms; additionally max. one half-wave
OFF-delay time1 ms; additionally max. one half-wave
Installation/ mounting/ dimensions
fastening method side-by-side mountingYes
fastening methodscrew fixing
design of the thread of the screw for securing the equipmentM4
tightening torque of fixing screw maximum1.5 N·m
tightening torque [lbf·in] of fixing screw maximum13 lbf·in
height85 mm
width22.5 mm
depth48 mm
Connections/ Terminals
product component removable terminal for auxiliary and control circuitYes
for main current circuitscrew-type terminals
for auxiliary and control circuitscrew-type terminals
— solid2x (1.5 ... 2.5 mm²), 2x (2.5 ... 6 mm²)
— finely stranded with core end processing2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²), 1x 10 mm²
for AWG cables for main contacts2x (14 ... 10)
solid or stranded1.5 ... 6 mm²
finely stranded with core end processing1 ... 10 mm²
— solid1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1 mm²)
— finely stranded with core end processing1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1 mm²)
— finely stranded without core end processing1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1 mm²)
for AWG cables for auxiliary and control contacts1x (20 ... 12)
AWG number as coded connectable conductor cross section for main contacts14 ... 10
for main contacts with screw-type terminals2 ... 2.5 N·m
for auxiliary and control contacts with screw-type terminals0.5 ... 0.6 N·m
for main contacts with screw-type terminals7 ... 10.3 lbf·in
for auxiliary and control contacts with screw-type terminals4.5 ... 5.3 lbf·in
for main contactsM4
of the auxiliary and control contactsM3
for main contacts10 mm
for auxiliary and control contacts7 mm
UL/CSA ratings
operational current according to UL 508 rated value20 A
Electrical Safety
touch protection on the front according to IEC 60529finger-safe, for vertical contact from the front
Ambient conditions
installation altitude at height above sea level maximum1 000 m
during operation-25 ... +60 °C
during storage-55 ... +80 °C
Electromagnetic compatibility
due to burst according to IEC 61000-4-42 kV / 5 kHz, behavior criterion 2
due to conductor-earth surge according to IEC 61000-4-52 kV, behavior criterion 2
due to conductor-conductor surge according to IEC 61000-4-51 kV, behavior criterion 2
due to high-frequency radiation according to IEC 61000-4-6140 dBuV in the frequency range 0.15 ... 80 MHz, behavior criterion 1
field-based interference according to IEC 61000-4-380 MHz ... 1 GHz 10 V/m, behavior criterion 1
electrostatic discharge according to IEC 61000-4-24 kV contact discharging / 8 kV air discharging, behavior criterion 2
conducted HF interference emissions according to CISPR11Class A for industrial environment
field-bound HF interference emission according to CISPR11Class B for the domestic, business and commercial environments
Short-circuit protection, design of the fuse link
of gS fuse for semiconductor protection at NH design usable3NE1813-0; These fuses have a smaller rated current than the semiconductor relays
of full range R fuse link for semiconductor protection at cylindrical design usable5SE1320
of back-up R fuse link for semiconductor protection at NH design usable3NE8015-1
of back-up R fuse link for semiconductor protection at cylindrical design 10 x 38 mm usable3NC1016; These fuses have a smaller rated current than the semiconductor relays
of back-up R fuse link for semiconductor protection at cylindrical design 14 x 51 mm usable3NC1425
of back-up R fuse link for semiconductor protection at cylindrical design 22 x 58 mm usable3NC2220
at NH design usable3NA6801; These fuses have a smaller rated current than the semiconductor relays
at NH design usable noteThese fuses have a smaller rated current than the semiconductor relays
at cylindrical design 10 x 38 mm usableThese fuses have a smaller rated current than the semiconductor relays
at cylindrical design 10 x 38 mm usable noteThese fuses have a smaller rated current than the semiconductor relays
at cylindrical design 14 x 51 mm usable3NW6101-1; These fuses have a smaller rated current than the semiconductor relays
at cylindrical design 14 x 51 mm usable noteThese fuses have a smaller rated current than the semiconductor relays
of NEOZED fuse usable5SE2306; These fuses have a smaller rated current than the semiconductor relays