product brand nameSIRIUS
product categorySIRIUS 3RN2 thermistor motor protection
product designationThermistor motor protection relay
design of the productStandard evaluation unit with ATEX approval, open-circuit and short-circuit detection in the sensor circuit, safe disconnection, non-volatile
product type designation3RN2
General technical data
product functionthermistor motor protection
display version LEDYes
at AC in hot operating state1.7 W
at DC in hot operating state1.7 W
insulation voltage for overvoltage category III according to IEC 60664 with degree of pollution 3 rated value300 V
degree of pollution3
surge voltage resistance rated value6 kV
between auxiliary and auxiliary circuit300 V
between control and auxiliary circuit300 V
shock resistance according to IEC 60068-2-2711 g / 15 ms
vibration resistance according to IEC 60068-2-610 ... 55 Hz: 0.35 mm
mechanical service life (operating cycles) typical10 000 000
at 24 V typical100 000
at 230 V typical100 000
thermal current of the switching element with contacts maximum5 A
reference code according to IEC 81346-2K
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 6,6'-di-tert-butyl-2,2'-methylenedi-p-cresol CAS-No. 119-47-1
Net Weight0.159 kg
Product Function
error memoryYes
dynamic open-circuit detectionYes
external resetYes
auto-RESETYes
manual RESETYes
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
control supply voltage at DC rated value24 ... 240 V
initial value0.85
full-scale value1.1
initial value0.85
full-scale value1.1
initial value0.85
full-scale value1.1
at 24 V0.7 A
at 240 V12 A
at 24 V0.25 ms
at 240 V0.2 ms
Measuring circuit
buffering time in the event of power failure minimum40 ms
Precision
relative metering precision2 %
Auxiliary circuit
material of switching contactsAgSnO2
number of NC contacts for auxiliary contacts0
number of NO contacts for auxiliary contacts0
number of CO contacts for auxiliary contacts2
operational current of auxiliary contacts at AC-15 maximum3 A
at 24 V1 A
at 125 V0.2 A
at 250 V0.1 A
Main circuit
operating frequency rated value50 ... 60 Hz
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
continuous current of the DIAZED fuse link of the output relay6 A
Electromagnetic compatibility
due to burst according to IEC 61000-4-42 kV (power ports) / 1 kV (signal ports)
due to conductor-earth surge according to IEC 61000-4-52 kV (line to ground)
due to conductor-conductor surge according to IEC 61000-4-51 kV (line to line)
electrostatic discharge according to IEC 61000-4-26 kV contact discharge / 8 kV air discharge
Galvanic isolation
design of the electrical isolationProtective separation
between input and outputYes
between the outputsYes
between the voltage supply and other circuitsYes
Safety related data
failure rate [FIT] at rate of recognizable hazardous failures (λdd)6.8E-8 1/h
failure rate [FIT] at rate of non-recognizable hazardous failures (λdu)3.08E-7 1/h
average diagnostic coverage level (DCavg)18 %
MTBF97 a
MTTFd303 a
IEC 62061
Safety Integrity Level (SIL) according to IEC 62061SIL 1
PFHD with high demand rate according to IEC 620613.76E-7 1/h
ISO 13849
performance level (PL) according to EN ISO 13849-1c
category according to EN ISO 13849-11
performance level (PL) according to ISO 13849-1PL c
IEC 61508
Safety Integrity Level (SIL) according to IEC 615081
safety device type according to IEC 61508-2Type B
PFDavg with low demand rate according to IEC 615080.0041
Safe failure fraction (SFF)74 %
hardware fault tolerance according to IEC 615080
T1 value for proof test interval or service life according to IEC 615083 a
Connections/ Terminals
product component removable terminal for auxiliary and control circuitYes
type of electrical connectionscrew terminal
for auxiliary and control circuitscrew-type terminals
solid1x (0.5 ... 4 mm²), 2x (0.5 ... 2.5 mm²)
finely stranded with core end processing1x (0.5 ... 4 mm²), 2x (0.5 ... 1.5 mm²)
for AWG cables solid1x (20 ... 12), 2x (20 ... 14)
solid0.5 ... 4 mm²
finely stranded with core end processing0.5 ... 4 mm²
solid20 ... 12
stranded20 ... 12
tightening torque with screw-type terminals0.6 ... 0.8 N·m
Installation/ mounting/ dimensions
mounting positionany
fastening methodscrew and snap-on mounting onto 35 mm DIN rail
height100 mm
width22.5 mm
depth90 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 operation maximum70 %
explosion protection category for dust[Ex t] [Ex p]
explosion protection category for gas[Ex e] [Ex d] [Ex px]