| Thermistor motor protection relay Standard evaluation unit 22.5 mm enclosure screw terminal 2 change-over contacts US = 24 V-240 V AC/DC Manual/Auto/Remote reset with ATEX approval 2 LEDs (READY/TRIPPED) galvanic isolation Test/reset button Wire break monitoring Short circuit monitoring non-volatile |
| Product brand name | SIRIUS |
| Product category | SIRIUS 3RN2 thermistor motor protection |
| Product designation | Thermistor motor protection relay |
| Design of the product | Standard evaluation unit with ATEX approval, open-circuit and short-circuit detection in the sensor circuit, non-volatile |
| Product type designation | 3RN2 |
| General technical data |
| Display version LED | Yes |
| Power loss [W] for rated value of the current | |
| at AC in hot operating state | 1.7 W |
| at DC in hot operating state | 1.7 W |
| Insulation voltage | |
| for overvoltage category III according to IEC 60664 | |
| — with degree of pollution 3 rated value | 300 V |
| Degree of pollution | 3 |
| Surge voltage resistance rated value | 4 kV |
| Protection class IP | IP20 |
| Shock resistance | |
| acc. to IEC 60068-2-27 | 11g / 15 ms |
| Mechanical service life (switching cycles) | |
| typical | 10 000 000 |
| Electrical endurance (switching cycles) | |
| at AC-15 at 230 V typical | 100 000 |
| Thermal current of the switching element with contacts maximum | 5 A |
| Certificate of suitability relating to ATEX | PTB 15 ATEX 3011 |
| Reference code acc. to DIN 40719 extended according to IEC 204-2 acc. to IEC 750 | K |
| Reference code acc. to DIN EN 81346-2 | K |
| Reference code acc. to DIN EN 61346-2 | K |
| Control circuit/ Control |
| Type of voltage of the control supply voltage | AC/DC |
| Control supply voltage at AC | |
| at 50 Hz rated value | 24 ... 240 V |
| at 60 Hz rated value | 24 ... 240 V |
| Control supply voltage at DC | |
| rated value | 24 ... 240 V |
| Operating range factor control supply voltage rated value at DC | |
| initial value | 0.85 |
| Full-scale value | 1.1 |
| Operating range factor control supply voltage rated value at AC at 50 Hz | |
| initial value | 0.85 |
| Full-scale value | 1.1 |
| Operating range factor control supply voltage rated value at AC at 60 Hz | |
| initial value | 0.85 |
| Full-scale value | 1.1 |
| Inrush current peak | |
| at 24 V | 0.7 A |
| at 240 V | 12 A |
| Duration of inrush current peak | |
| at 24 V | 0.25 ms |
| at 240 V | 0.2 ms |
| Measuring circuit |
| Buffering time in the event of power failure minimum | 40 ms |
| Precision |
| Relative metering precision | 2 % |
| Auxiliary circuit |
| Material of switching contacts | AgSnO2 |
| Number of NC contacts for auxiliary contacts | 0 |
| Number of NO contacts for auxiliary contacts | 0 |
| Number of CO contacts | |
| for auxiliary contacts | 2 |
| Operating current of auxiliary contacts at DC-13 | |
| at 24 V | 1 A |
| at 125 V | 0.2 A |
| at 250 V | 0.1 A |
| Main circuit |
| Operating frequency rated value | 50 ... 60 Hz |
| Outputs |
| Ampacity of the output relay at AC-15 | |
| at 250 V at 50/60 Hz | 3 A |
| Ampacity of the output relay at DC-13 | |
| at 24 V | 1 A |
| at 125 V | 0.2 A |
| Continuous current of the DIAZED fuse link of the output relay | 6 A |
| Electromagnetic compatibility |
| Conducted interference | |
| due to burst acc. to IEC 61000-4-4 | 2 kV (power ports) / 1 kV (signal ports) |
| due to conductor-earth surge acc. to IEC 61000-4-5 | 2 kV (line to ground) |
| due to conductor-conductor surge acc. to IEC 61000-4-5 | 1 kV (line to line) |
| Electrostatic discharge acc. to IEC 61000-4-2 | 6 kV contact discharge / 8 kV air discharge |
| Galvanic isolation |
| Design of the electrical isolation | galvanic isolation |
| Galvanic isolation | |
| between entrance and outlet | Yes |
| between the outputs | Yes |
| between the voltage supply and other circuits | Yes |
| Safety related data |
| Safety Integrity Level (SIL) acc. to IEC 61508 | 1 |
| Performance level (PL) acc. to EN ISO 13849-1 | c |
| Category acc. to EN ISO 13849-1 | 1 |
| Safe failure fraction (SFF) | 74 % |
| Average diagnostic coverage level (DCavg) | 18 % |
| Failure rate [FIT] | |
| at rate of recognizable hazardous failures (λdd) | 0.000000068 1/h |
| at rate of non-recognizable hazardous failures (λdu) | 0.00000031 1/h |
| PFHD with high demand rate acc. to EN 62061 | 0.00000038 1/h |
| PFDavg with low demand rate acc. to IEC 61508 | 0.0041 |
| MTBF | 97 y |
| MTTFd | 303 y |
| Hardware fault tolerance acc. to IEC 61508 | 0 |
| T1 value for proof test interval or service life acc. to IEC 61508 | 3 y |
| Connections/Terminals |
| Product function | |
| removable terminal for auxiliary and control circuit | Yes |
| Type of electrical connection | screw-type terminals |
| Type of connectable conductor cross-sections | |
| solid | 1x (0.5 ... 4.0 mm²), 2x (0.5 ... 2.5 mm²) |
| finely stranded with core end processing | 1x (0.5 ... 4 mm²), 2x (0.5 ... 1.5 mm²) |
| at AWG conductors solid | 1x (20 ... 12), 2x (20 ... 14) |
| Connectable conductor cross-section | |
| solid | 0.5 ... 4 mm² |
| finely stranded with core end processing | 0.5 ... 4 mm² |
| AWG number as coded connectable conductor cross section | |
| solid | 20 ... 12 |
| stranded | 20 ... 12 |
| Tightening torque | |
| with screw-type terminals | 0.6 ... 0.8 N·m |
| Installation/ mounting/ dimensions |
| Mounting position | any |
| Mounting type | screw and snap-on mounting onto 35 mm standard mounting rail |
| Height | 100 mm |
| Width | 22.5 mm |
| Depth | 90 mm |
| Required spacing | |
| with side-by-side mounting | |
| — forwards | 0 mm |
| — Backwards | 0 mm |
| — upwards | 0 mm |
| — downwards | 0 mm |
| — at the side | 0 mm |
| for grounded parts | |
| — forwards | 0 mm |
| — Backwards | 0 mm |
| — upwards | 0 mm |
| — at the side | 0 mm |
| — downwards | 0 mm |
| for live parts | |
| — forwards | 0 mm |
| — Backwards | 0 mm |
| — upwards | 0 mm |
| — downwards | 0 mm |
| — at the side | 0 mm |
| Ambient conditions |
| Installation altitude at height above sea level | |
| maximum | 2 000 m |
| Ambient temperature | |
| during operation | -25 ... +60 °C |
| during storage | -40 ... +85 °C |
| during transport | -40 ... +85 °C |
| Relative humidity | |
| during operation | 70 % |
| Explosion protection category for dust | [Ex t] [Ex p] |
