| Thermistor motor protection relay Compact evaluation unit, 17.5 mm enclosure, spring-type terminals, 1 changeover contact, US = 24 V AC/DC, Auto RESET, suitable for bimetallic switch, supply =output voltage, 1 LED (tripped) |
| product brand name | SIRIUS |
| product category | SIRIUS 3RN2 thermistor motor protection |
| product designation | Thermistor motor protection relay |
| design of the product | Compact evaluation unit, suitable for bimetallic switch (terminal A1 jumpered with root of changeover contact) |
| product type designation | 3RN2 |
| General technical data |
| product function | thermistor motor protection |
| display version LED | Yes |
| 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 according to IEC 60068-2-27 | 11g / 15 ms |
| vibration resistance according to IEC 60068-2-6 | 10 ... 55 Hz: 0.35 mm |
| 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 |
| reference code according to IEC 81346-2 | K |
| Substance Prohibitance (Date) | 05/28/2009 |
| Product Function |
| product function | |
| ● error memory | No |
| ● dynamic open-circuit detection | No |
| ● external reset | No |
| ● auto-RESET | Yes |
| ● manual RESET | No |
| Control circuit/ Control |
| type of voltage of the control supply voltage | AC/DC |
| control supply voltage at AC | |
| ● at 50 Hz rated value | 24 ... 24 V |
| ● at 60 Hz rated value | 24 ... 24 V |
| control supply voltage at DC | |
| ● rated value | 24 ... 24 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 | 1.8 A |
| duration of inrush current peak | |
| ● at 24 V | 2 ms |
| Measuring circuit |
| buffering time in the event of power failure minimum | 40 ms |
| Precision |
| relative metering precision | 9 % |
| 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 | 1 |
| Main circuit |
| operating frequency rated value | 50 ... 60 Hz |
| 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 according to IEC 61000-4-4 | 2 kV (power ports) / 1 kV (signal ports) |
| ● due to conductor-earth surge according to IEC 61000-4-5 | 2 kV (line to ground) |
| ● due to conductor-conductor surge according to IEC 61000-4-5 | 1 kV (line to line) |
| electrostatic discharge according to IEC 61000-4-2 | 6 kV contact discharge / 8 kV air discharge |
| Galvanic isolation |
| design of the electrical isolation | without galvanic isolation |
| galvanic isolation | |
| ● between input and output | No |
| ● between the voltage supply and other circuits | No |
| Connections/ Terminals |
| product component removable terminal for auxiliary and control circuit | Yes |
| type of electrical connection | spring-loaded terminal (push-in) |
| ● for auxiliary and control circuit | spring-loaded terminals (push-in) |
| type of connectable conductor cross-sections | |
| ● solid | 0.5 ... 4 mm² |
| ● finely stranded with core end processing | 0.5 ... 2.5 mm² |
| ● finely stranded without core end processing | 0.5 ... 4 mm² |
| ● at AWG cables solid | 20 ... 12 |
| ● at AWG cables stranded | 20 ... 12 |
| connectable conductor cross-section | |
| ● solid | 0.5 ... 4 mm² |
| ● finely stranded with core end processing | 0.5 ... 2.5 mm² |
| ● finely stranded without core end processing | 0.5 ... 4 mm² |
| AWG number as coded connectable conductor cross section | |
| ● solid | 20 ... 12 |
| ● stranded | 20 ... 12 |
| Installation/ mounting/ dimensions |
| mounting position | any |
| fastening method | screw and snap-on mounting onto 35 mm standard mounting rail |
| height | 100 mm |
| width | 17.5 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 % |
| Certificates/ approvals |
Downloads and manuals |
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| Further information |
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| last modified: | 1/26/2022 |
Date 5/5/2022 | Subject to change without notice © Copyright Siemens 2022 |