Siemens SIRIUS 3RT Series - 3 Ru21; General Technical Data

SIRIUS 3RU2/3RB3 overload relays
5.10 Technical data
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
539
5.10.2 3RU21
5.10.2.1 General technical data
Table 5- 38 General technical data for 3RU21 overload relays
Type 3RU21 16 3RU21 26
Size S00 S0
Width 45 mm 45 mm
Tripping in the event of Overload and phase failure
Tripping class according to IEC/EN 60947-4-
1
CLASS 10
Phase loss sensitivity Yes
Overload warning No
Resetting and recovery
 Reset options following tripping
Manual, automatic, and remote RESET
1)
 Recovery time
- Automatic RESET min Depending on the level of the tripping current and the tripping
characteristic curve
- Manual RESET min Depending on the level of the tripping current and the tripping
characteristic curve
- Remote RESET min Depending on the level of the tripping current and the tripping
characteristic curve
Equipment
 Display of operating state on device
Yes, by means of TEST function/switch position indicator slide
 TEST function
Yes
 RESET button
Yes
 STOP button
Yes
Safe operation of motors with
"increased safety" explosion protection type
 EC type examination certificate number
according to Directive 94/9/EC
On request
Ambient temperature
 Storage/transport
°C -55 ... + 80
 Operation
°C -40 ... + 70
 Temperature compensation
°C Up to 60
 Permissible rated current at internal cubicle temperature
- Up to 60 °C % 100 (current reduction is required above +60 °C)
- 60 °C to 70 °C % 87
Repeat terminals
 Coil repeat terminal
Yes Not required
 Auxiliary switch repeat terminal
Yes Not required