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11.2.2
Protection functions - overview
Table 11- 2
Protection functions supported by 3RU21 and 3RB30/3RB31 overload relays
Feature
Tripping in the event of overload
Tripping in the event of phase
asymmetry
Tripping in the event of phase failure
Protection of single-phase loads
Tripping in the event of ground fault
by means of
internal ground-fault detection (can
be activated)
SIRIUS Innovations - SIRIUS 3RU2 thermal overload relays / SIRIUS 3RB3 solid-state overload relays
Manual, 09/2014, A5E03656507420A/RS-AA/002
Description
Provides optimum current-dependent
•
protection of loads against impermissibly high
temperature rise due to overload
Provides optimum current-dependent
•
protection of loads against impermissibly high
temperature rise due to phase asymmetry
Minimizes the temperature rise of the three-
•
phase motor in the event of a phase failure
Enables single-phase loads to be protected
•
Provides optimum protection of loads in the
•
event of high-impedance faults to ground
caused by moisture, condensation, damaged
insulation, etc.
Eliminates the need for additional special
•
equipment
Saves space in the control cabinet
•
Reduces wiring time and wiring costs
•
Technical data
11.2 Performance features
3RU21
3RB30/3RB31
✓
✓
✓
✓
✓
✓
✓
--
--
✓
(3RB31 only)
105
- Quick Links:
- 3Ru21 Thermal Overload Relays
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