User Manual

SIRIUS 3RU2/3RB3 overload relays
5.10 Technical data
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
537
5.10.1.3 Equipment
Table 5- 35 Equipment on 3RU21 and 3RB20/3RB31 overload relays
Feature Description 3RU21 3RB30/3RB
31
RESET function
 Enables manual or automatic resetting of the relay
✓ ✓
Remote RESET function
 Enables remote resetting of the relay
✓
(by means
of separate
module)
✓
(3RB31 only
with
24 V DC)
TEST function for auxiliary contacts
 Allows easy checking of function and wiring
✓ ✓
TEST function for electronics
 Allows checking of the electronics
-- ✓
Status display
 Indicates the current operating state
✓ ✓
Integrated auxiliary contacts
(1 NO + 1 NC)
 Allow the load to be disconnected in the event of
an irregularity
 Can be used to output signals
✓ ✓
5.10.1.4 Configuration of load feeders
Table 5- 36 Configuration of load feeders 3RU21 and 3RB30/3RB31
Feature Description 3RU21 3RB30/3RB
31
Short-circuit-proof up to 100 kA at
690 V
(in conjunction with the appropriate
fuses or the appropriate motor starter
protector)
 Provides optimum protection of the loads and
operating personnel in the event of short circuits
due to insulation faults or faulty switching
operations
✓ ✓
Electrical and mechanical matching
to 3RT2 contactors
 Simplifies configuration
 Reduces connection outlay and costs
 Enables stand-alone assembly as well as space-
saving direct mounting
✓ ✓
Spring-loaded connection system for
main circuit
 Enables fast connections
 Ensures that connections are vibration-resistant
 Enables maintenance-free connections
✓ ✓
Spring-loaded connection system for
auxiliary circuits
 Enables fast connections
 Ensures that connections are vibration-resistant
 Enables maintenance-free connections
✓ ✓