Table of contents
SIRIUS Innovations
14 System Manual, 01/2011, A8E56203870002-03
5.7 Connection ................................................................................................................................ 513
5.7.1 Connection of 3RU21 overload relay........................................................................................ 514
5.7.2 Connec
tion of 3RB30/3RB31 overload relays .......................................................................... 515
5.8 Operation.................................................................................................................
.................. 516
5.8.1 Setting the c
urrent..................................................................................................................... 516
5.8.2 Setting the tripping
class/ground-fault detection (3RB31) ........................................................ 517
5.8.3 RESET after releas
e ................................................................................................................. 517
5.8.4 TEST func
tion ........................................................................................................................... 520
5.8.5 Res
ponse of the auxiliary contacts ........................................................................................... 522
5.9 Ac
cessories............................................................................................................................... 523
5.9.1
Ac
cessories............................................................................................................................... 523
5.9.2 Terminal s
upport for stand-alone assembly.............................................................................. 524
5.9.2.1 Des
cription ................................................................................................................................ 524
5.9.2.2 Mounting/Disassembl
y.............................................................................................................. 524
5.9.3 Mec
hanical remote RESET (release slide)............................................................................... 527
5.9.3.1 Des
cription ................................................................................................................................ 527
5.9.3.2 Mounting/Disassembl
y.............................................................................................................. 527
5.9.4 Mec
hanical remote RESET (cable release).............................................................................. 529
5.9.4.1 Des
cription ................................................................................................................................ 529
5.9.4.2 Mounting/Disassembl
y.............................................................................................................. 530
5.9.5 Module for el
ectrical remote RESET (3RU21 only) .................................................................. 531
5.9.5.1 Des
cription ................................................................................................................................ 531
5.9.5.2 Connec
ting the remote RESET................................................................................................. 531
5.9.5.3 Mounting/Disassembl
y.............................................................................................................. 532
5.9.6 Sealable
cover .......................................................................................................................... 533
5.9.6.1 Des
cription ................................................................................................................................ 533
5.9.6.2 Mounting..............................................................................................................
...................... 533
5.9.7 Covers for
ring cable lug connections....................................................................................... 535
5.9.7.1 Des
cription ................................................................................................................................ 535
5.10 T
echnical data........................................................................................................................... 536
5.10.1
Performanc
e features................................................................................................................ 536
5.10.1.1 General data
............................................................................................................................. 536
5.10.1.2 Protec
tion functions - overview ................................................................................................. 536
5.10.1.3 Equipment
................................................................................................................................. 537
5.10.1.4 Configuration of load feeders
.................................................................................................... 537
5.10.1.5 Features of overl
oad relays....................................................................................................... 538
5.10.2 3RU21
....................................................................................................................................... 539
5.10.2.1 General technic
al data .............................................................................................................. 539
5.10.2.2 Main c
ircuit ................................................................................................................................ 540
5.10.2.3 Conduc
tor cross-sections main circuit ...................................................................................... 541
5.10.2.4 Auxiliary
circuit .......................................................................................................................... 543
5.10.2.5 Conduc
tor cross sections, auxiliary circuit................................................................................ 544
5.10.3 3RB30/3RB31
........................................................................................................................... 546
5.10.3.1 General technic
al data .............................................................................................................. 546
5.10.3.2 Main c
ircuit ................................................................................................................................ 548
5.10.3.3 Conduc
tor cross-sections main circuit ...................................................................................... 549
5.10.3.4 Auxiliary
circuit .......................................................................................................................... 550
5.10.3.5 Conduc
tor cross sections, auxiliary circuit................................................................................ 551
5.11 D
imension drawings (dimensions in mm) ................................................................................. 552
5.11.1
Dimens
ion drawings for 3RU21 thermal overload relays.......................................................... 552
5.11.2
Dimension drawings for 3RB30/3RB31 solid-state overload relays ......................................... 556
5.12 C
ircuit diagrams ........................................................................................................................ 559
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