Siemens 3RB12 User manual
Elektronisches Überlastrelais 3RB12
Solid-state overload relay
Relais de surcharge electronique
Relé electronico di sobrecarga
Relè elettronico di sovraccarica
Elektroniska överlastrelä
Betriebsanleitung
Instructions
Bestell-Nr./Order No.: 3ZX1012-0RB12-1AA1
Ausgabe/Edition 01/2003
GWA 4NEB 631 2282-30a
3RB1246-1P
3RB1246-1Q
3RB1246-1E
a10 15
b34 29
c29 24
d46 47
e48 ---
f 4 - - -
100
70
50
∅ 4,5
7, 2
Ic
85
127,5
5
100
Ib
Ia
b
e
a
fc
d
x
y
3ZX1012-0RB12-1AA1
3RB1253-
0F
3RB1257-
0K
3RB1262-
0L
a 120 145 230
b858585
c155 175 190
d 110 105 120
e405070
f∅ 7∅ 9∅ 11
g425270
h3748---
i 125 130 135
j414655
k203040
l 131 151 166
m 7,2 7,2 7,2
n 13 - - - - - -
o 145 160 175
idb
a
g
e
h
km
f
o
IIb
IIa
l
j
n
c
3ZX1012-0RB12-1AA1
III
M
1~
NSB00302a
L1 L2 L3
T1 T2 T3
L
N
3RB12
3ZX1012-0RB12-1AA1
H2
F2 F3 F4
A1
A2
K1E
135
642
135
L1 L2 L3
A2 A1
F5
F1
T1 T2 T3
642
U
W
V
CLASS
97
S1A
95
9896
K1E
S1E
Test/
Reset
K1 Overload
K2 Ground
Fault
Y1Y2
Z1
Z2
5, 10, 15, 20, 25, 30
Ground
Fault
H1 H3
05 07
06 08
Ready
Ground
Fault
Overload
C2
T2/
C1
Y1Y2
Automatic-
Reset
Remote-
Reset
ϑ
Y1
Y2
T1
ϑ
T2/
C1
3UL22
3 RB 12
⇑
⇑
K1E
L1
L2
L3
N
M
3 ~
IV
3RB12
3ZX1012-0RB12-1AA1
V3RB12..-...0
3RB12..-...2
25
30
40
50
60 70 80 90
100
5
10
15
20 25
30
Class
Test/
Reset
G/9401 3RB1246-1EM00
95 96 97 98 08070605
A1 Y1 Y2
A2 T1 T2/C1 C2
Overload
Gnd Fault
Ready
Reset
Gnd Fault
AC 220-240V J- -
3RB12
NC Overload NO NC Gnd Fault NO
A
AB
3ZX1012-0RB12-1AA1
25
30
40
50
60 70 80 90
100
5
10
15
20 25
30
Class
Test/
Reset
G/9401 3RB1246-1EM00
95 96 97 98 08070605
A1 Y1 Y2
A2 T1 T2/C1 C2
Overload
Gnd Fault
Ready
Reset
Gnd Fault
AC 220-240V ϑ↑ ↑
3RB12
NC NO NC NO
A
AB
Tripped
OVL-Warning
3RB12..-...1
3RB12..-...3
VI
3ZX1012-0RB12-1AA1
VIII
VII
x Ie
tA
1
2
5
10
20
50
12 580,7
1
2
5
10
20
50
100
120
s min
15
10
5
CLASS
CLASS 30
25
20
x Ie
1
2
5
10
20
50
12 580,7
1
2
5
10
20
50
100
120
s min
15
10
5
CLASS
tA
CLASS 30
25
20
3ZX1012-0RB12-1AA1
Device description
3ZX1012-0RB12-1AA1 11
English
Limited touch protection
Degree of protection in conformity with IEC 60529:
IP 20 for devices 70 mm
IP 00 for devices > 70 mm
Shock-proof in conformity with DIN VDE 0106, Part
100.
Installation and maintenance by technical personnel
only. Follow the operating instruction!
1 Device description
The 3RB12 electronic overload relay protects electrical
equipment, such as three-phase AC motors and trans-
formers, with three different protection mechanisms.
Overload
protection The 3RB12 compares the motor current actually
flowing with the set current and evaluates the values
in a microprocessor.
Thermistor
protection PTC thermistors in the motor windings sense the motor
temperature. If the thermistor responds, the relay trips.
Earth-fault
protection Versions with internal earth-fault detection are suitable
for service in three-wire systems.
Versions with earth-fault detection by means of an
external summation current transformer are suitable
for service in three-wire and four-wire systems.
WARNING
HAZARDOUS VOLTAGE
CAN CAUSE ELECTRICAL SHOCK
AND BURNS.
DISCONNECT POWER BEFORE PROCEEDING
WITH ANY WORK ON THIS EQUIPMENT.
Installation
12 3ZX1012-0RB12-1AA1
English
2Installation
For dimension drawings, see graphics section, Fig. I
and II.
Mounting position: any
Mounting of 70 mm devices:
■ Snap-on mounting on 35 mm mounting rail in con-
formity with EN 50 022 or
■ srew mounting by means of inserted lugs as
accessory (3RB1900-0B).
Mounting of the 120 mm, 145 mm und 230 mm
devices:
■ Crew mounting integrated in the casing.
■ In addition for 120 mm size:
Baseplate for snap-on fastening on 75 mm mount-
ing rail (3UF1900-0J) available as accessory.
3 Connection
3.1 Main conductor connection
3.1.1 Current range up to 100 A
■ Rated motor currents from 1.25 A to 100 A:
Insert the motor leads per phase through the open-
ings (x) in the unit (see graphics section, Fig. Ia).
■ Rated motor currents less than 1.25 A:
Insert the motor leads per phase through the open-
ings (x), take them back through the loop opening (y)
and insert them again through the openings (x). You
will produce two loops in this way (see graphics sec-
tion, Fig. Ia).
The following table lists the number of loops for the
various rated motor currents.
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