SIEMENS
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Siemens IC 10 · 2017
Overload Relays
SIRIUS 3RB2 Electronic Overload Relays
3RB20, 3RB21 for standard applications
7
1)
If two different conductor cross-sections are connected to one clamping
point, both cross-sections must be in the range specified.
Type
3RB2056, 3RB2153
3RB2066, 3RB2163
Size
S6
S10/S12
Auxiliary circuit
Number of NO contacts
1
Number of NC contacts
1
Auxiliary contacts – assignment
1 NO for the signal "tripped";
1 NC for disconnecting the contactor
Rated insulation voltage
U
i
(pollution degree 3)
V
300
Rated impulse withstand voltage U
imp
kV
4
Auxiliary contacts – contact rating
• NC contact with alternating current AC-14/AC-15,
rated operational current
I
e
at
U
e
:
-
24 V
A
4
-
120 V
A
4
-
125 V
A
4
-
250 V
A
3
• NO contact with alternating current AC-14/AC-15,
rated operational current
I
e
at
U
e
:
-
24 V
A
4
-
120 V
A
4
-
125 V
A
4
-
250 V
A
3
• NC, NO contacts with DC current DC-13,
rated operational current
I
e
at
U
e
:
-
24 V
A
2
-
60 V
A
0.55
-
110 V
A
0.3
-
125 V
A
0.3
-
250 V
A
0.11
• Conventional thermal current
I
th
A
5
• Contact reliability (suitability for PLC control; 17 V, 5 mA)
Yes
Short-circuit protection
• With fuse, operational class gG
A
6
Ground-fault protection (only 3RB21)
The information refers to sinusoidal residual currents at 50/60 Hz.
• Tripping value
I
> 0.75 ×
I
motor
• Operating range
I
Lower current setting <
I
motor
< 3.5 × upper current setting
• Response time
t
trip
(in steady-state condition)
s
< 1
Integrated electrical remote RESET (only 3RB21)
Connecting terminals A3, A4
24 V DC, 100 mA, 2.4 W short-term
Protective separation between auxiliary current paths
acc. to IEC 60947-1
V
300
CSA, UL, UR rated data
Auxiliary circuit – switching capacity
B300, R300
Conductor cross-sections of the auxiliary circuit
Connection type
Screw terminals
Terminal screw
M3, Pozidriv size 2
Operating devices
mm
5 ... 6
Prescribed tightening torque
Nm
0.8 ... 1.2
Conductor cross-sections (min./max.),
1 or 2 conductors can be connected
• Solid and stranded
mm
2
1 × (0.5 ... 4)
1)
, 2 × (0.5 ... 2.5)
1)
• Finely stranded without end sleeve
mm
2
--
• Finely stranded with end sleeve (DIN 46228-1)
mm
2
1 × (0.5 ... 2.5)
1)
, 2 × (0.5 ... 1.5)
1)
• AWG cables, solid or stranded
AWG
2 × (20 ... 14)
Connection type
Spring-type terminals
Operating devices
mm
3.0 x 0.5
Conductor cross-sections (min./max.),
1 or 2 conductors can be connected
• Solid and stranded
mm
2
2 × (0.25 ... 1.5)
• Finely stranded without end sleeve
mm
2
--
• Finely stranded with end sleeve (DIN 46228-1)
mm
2
2 × (0.25 ... 1.5)
• AWG cables, solid or stranded
AWG
2 × (24 ... 16)
© Siemens AG 2016