SIEMENS
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Siemens IC 10 · 2017
Overload Relays
SIRIUS 3RB2 Electronic Overload Relays
3RB20, 3RB21 for standard applications
7
1)
When connecting cable lugs according to DIN 46235 with conductor
cross-sections of 95 mm
2
and more, the 3RT1956-4EA1 terminal cover
must be used to ensure phase clearance,
see page 7/112
.
2)
When connecting cable lugs according to DIN 46234 for conductor cross-
sections from 240 mm
2
, as well as DIN 46235 for cable cross-sections
from 185 mm
2
, the 3RT1956-4EA1 terminal cover must be used to ensure
phase clearance,
see page 7/112
.
Type
3RB2056, 3RB2153
3RB2066, 3RB2163
Size
S6
S10/S12
Main circuit
Rated insulation voltage
U
i
(pollution degree 3)
V
1 000
Rated impulse withstand voltage U
imp
kV
8
Rated operational voltage
U
e
V
1 000
Type of current
• Direct current
No
• Alternating current
Yes, 50/60 Hz
5 %
Current setting
A
50 ... 200
55 ... 250, 160 ... 630
Power loss per unit (max.)
W
0.05
Short-circuit protection
• With fuse without contactor
See "Selection and ordering data", pages 7/109 ... 7/111
• With fuse and contactor
"Short-Circuit Protection with Fuses/Motor Starter Protectors for Motor
Feeders"
see Configuration Manual
.
Protective separation between main and auxiliary current paths
acc. to IEC 60947-1 (pollution degree 2)
• For systems with grounded neutral point
V
690
• For systems with ungrounded neutral point
V
600
Conductor cross-sections of the main circuit
Connection type
Screw terminals with box terminal
Terminal screw
mm
4 mm Allen screw
5 mm Allen screw
Operating devices
mm
4 mm Allen screw
5 mm Allen screw
Prescribed tightening torque
Nm
1 ... 12
20 ... 22
Conductor cross-sections (min./max.),
1 or 2 conductors can be connected
• Solid
mm
2
--
--
• Finely stranded without end sleeve
mm
2
With 3RT1955-4G box terminal:
2 × (1 × max. 50, 1 × max. 70),
1 × (10 ... 70);
With 3RT1956-4G box terminal:
2 × (1 × max. 95, 1 × max. 120),
1 × (10 ... 120)
2 × (50 ... 185),
Front clamping point only:
1 × (70 ... 240);
Rear clamping point only:
1 × (120 ... 185)
• Finely stranded with end sleeve (DIN 46228-1)
mm
2
With 3RT1955-4G box terminal:
2 × (1 × max. 50, 1 × max. 70),
1 × (10 ... 70);
With 3RT1956-4G box terminal:
2 × (1 × max. 95, 1 × max. 120),
1 × (10 ... 120)
2 × (50 ... 185),
Front clamping point only:
1 × (70 ... 240);
Rear clamping point only:
1 × (120 ... 185)
• Stranded
mm
2
With 3RT1955 -4G box terminal:
2 × (max. 70),
1 × (16 ... 70);
With 3RT1956-4G box terminal:
2 × (max. 120),
1 × (16 ... 120)
2 × (70 ... 240),
Front clamping point only:
1 × (95 ... 300);
Rear clamping point only:
1 × (120 ... 240)
• AWG cables, solid or stranded
AWG
With 3RT1955-4G box terminal:
2 × (max. 1/0),
1 × (6 ... 2/0);
With 3RT1956-4G box terminal:
2 × (max. 3/0),
1 × (6 ... 250 kcmil)
2 × (2/0 ... 500 kcmil),
Front clamping point only:
1 × (3/0 ... 600 kcmil);
Rear clamping point only:
1 × (250 kcmil ... 500 kcmil)
• Ribbon cables (Number x Width x Thickness)
mm
With 3RT1955-4G box terminal:
2 × (6 × 15.5 × 0.8),
1 × (3 × 9 × 0.8 ... 6 × 15.5 × 0.8);
With 3RT1956-4G box terminal:
2 × (10 × 15.5 × 0.8),
1 × (3 × 9 × 0.8 ... 10 × 15.5 × 0.8)
2 × (20 × 24 × 0.5),
1 × (6 × 9 × 0.8 ... 20 × 24 × 0.5)
Connection type
Busbar connections
Terminal screw
M8 × 25
M10 × 30
Prescribed tightening torque
Nm
10 ... 14
14 ... 24
Conductor cross-sections (min./max.)
• Finely stranded with cable lug
mm
2
16 ... 95
1)
50 ... 240
2)
• Stranded with cable lug
mm
2
25 ... 120
1)
70 ... 240
2)
• AWG cables, solid or stranded, with cable lug
AWG
4 ... 250 kcmil
2/0 ... 500 kcmil
• With connecting bars (max. width)
mm
15
25
Connection type
Straight-through transformers
Diameter of opening
mm
24.5
--
© Siemens AG 2016