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Overload Relays
3RB2 Solid-State Overload Relays
3RB20, 3RB21 for standard applications
Type
Size
Width
Main circuit
Rated insulation voltage U
i
(degree of pollution 3)
Rated impulse withstand voltage U
Rated operational voltage U
e
Type of current
• Direct current
• Alternating current
Current setting
Power loss per unit (max.)
Short-circuit protection
- With fuse without contactor
- With fuse and contactor
Protective separation between main and auxiliary con-
ducting path acc. to IEC 60947-1 (degree of pollution 2)
Connection for main circuit
Connection type
• Terminal screw
• Tightening torque
• Conductor cross-sections (min./max.), 1 or 2 conductors
- Solid
- Finely stranded without end sleeve
- Finely stranded with end sleeve
- Stranded
- AWG cables, solid or stranded
- Ribbon cable conductors
(number x width x thickness)
Connection type
• Terminal screw
• Tightening torque
• Conductor cross-section (min./max.)
- Finely stranded with cable lug
- Stranded with cable lug
- AWG cable, solid or stranded, with cable lug
- With connecting bar (max. width)
Connection type
Diameter of opening
1) For grounded networks, otherwise 600 V.
2) When connecting cable lugs according to DIN 46235, use the
3RT19 56-4EA1 terminal cover for conductor cross-sections from 95 mm
ensure phase spacing.
3) When connecting cable lugs according to DIN 46234 for conductor cross-
2
sections from 240 mm
as well as DIN 46235 for conductor cross-sections
2
from 185 mm
, use the 3RT19 66-4EA1 terminal cover to ensure phase spa-
cing.
22
Siemens · 2011
3RB20 56,
3RB21 53
S6
120 mm
V
1000
kV
8
imp
V
1000
No
Yes, 50/60 Hz ±5 %
A
50 ... 200
W
0.05
See Catalog LV 1, "Selection and ordering data"
See "Technical specifications" (short-circuit protection with fuses for motor feeders)
1)
V
690
Screw terminals with box terminal
4 mm Allen screw
Nm
10 ... 12
2
mm
--
2
mm
With 3RT19 55-4G box terminal:
2 × (1 × max. 50, 1 × max. 70),
1 × (10 ... 70)
With 3RT19 56-4G box terminal:
2 × (1 × max. 95, 1 × max. 120),
1 × (10 ... 120)
2
mm
With 3RT19 55-4G box terminal:
2 × (1 × max. 50, 1 × max. 70),
1 × (10 ... 70)
With 3RT19 56-4G box terminal:
2 × (1 × max. 95, 1 × max. 120),
1 × (10 ... 120)
2
mm
With 3RT19 55-4G box terminal:
2 × (max. 70),
1 × (16 ... 70)
With 3RT19 56-4G box terminal:
2 × (max. 120),
1 × (16 ... 120)
AWG With 3RT19 55-4G box terminal:
2 × (max. 1/0),
1 × (6 ... 2/0)
With 3RT19 56-4G box terminal:
2 × (max. 3/0),
1 × (6 ... 250 kcmil)
mm
With 3RT19 55-4G box terminal:
2 × (6 × 15.5 × 0.8),
1 × (3 × 9 × 0.8 ... 6 × 15.5 × 0.8)
With 3RT19 56-4G box terminal:
2 × (10 × 15.5 × 0.8),
1 × (3 × 9 × 0.8 ... 10 × 15.5 × 0.8)
Busbar connections
M 8 × 25
Nm
10 ... 14
2
mm
16 ... 95
2
mm
25 ... 120
AWG 4 ... 250 kcmil
mm
15
Straight-through transformers
mm
24.5
2)
2)
2
to
3RB20 66,
3RB21 63
S10/S12
145 mm
55 ... 250 to
160 ... 630
5 mm Allen screw
20 ... 22
2 × (50 ... 185),
Front clamping point only:
1 × (70 ... 240)
Rear clamping point only:
1 × (120 ... 185)
2 × (50 ... 185),
Front clamping point only:
1 × (70 ... 240)
Rear clamping point only:
1 × (120 ... 185)
2 × (70 ... 240),
Front clamping point only:
1 × (95 ... 300)
Rear clamping point only:
1 × (120 ... 240)
2 × (2/0 ... 500 kcmil),
Front clamping point only:
1 × (3/0 ... 600 kcmil)
Rear clamping point only:
1 × (250 kcmil ... 500 kcmil)
2 × (20 × 24 × 0.5),
1 × (6 × 9 × 0.8 ... 20 × 24 × 0.5)
M 10 × 30
14 ... 24
3)
50 ... 240
3)
70 ... 240
2/0 ... 500 kcmil
25
--
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