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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 version with straight-through transformer up to 1000 V AC.
2) For version with straight-through transformer up to 8 kV.
3) For grounded networks, otherwise 600 V.
4) If two different conductor cross-sections are connected to one clamping
point, both cross-sections must lie in the range specified. If identical
cross-sections are used, this restriction does not apply.
3RB20 16,
3RB21 13
S00
45 mm
V
690
kV
6
imp
V
690
No
Yes, 50/60 Hz ±5 %
A
0.1 ... 0.4 to
3 ... 12
W
0.05
See Catalog LV 1, "Selection and ordering data"
See "Technical specifications" (short-circuit protection with fuses for motor feeders)
3)
V
690
Screw terminals with box terminal
Pozidriv size 2
Nm
0.8 ... 1.2
2
mm
2 × (0.5 ... 1.5)
2 × (0.75 ... 2.5)
2
mm
--
2
mm
2 × (0.5 ... 1.5)
2 × (0.75 ... 2.5)
2
mm
--
AWG 2 × (18 ... 14)
mm
--
Busbar connections
--
Nm
--
2
mm
--
2
mm
--
AWG --
mm
--
Straight-through transformers
mm
--
Overload Relays
3RB2 Solid-State Overload Relays
3RB20, 3RB21 for standard applications
3RB20 26,
3RB20 36,
3RB21 23
3RB21 33
S0
S2
45 mm
55 mm
690/1000
2)
6/8
690/1000
0.1 ... 0.4 to
6 ... 25 and
6 ... 25
12.5 ... 50
2 ... 2.5
3 ... 4.5
4)
4)
,
2 × (1 ... 2.5)
,
2 × (1 ... 16)
4)
4)
2 × (2.5 ... 6)
4)
4)
,
2 × (1 ... 2.5)
,
2 × (1 ... 16)
4)
4)
2 × (2.5 ... 6)
1 × ( 1 ... 25)
2 × (max. 25),
1 × (1 ... 35)
2 × (14 ... 10)
2 × (max. 4),
1 × (18 ... 2)
2 × (6 × 9 × 0.8)
15
3RB20 46,
3RB21 43
S3
70 mm
1)
1000
8
1)
1000
12.5 ... 50 and
25 ... 100
Allen screw 4 mm
4 ... 6
2 × (2.5 ... 16)
4)
,
2 × (2.5 ... 35),
4)
1 × (2.5 ... 50)
2 × (10 ... 50),
1 × (10 ... 70)
2 × (10 ... 1/0),
1 × (10 ... 2/0)
2 × (6 × 9 × 0.8)
M 6 × 20
4 ... 6
2 × 70
3 × 70
2/0
12
18
Siemens · 2011
21
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