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SIRIUS
Siemens Industry, Inc. Industrial Control Product Catalog 2017
3/26
3
OVERlOAd
RElAYS
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
2
to ensure phase spacing.
3) When connecting cable lugs according to DIN 46234 for conductor cross-
sections from 240 mm
2
as well as DIN 46235 for conductor cross-sections
from 185 mm
2
, use the 3RT19 56-4EA1 terminal cover to ensure phase
spacing.
Type 3RB20 56,
3RB21 53
3RB20 66,
3RB21 63
Size
S6 S10/S12
Width
120 mm 145 mm
Main circuit
Rated insulation voltage U
i
(pollution degree 3) V 1000
Rated impulse withstand voltage U
imp
kV 8
Rated operational voltage U
e
V 1000
Type of current
• Direct current No
• Alternating current
Yes, 50/60 Hz
±
5 (other frequencies on request)
Set current A
50 ... 200 55 ... 250 to
160 ... 630
Power loss per unit (max.) W
0.05
Short-circuit protection
- With fuse without contactor See Selection and Ordering Data
- With fuse and contactor
See Technical Specifications (short-circuit protection with fuses for motor feeders)
Safe isolation between main
and auxiliary conducting path according to IEC 60947-1
V
690
1)
Connection for main circuit
Electrical connection version Screw terminal with box terminal/
Bus connection /
Straight-through transformer
Screw terminal
with box terminal/
Bus connection
Screw terminal
• Terminal screw 4 mm Allen screw 5 mm Allen screw
mNeuqrot gninethgiT•
10 ... 12 20 ... 22
• Conductor cross-sections (min./max.), 1 or 2 conductors
mmdiloS-
2
--
- Finely stranded without end sleeve mm
2
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 × (50 ... 185),
front clamping point only:
1 × (70 ... 240)
rear clamping point only:
1 × (120 ... 185)
mmeveels dne htiw dednarts yleniF-
2
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 × (50 ... 185),
front clamping point only:
1 × (70 ... 240)
rear clamping point only:
1 × (120 ... 185)
mmdednartS-
2
With 3RT19 55-4G box terminal:
2 × (max. 70),
1 × (16 ... 70)
With 3RT19 56-4G 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 conductors, solid or stranded 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)
2 × (2/0 ... 500 kcmil),
front clamping point only:
1 × (3/0 ... 600 kcmil)
rear clamping point only:
1 × (250 kcmil ... 500 kcmil)
- Ribbon cable conductors
(number x width x circumference)
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)
2 × (20 × 24 × 0.5),
1 × (6 × 9 × 0.8 ... 20 × 24 × 0.5)
Busbar connections
• Terminal screw M 8 × 25 M 10 × 30
mNeuqrot gninethgiT•
10 ... 14 14 ... 24
• Conductor cross-section (min./max.)
mmgul elbac htiw dednarts yleniF-
2
16 ... 95
2)
50 ... 240
3)
mmgul elbac htiw dednartS-
2
25 ... 120
2)
70 ... 240
3)
- AWG connections, solid or stranded, with cable lug AWG 4 ... 250 kcmil 2/0 ... 500 kcmil
mm)htdiw .xam( rab gnitcennoc htiW-
15 25
Straight-through transformers
mmgninepo fo retemaiD• 24.5 --
• Conductor cross-section (max.)
mmYYN-
2
120 --
mmF-NR70H-
2
70 --
Overload Relays
3RB2 /3RB3 Solid-State Overload Relays
3RB20, 3RB21, 3RB30, 3RB31 up to 630A for standard applications