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SIRIUS
Siemens Industry, Inc. Industrial Control Product Catalog 2017
3/25
3
OVERlOAd RElAYS
1) For version with straight-through transformer up to 1000 VAC.
2) For version with straight-through transformer up to 8 kV.
Type
3RB30 16,
3RB31 13
3RB30 26,
3RB31 23
3RB30 36,
3RB31 33
3RB30 46,
3RB31 43
Size S00 S0 S2 S3
Width 45 mm 45 mm 55 mm 70 mm
Main circuit
Rated insulation voltage U
i
(pollution degree 3)
V 690 690 1000
Rated impulse withstand voltage U
imp
kV 6 6 8
Rated operational voltage U
e
V 690 690 690 1000
Type of current
• Direct current No
• Alternating current Yes, 50/60 Hz ± 5%
Set current A 0.1 ... 0.4 to
4 ... 16
0.1 ... 0.4 to
10... 40
12.5 ... 50
and 20 to 80
12.5 ... 50 to
25 ... 100
Power loss per unit (max.) W 0.05 ... 0.2
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)
Protective separation between main and auxiliary
conducting path according to IEC 60947-1 (pollution degree 2)
V 690 for grounded networks, otherwise 600 V
Connection for main circuit
Electrical connection version Screw terminal Screw terminal Screw terminal Screw terminal
with box terminal /
Screw terminal
• Terminal screw M3, Pozidriv size 2 M3, Pozidriv size 2 M4, Pozidriv size 2
M8, 4 mm Allen screw
mNeuqrot gninethgiT• 0.8 ... 1.2 2 ... 2.5 2 ... 2.5 4 ... 6
• Conductor cross-sections (min./max.)
mmSolid or stranded-
2
2 × (0.5 ... 1.5)
3)
2 × (0.75 ... 2.5)
3)
2 × (1 ... 2.5)
3)
2 × (2.5 ... 10)
1 × (1 ... 50)
2 × (1 ... 35)
(Solid or Stranded)
2 × (2.5 ... 16)
mme (DIN 46228 T1)veels dne htiw dednarts yleniF-
2
2 × (0.5 ... 1.5)
3)
2 × (0.75 ... 2.5)
3)
2 × (1 ... 2.5)
3)
2 × (2.5 ... 6)
3)
2 × (1 ... 25),
1 × (1 ... 35)
2 × (2.5 ... 35),
1 × (2.5 ... 50)
mmdednartS-
2
-- 2 × (10 ... 50),
1 × (10 ... 70)
2 × (18 ... 2)
1 × (18 ... 1)
2 × (10 ... 1/0),
2 × (10 ... 2/0)
- Ribbon cable conductors
(number x width x circumference)
mm
AWG
-- 2 × (6 × 9 × 0.8)
Busbar connections
• Terminal screw -- M 6 × 20
mNeuqrot gninethgiT• -- 4 ... 6
• Conductor cross-section (min./max.)
mmgul elbac htiw dednarts yleniF-
2
-- 2 × 70
mmgul elbac htiw dednartS-
2
-- 3 × 70
- AWG connections, solid or stranded, with cable lug AWG -- 2/0
mm)htdiw .xam( rab gnitcennoc htiW- -- 12
Straight-through transformers
mmgninepo fo retemaiD• – 15 18
690
6/8
0.05
2 × (0.05 ... 4)
3)
max. 1 x 10
- AWG cables, solid or stranded
2 × (18 ... 14)
3)
2 × (14 ... 8)
3)
2 × (20 ... 16)
3)
2 × (16 ... 12)
3)
2 × 12
3) If two different conductor cross-sections are connected
to one clamping point, both cross-sections must lie in
the range specified.
Overload Relays
3RB2 / 3RB3 Solid-State Overload Relays
3RB20, 3RB21, 3RB30, 3RB31 up to 630A for standard applications