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Type
Size
Width
Auxiliary circuit
Number of NO contacts
Number of NC contacts
Auxiliary contacts – assignment
Rated insulation voltage U
i
(degree of pollution 3)
Rated impulse withstand voltage U
Auxiliary contacts – contact rating
• NC contact with alternating current AC-14/AC-15
I
Rated operational current
at U
e
e
- 24 V
- 120 V
- 125 V
- 250 V
• NO contact with alternating current AC-14/AC-15:
I
Rated operational current
at U
e
e
- 24 V
- 120 V
- 125 V
- 250 V
• NC, NO contact with direct current DC-13:
I
Rated operational current
at U
e
e
- 24 V
- 60 V
- 110 V
- 125 V
- 250 V
I
• Conventional thermal current
th
• Contact reliability
(suitability for PLC control; 17 V, 5 mA)
Short-circuit protection
• With fuse, gL/gG operational class
Ground-fault protection (only 3RB21)
I
• Tripping value
Δ
I
• Operating range
• Response time t
(in steady-state condition)
trip
Integrated electrical remote reset (only 3RB21)
Connecting terminals A3, A4
Protective separation between main and auxiliary con-
ducting path acc. to IEC 60947-1
CSA, UL, UR rated data
Auxiliary circuit – switching capacity
Connection of the auxiliary 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
Connection type
• 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
Footnotes for page 24:
1) Please observe operational voltage.
2) Type of coordination and short-circuit protective devices acc. to IEC 60947-4-1:
Type of coordination "1": The contactor or the starter may be non-opera-
tional after every short-circuit release.
Type of coordination "2": The contactor or the starter must be operatio-
nal after a release (without replacement of parts). There is a risk of contact
welding.
3RB20 16,
3RB21 13
S00
45 mm
1
1
1 NO for the signal "tripped",
1 NC for disconnecting the contactor
V
300
kV
4
imp
:
A
4
A
4
A
4
A
3
:
A
4
A
4
A
4
A
3
:
A
2
A
0.55
A
0.3
A
0.3
A
0.11
A
5
Yes
A
6
The information refers to sinusoidal residual currents at 50/60 Hz
> 0.75 ×
Lower current setting value <
s
< 1
24 V DC, 100 mA, 2.4 W short-term
V
300
B300, R300
Pozidriv size 2
Nm
0.8 ... 1.2
2
mm
1 × (0.5 ... 4), 2 × (0.5 ... 2.5)
2
mm
–
2
mm
1 × (0.5 ... 2.5), 2 × (0.5 ... 1.5)
2
mm
–
AWG 2 × (20 ... 14)
2
mm
2 × (0.25 ... 1.5)
2
mm
--
2
mm
2 × (0.25 ... 1.5)
2
mm
2 × (0.25 ... 1.5)
AWG 2 × (24 ... 16)
3RB2 Solid-State Overload Relays
3RB20, 3RB21 for standard applications
3RB20 26,
3RB20 36,
3RB21 23
3RB21 33
S0
S2
45 mm
55 mm
I
motor
I
< 3.5 × upper current setting value
motor
Screw terminals
Spring-type terminals
3) U
= 500 V.
e
4) Contactor cannot be mounted.
5) Please ensure that the maximum AC-3 operational current has sufficient
safety clearance from the rated current of the fuses.
6) With 3UF18 68-3GA00 current transformer.
Overload Relays
3RB20 46,
3RB20 56,
3RB20 66,
3RB21 43
3RB21 53
3RB21 63
S3
S6
S10/S12
70 mm
120 mm
145 mm
Siemens · 2011
23
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