Siemens SIRIUS 3RF Series

SIRIUS 3RU2/3RB3 overload relays
5.10 Technical data
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
551
Type 3RB30 1.,
3RB31 1.
3RB30 2.,
3RB31 2.
Size S00 S0
Width 45 mm 45 mm
Ground-fault protection (3RB31 only) The information refers to sinusoidal fault currents at 50/60 Hz
 Tripping value I
Δ
> 0.75 x I
motor
 Operating range I
Lower current setting < I
motor
< 3.5 x upper current setting
 Response time t
trip
(in steady-state
condition)
s < 1
Integrated electrical remote reset (3RB31 only)
Connection terminals A3, A4
24 V DC, max. 20 mA for approx. 20 ms, thereafter < 10 mA
Protective separation between auxiliary
current paths
acc. to IEC/EN 60947-1
V 300
CSA, UL, and UR rated data
Auxiliary circuit – Switching capacity 3RB30: B600, R300; 3RB31: B300, R300
5.10.3.5 Conductor cross sections, auxiliary circuit
Table 5- 47 Technical data for the main circuit connection, 3RB30/3RB31 overload relays
Type 3RB30 1.,
3RB31 1.
3RB30 2.
3RB31 2.
Size S00 S0
Width 45 mm 45 mm
Connection type Screw connection
 Connection screw
Pozidriv, size 2
 Operating tool
∅ 5 to 6
 Tightening torque
Nm 0.8 to 1.2
 Conductor cross-sections (min./max.), 1-wire or 2-wire
- Solid mm
2
1 x (0.5 to 4); 2 x (0.5 to 1.5)
- Finely stranded with end
sleeve
mm
2
1 x (0.5 to 2.5); 2 x (0.5 to 1.5)
- AWG cables, solid or stranded AWG 2 x (20 to 14)
Connection type Spring-loaded connection
 Operating tool
∅ 3.0 x 0.5
 Conductor cross-sections (min./max.), 1-wire or 2-wire connection possible
- Solid mm
2
2 x (0.25 to 1.5)
- Finely stranded with end
sleeve
mm
2
2 x (0.25 to 1.5)
- Stranded mm
2
2 x (0.25 to 1.5)
- AWG cables, solid or stranded AWG 2 x (24 to 16)