Siemens SIRIUS 3RF Series

SIRIUS 3RU2/3RB3 overload relays
5.10 Technical data
SIRIUS Innovations
542 System Manual, 01/2011, A8E56203870002-03
Type 3RU21 16 3RU21 26
Size S00 S0
Width 45 mm 45 mm
Connection type Ring cable lug connection
Connection screw M3, Pozidriv size 2 M4, Pozidriv size 2
Operating tool mm ∅ 5 to 6 ∅ 5 ... 6
Specified tightening torque Nm 0.8 to 1.2 2 to 2.5
Usable ring cable lugs mm
 DIN 46234 without insulating sleeve
 DIN 46225 without insulating sleeve
 DIN 46237 with insulating sleeve
 JIS C2805 type R without insulating sleeve
 JIS C2805 type RAV with insulating sleeve
 JIS C2805 type RAP with insulating sleeve
d
2
2)
= min. 3.2,
d
3
2)
= max. 7.5
d
2
2)
= min. 4.3,
d
3
2)
= max. 12.2
1)
If two different conductor cross-sections are being connected to one clamping point, both cross-sections must be
located in the range indicated. If identical cross-sections are used, this restriction does not apply.
2)
d
2
d
3