Data Sheet

— downwards
6mm
● for live parts
— forwards
0mm
— Backwards
0mm
— upwards
6mm
— downwards
6mm
— at the side
6mm
Connections/ Terminals
Product function
● removable terminal for auxiliary and control
circuit
No
Type of electrical connection
● for main current circuit
screw-type terminals
● for auxiliary and control current circuit
screw-type terminals
Arrangement of electrical connectors for main current
circuit
Top and bottom
Type of connectable conductor cross-sections
● for main contacts
— single or multi-stranded
2x (1 ... 2,5 mm²), 2x (2,5 ... 10 mm²)
— finely stranded with core end processing
2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²), 1x 10 mm²
● at AWG conductors for main contacts
2x (16 ... 12), 2x (14 ... 8)
Type of connectable conductor cross-sections
● for auxiliary contacts
— single or multi-stranded
2x (0,5 ... 1,5 mm²), 2x (0,75 ... 2,5 mm²)
— finely stranded with core end processing
2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
● at AWG conductors for auxiliary contacts
2x (20 ... 16), 2x (18 ... 14)
Tightening torque
● for main contacts with screw-type terminals
2...2.5N·m
● for auxiliary contacts with screw-type terminals
0.8...1.2N·m
Design of screwdriver shaft Diameter 5 ... 6 mm
Size of the screwdriver tip Pozidriv PZ 2
Design of the thread of the connection screw
● for main contacts
M4
● of the auxiliary and control contacts
M3
Safety related data
Failure rate [FIT]
● with low demand rate acc. to SN 31920
50FIT
MTTF with high demand rate 2280y
T1 value for proof test interval or service life acc. to
IEC 61508
20y
Display
3RU2126-4BB0 Subject to change without notice
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09/11/2019 © Copyright Siemens