Data Sheet
— downwards
6mm
● for live parts
— forwards
0mm
— Backwards
0mm
— upwards
6mm
— downwards
6mm
— at the side
6mm
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...2.5N·m
● for auxiliary contacts with screw-type terminals
0.8...1.2N·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
50FIT
MTTF with high demand rate 2280y
T1 value for proof test interval or service life acc. to
IEC 61508
20y
Display
3RU2126-4BB0 Subject to change without notice
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09/11/2019 © Copyright Siemens