Download  Print this page

Current Range 50 A To 820 A; Auxiliary Conductor Connection; Connection Scheme; Thermistor Sensor - Siemens 3RB12 Instructions Manual

Solid-state overload relay
Hide thumbs

Advertisement

Connection
3.1.2

Current range 50 A to 820 A

Finely stranded
conductor with
cable lug
2
[mm
]
3RB1253
35 to 95
3RB1257
50 to 240
3RB1262
50 to 240
3.2

Auxiliary conductor connection

Solid
Finely stranded with/
without end sleeve
2
[mm
]
[mm
1x(0.5 to 4)
1x(0.5 to 2.5)
2x(0.5 to 2.5)
2x(0.5 to 1.5)
Thermistor
sensor
3.3

Connection scheme

14
Busbar connection: see graphics section, Fig. II
Stranded con-
ductor with
cable lug
2
[mm
]
50 to 120
70 to 240
185 to 240
AWG
2
]
20 to 14 0.8x4...5.5
A link (A) is in place when the device is delivered. This
link must be removed when the sensor is connected
(see illustration in Fig. V and VI).
See graphics section of Fig. IV for circuit diagram,
showing Automatic resets and remote resets.
Facility for connecting summation current transformer
3UL22 for external earth fault monitoring.
Connection
Tightening
screws
torque
[Nm/lb.in]
M8
10 to 14 /
89 to 24
M10
14 to 24 /
124 to 210
M 10
14 to 24 /
(Connec-
124 to 210
tion to con-
tactor
3TF68)
M 12 (Con-
20 to 35 /
nection to
177 to 310
contactor
3TF69)
Connecting screws
[mm]
Pozidriv 2
3ZX1012-0RB12-1AA1
Tag
termination
[mm x mm]
20 x 4
30 x 6
40 x 8
Tightening torque
[Nm/lb.in]
0.8 to 1.2/
7 to 11

Hide quick links:

Advertisement

loading

  Related Manuals for Siemens 3RB12