3RU11, 3RB10, and 3RB12 overload relays
SIRIUS System Manual
4-26
GWA 4NEB 430 0999-02b
4 3RU11, 3RB10, and 3RB12 overload relays
4.5 Mounting and connection
4.5.1 Mounting
3RU11/3RB10
The 3RU11 and 3RB10 overload relays can be attached directly to the 3RT
contactors and 3RW30/31 soft starters in the corresponding frame size.
In stand-alone installation they are suitable for being snapped onto a 35 mm
rail in acc. with DIN EN 50 022 or for screw-on mounting.
The overload relay in the frame size S3 is suitable for 35 mm and 75 mm
rails.
3RB12
70 mm width
The 3RB12 electronic overload relays are either snapped onto a
35 mm rail in acc. with DIN EN 50 022 or screwed onto a mounting plate by
means of push-in lugs, which are available as accessories.
The devices with current setting ranges < 100 A are designed for stand-
alone installation on account of the bar-type system of the primary current
lines.
120 mm/145 mm/230 mm width
In the case of the current setting ranges > 50 A to 820 A of the device
widths 120 mm, 145 mm, and 230 mm, the 3RB12 electronic overload
relays can be mounted directly onto the contactors by means of connecting
bars.
A screw-on attachment is integrated in the housing of these devices.
For the 3RB1253 devices (120 mm width) there is also a base plate available
for snap-on attachment to a 75 mm rail.
Mounting onto contac-
tors/soft starters
The following illustration shows how overload relays (in this case the 3RU11)
in frame size S00 are attached to the 3RT contactor and the 3RW30/31 soft
starter:
Figure 4-18: Mounting onto the 3RT contactor/3RW3 soft starter
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