Siemens SIRIUS 3RU2 Manual page 20

Product description
3.1 Introduction
System integration
The overload relays have been matched to the contactors in the 3RT2 series both electrically
and mechanically and can be integrated in the feeder by means of direct mounting.
3RU2 thermal overload relays and 3RB30 and 3RB31 solid-state overload relays are
available in three sizes, S00, S0 and S2.
Connection systems
The overload relays are available with the following connection system options:
● Screw-type connection system
● Spring-loaded connection system (size S2 auxiliary circuit only)
● Ring cable lug connection technology (3RU21 only, in size S00 and S0)
3RB3 solid-state overload relays are available in size S2 also in through-hole technology
with straight-through transformer.
Accessories
The accessories have been tailored to the overload relays; they can be mounted easily and
without the need for tools.
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SIRIUS Innovations - SIRIUS 3RU2 thermal overload relays / SIRIUS 3RB3 solid-state overload relays
Manual, 09/2014, A5E03656507420A/RS-AA/002