Product description
3.1 Introduction
SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
18 Manual, 09/2016, A5E03656507420A/RS-AB/003
The overload relays are available with the following connection system options:
● Screw-type connection system
● Spring-loaded connection system (sizes S2 and S3 auxiliary circuit only)
● Ring cable lug connection technology (3RU21 only: main circuit and auxiliary circuit in
sizes S00 and S0; main circuit in size S3 only)
3RB3 (sizes S2 and S3) and 3RB2 (size S6) electronic overload relays are also available in
through-hole technology with straight-through transformer. As an alternative, 3RB20 / 3RB21
electronic overload relays in sizes S6 to S10 / S12 can be connected to the main circuit via
busbars.
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