SIRIUS Innovations - SIRIUS 3RU2 thermal overload relays / SIRIUS 3RB3 solid-state overload relays
Manual, 09/2014, A5E03656507420A/RS-AA/002
65
Connection
Connection types
The overload relays are available with the following connection types for the main and
auxiliary current paths:
● Screw-type connection system
● Spring-loaded connection system (size S2 auxiliary circuit only)
● Ring cable lug connection system (3RU21 only for size S00 and S0) with optional
terminal covers (accessories)
3RB3 solid-state overload relays are available in size S2 also in through-hole technology
with straight-through transformer.
The conductor cross-sections of the devices in the SIRIUS modular system are matched to
one another on a size-specific basis.
Coil repeat and auxiliary switch repeat terminal
In the case of size S00 3RU21 thermal overload relays and 3RB30/3RB31 solid-state
overload relays, direct contactor mounting involves feed-through of the auxiliary switch and
coil terminals A2 on the contactor. This makes wiring much easier.
Please observe the information in the chapter titled "Technical specifications (Page 101)"
with regard to touch protection for 3RU21 thermal overload relays and 3RB30/3RB31 solid-
state overload relays (according to IEC 61140). Devices with screw-type and spring-loaded
connection systems are finger-safe. The addition of terminal covers (accessories) is required
to achieve finger-safety in the case of ring cable lug connection systems.
Size S2 devices have degree of protection IP00 in the area of the main circuit connecting
terminals.
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