Connection
8.1 Connection
SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
Manual, 09/2016, A5E03656507420A/RS-AB/003
101
Please observe the information in Chapter "Technical specifications (Page 147)" with regard
to touch protection for 3RU21 thermal overload relays and 3RB30 / 3RB31 electronic
overload relays (according to IEC 60529). Devices in sizes S00 and S0 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 or in the case of devices with busbar connection (sizes S6 to S10 / S12).
Note
3RU2 and 3RB3 devices (sizes
S2 and S3) have degree of protection IP00 in the area of the
main circuit connecting terminals.
3RB2 (size S6) and 3RB3 (sizes S2 and S3) devices with through
-hole connection
technology have degree of protection
IP20.
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