Semiconductor soft starter 3RW3 The following graphic shows the time ramp in the case of the 3RW3: U N U s t R1 t R2 Fig. 8-8: Time ramp, 3RW31 Accessories A fan can be snapped in from below in sizes S0 to S3 of the soft starter case, thus ensuring the following characteristics: Extended possibilities in relation to the installation position Increased switching frequency (see Chapter 8.3.2 "Assembly specifica- tions") In the case of sizes S0 and S2, terminal covers can be fitted onto the frame covers to cover up the cable ends for safety against finger touch.
These are identical with the terminal covers of the SIRIUS 3R contactors 3RT in the same sizes Connection covers for cable lug or rail connection are available for size S3. These are also identical with the accessories of the corresponding SIRIUS 3R contactor size. See Chapter 8.4 for details of further accessories. Assembly The units are fitted to the circuit-breaker 3RV by means of a connection module, and are thus linked mechanically and electrically. The connection module is identical with the one that is also used for the corresponding con- tactor and circuit-breaker combinations. This assembly variant offers all the advantages of a fuseless load feeder.
Connection modules The following connection modules are used for assembly of the soft starter 3RW3 and the circuit-breaker 3RV1: Tabelle 8-3: Connection modules, soft starter 3RW3 + circuit-breaker 3RV1 Connection The electronic soft starter 3RW3 are available from screw connection. Plus- minus POZIDRIV 2 screws are used. The SIGUT connection technique (captive screws, contacts open on delivery etc.) is applied. 8-12 Stand 08/99 U t Size Connection module S00 3RA1911-1A S0 3RA1921-1A S2 3RA1931-1A S3 3RA1941-1A