Applications

Example: Plastics processing industry

Thanks to their high switching endurance SIRIUS 3RF2 solid-state switching devices are ideal for controlling electrical heat. This is because the more precise the temperature regulation process required, the higher the switching frequency. The accurate regulation of electrical heat is used for example in many processes in the plastics processing industry:

• strip-type heaters heat the extrudate to the correct temperature in plastic extruders
• Heat emitters warm plastic blanks to the correct temperature
• Heat drums dry plastic granules
• Heating channels keep molds at the correct temperature for the error-free manufacture of a range of plastic parts.

The powerful SIRIUS 3SF2 solid-state relays and contactors can be used for the simultaneous control of several heating loads. A load monitoring module enables easy monitoring of individual partial loads and, in the event of a failure, generates a signal that is sent to the controller.

Use in fuseless load feeders

Compared with the fused configuration of load feeders, short circuit and line protection using miniature circuit breakers is easy to achieve with SIRIUS 3SF2 solid-state relays and contactors.

A special version of the solid-state contactors can be protected against short circuit using a miniature circuit breaker with tripping characteristic B. This allows the low-cost and simple configuration of fuseless load feeders with full protection of the switchgear.