Power Solid-State Relays

Weidmüller’s new Power Solid-State Relays (PSSR) are available as single- and three-phase versions. In comparison with contactors and standard relays PSSRs switch without any wear and are totally silent. The modules have a high peak load rating and as such have sufficient reserves to trip line-side fuses. They can easily cope with capacitive and inductive current spikes.

With integrated zero-voltage switching, single-phase PSSRs are eminently suitable for switching resistive loads up to 20 A in 55 °C heat. Example applications: pulsing cartridge heaters in injection molding machines manufacturing plastic components or switching infrared emitters in hardening plants or sewage works. These modules are distinguished by a low zero-voltage switching range. Three-phase PSSRs are designed with instantaneous switching functionality and are suitable for use in motor controls deployed in mechanical and systems engineering applications. Both PSSR 1PH and PSSR 3PH versions are ‘ready-to-use’; that means users simply snap them onto the mounting rail and connect them. In other words, the modules do have to be laboriously mounted onto a mounting plate or the wall of an electrical cabinet.

Single-phase Power Solid-State Relays are used to pulse cartridge heaters in injection molding machines.

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