Weidmuller power solid-state relays

Electrical connectivity supplier Weidmuller has released its latest range of power solid-state relays (PSSRs). The electronic PSSRs deliver an unrestricted service life because they are wear-free.

The units have no mechanical contacts which can be worn away by arcs and sparks, ensuring their longevity. The devices are also shock- and vibration-resistant. Silent, they cause no disturbances and deliver good performance.

The single-phase models offer fast response times and are said to be quicker than a mechanical switch. They also feature a large switching capacity - from 24 to 510 VAC - and monitor high AC loads.

The optional, plug-on monitoring module warns users when current drops by 16% or more. It detects short circuits, line-breaks and defective loads to help deliver peace of mind. The PSSR variant with a 35 A load current features a high l²t load-current characteristic of 6000 A²S and can be used for line protection with standard circuit breakers. Further, the 70 A phase control unit with analog input (4-20 mA) allows users to set up heating controls or the power control of single-phase motors.

Robust and easy to use, the tall and lean PSSR modules are available both with and without a heatsink and can be installed directly where needed at the site of application. With a choice of eight devices customised to meet a multitude of diverse requirements, the units are suitable for use in the process industry, railway applications and machine and plant manufacturing.

Capable of handling demanding tasks, the units can be used in trace heating, phase-fired controllers for motors, infrared heaters and permanent current monitoring.