Contacts last longer with SART. To allow radio modules with miniaturised relays to be operated safely, reliably and for a long time at high switching loads (230 V, 16 A), they come with optional SART technology (Smart Adaptive Relay Triggering).
The main purpose of SART technology is for switching relay contacts on and off at zero current. With ohmic loads this is very simple, because the voltage zero crossing is usually available for activation. With phase-shifted loads, however, it may be highly counterproductive because long, high-energy arcs may be produced that may seriously damage the relay contacts or make the relay and therefore the whole product unusable.
Relay contacts without SART technology on mockup of PC mains adapter, defective / burned out after less than 500 switching cycles (random switching point) with clearly seen arc on oscillogram of current profile
Relay contacts with SART technology on mockup of PC mains adapter, after far in excess of 12 000 switching cycles (microcontroller-controlled switching point) with oscillogram