Virtual VRS52H-S-DC5V-C Relay plastic enclosed isolated switching step-down power supply module. It can supply 5V DC from  120V AC – 230V AC and has a power rating of 3 Watt. This makes it perfect for small projects that need a 5 volt supply from mains. There are many advantages for these relay, such as low-temperature rise, low power, high efficiency, high reliability, high-security isolation, etc. It is widely used in a smart home, automation and control, communication equipment, instrumentation, and other industries.