Relay boards facilitate monitoring of the UPS system and display the status on in the states ON/OFF, fault/operating, but do not provide any other options for displaying information. As a result, relay boards provide the simplest type of monitoring for UPS systems. The relay boards can be integrated as slot cards in UPS systems of the JOVYTEC P, L and PMS series. Relay boards as slot cards can be replaced alternatively by SNMP adapters if required. Relay boards can optionally be integrated permanently into the devices of the JOVYSTAR-E series.