The Schneider Electric RTC48PUN1SRHU Temperature Control Relay RTC - 48x48 mm - 100..240 V AC - 1 SSR, 1 Relay, Alarm is a modular temperature control relay that is perfect for a variety of applications. The relay features a 100 to 240 V AC input voltage and can be used to control a variety of loads, including SSRs, relays, and alarms.