This thermal controller offers some basic features with limited configuration options, it is for much less demanding application, despite it's cost-effective nature, still it offers Relay, SSR Drive and analog output, analog output being at the same price with the relay and SSR Drive output, maximum 2 alarms and heating+cooling control at the same time are possible, the alarm output can be used as a sub output to control a fan or valve in a system, TC/RTD and analog inputs compatible, 24VDC source and 85~265Vac source optional

REX C100, C400, C700, C900 is a very popular controller on the markets, comes with relay or SSR Drive output, with 1 alarm and works on wide range of power supply, works with thermocuple and RTD inputs despite the cost being very competetive.

CH102, CH402, CH702, CH902 is a very popular controller on the markets, comes with relay and SSR Drive output, relay and SSR Drive output at the same time, faciliated wiht different terminals, if you want to use the relay output, then connect your AC contractor or SSR with the relay output terminal, if you want to use SSR drive output, then connect your solid state relay with SSR Drive output terminal, with 1 alarm and works on wide range of power supply, works with thermocuple and RTD inputs despite the cost being very competetive.