Features:1 The solid state relay is small and delicate with high reliability 2 The ratio depend on the kind of loading for your equipment Resistive load: 60%, inductive load: 30% 3 The cooling fan is necessary when the current is over 60A 4 As the generate heat of SSR is too high, SSR must be loaded on radiator when the current of load is over 10A And there are must put the thermal grease compound between SSR and radiator 5 You need choose the correct type (the current and the control modes) Also a suitable radiator(to dissipate heat of SSR) is improtant Description:This alternating current to alternating current solid state relay is designed with high precision, good performance and easy installation and use Specifications:Brand: SINOTIMERInput voltage: 80-250VACOutput voltage: 24-380VACControl type: Zero Cross TriggerResponse time: ON