Elco Semi Contactor Power Controllers are a type of static group, to provide accurate process temperature control. SSRSPC1 Elco Semi Contactor Analogue Controllers are highly durable, ideal for heavy use. Solving switching & control tasks in specific devices. KEY FEATURES • AC Power Controller • IP20 Protection • Control Voltage: 230-480 VAC Elco SSRSC1 & RC1 AC Semi Contactors offer phase angle or burst firing control of heaters.