The 861H is the first completely solid-state relay approved for use in hazardous locations. It is ideal for applications that demand frequent switching and reliability such as burner assemblies, chemical injections systems, extraction and refining machines, solenoid control, blower control, motorized duct and vent control, medical equipment and lighting in Class 1, Division 2 rated environments. Additional Details ------------------------------ Product description: The 861H is the first completely solid-state relay approved for use in hazardous locations. It is ideal for applications that demand frequent switching and reliability such as burner assemblies, chemical injections systems, extraction and refining machines, solenoid control, blower control, motorized duct and vent control, medical equipment and lighting in Class 1, Division 2 rated environments.