Toshiba RC803A-HP1 Current Relay

The Toshiba RC803A-HP1 Current Relay monitors three-phase motor current and provides overcurrent and undercurrent protection for industrial motor systems. With an adjustable sensing range of 0.5–5 A (without CT) and a continuous rated current of 5 A, it can be wired via two Form C contacts (2NO/2NC) and powered from 100–120 VAC or 200–240 VAC at 50/60 Hz, with a maximum input circuit voltage of 600 VAC. Timing and environmental specs include a trip-time adjustment of 0.1–3 s (T2/T3), a start-up delay of 0.3–3 s (T1), operating temperature −10°C to +60°C, and 45–85% non-condensing humidity; common replacements are RC803A-HP2, HP3, and HP5, and it is widely used in MCCs, conveyors, pumps, compressors, fans, HVAC equipment, and factory automation by system integrators for motor protection and current monitoring.