Toshiba RC803A-HP1 Current Relay

Description:

The Toshiba RC803A-HP1 Current Relay is used in industrial motor control systems to monitor motor current and provide overcurrent and undercurrent protection for three-phase AC motors. Commonly installed in motor control centers (MCCs), conveyor systems, pumps, compressors, fans, HVAC equipment, mixers, and manufacturing machinery requiring adjustable motor current sensing with 120/240 VAC control power. Maintenance teams, OEMs, and system integrators use this relay for replacement of failed current relays, motor protection upgrades, preventive maintenance, and control panel retrofits.

Applications:

The Toshiba RC803A-HP1 is widely used in industrial motor starters, conveyor systems, pumping stations, HVAC equipment, crushers, mixers, air compressors, water and wastewater treatment plants, and factory automation systems where overcurrent and undercurrent monitoring helps protect motors from overloads, dry-running conditions, belt failures, and mechanical jams.

Technical Specifications:

• Manufacturer Part Number (MPN): RC803A-HP1
• Brand: Toshiba
• Product Type: Current Relay
• Series: RC803A
• Protection Functions: Overcurrent and Undercurrent
• Rated Current: 5 A Continuous
• Adjustable Current Range: 0.5–5 A (Without CT)
• Rated Control Voltage: 100–120 VAC / 200–240 VAC, 50/60 Hz
• Maximum Input Circuit Voltage: 600 VAC, 50/60 Hz
• Trip Time Adjustment: 0.1–3 Seconds (T2, T3)
• Start-Up Delay: 0.3–3 Seconds (T1)
• Output Contacts: 2 Form C (2NO/2NC)
• Contact Rating: 250 VAC, 5 A Resistive
• Operating Temperature: -10°C to +60°C
• Relative Humidity: 45–85% (Non-Condensing)
• Application: Three-Phase Motor Protection and Current Monitoring

Common Replacements:

• Toshiba RC803A-HP2
• Toshiba RC803A-HP3
• Toshiba RC803A-HP5