Toshiba Model RC803 Overcurrent/Undercurrent Electronic Relay
Toshiba Updated: 2007-07-18The RC803A Current Relay is designed to control and protect processes and equipment by monitoring the current of an induction mortor or other similar loads.
Applications:
• Conveyers: Protect against jams and excessive loads. Indicates broken or loose belts.
• Pumps: Protect against dry running, clogging, and worn bearings.
• Fans: Monitor fans for worn or broken belts. Indicates closed dampers or blocked belts.
• Chippers & Saws: Indicate dull or damaged cutting blades and teeth. Features
• Overcurrrent and undercurrent adjustable trip points.
• Adjustable start-up delay.
• Fail safe construction-relay operates as soon as the input current exceeds the preset level or power supply is de-energized.
• Individual SPDT (1NO/NC) output contact for overcurrent and undercurrent trip.
• Separate LED indication for overcurrent and undercurrent trip
• Small and compact size
RC803A - Overcurrent /Undercurrent
Type of current sensing Overcurrent/Undercurrent
Rated current Adjustable range 5A Max . Continuous 0.5-5A
Accuracy 10%
Reset hysteresis 10%
Temperature error (±30?C) ± 5%
Supply voltage 100 ~ 120V AC 200 ~ 240V AC
Frequency (± 10%) 50/60Hz
Start up delay, adjustable 0 (inst.)-30 sec.
Response delay, adjustable 0 (inst.)-3 sec.
Ambient temperature -10-+50?C
Power consumption 3.5VA
Current transformer burden 0.1VA
Output contact arrangement Overcurrent; SPDT (1 NO-NC)
Undercurrent; SPDT (1 NO-NC)
Output contact rating* Volt. Continuous Current Breaking Current
120V AC 5A 5A (Inductive, pf =0.4)
240V AC 5A 3A (Inductive, pf=0.4)
24V DC 5A 0.3A (L/R =15 ms)
120V DC 5A 0.15A (L/R = 15 ms)
240V DC 5A 0.1 A (L/R = 15 ms)
Dielectric withstand voltage between terminals and ground 2000V AC-1 min.
Weight 0.75kg (1 .7 lbs.)
RC803A Manual
RC803A Brochure
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