Circutor Computer SMART III 12 (code R13862) is a three-phase power factor regulator that controls 12 capacitor bank steps via contactors. Designed for installations with demanding compensation requirements, it operates across a power supply range of 100 to 520 V AC, communicates over RS-485 using Modbus RTU, and uniquely accepts either one or three current transformers for precise reactive energy regulation alongside integral power analysis and residual leakage current monitoring.

Technical specifications:

• Model: Computer SMART III 12
• Circutor code: R13862
• EAN: 8433059175115
• Number of steps: 12
• Switching unit: Contactor
• Power supply: 100…520 V AC, 50…60 Hz
• Consumption: 13…20 VA
• Installation category: CAT III 300 V
• Voltage measurement range: 20…300 V Ph-N, 35…520 V Ph-Ph
• Nominal measurement voltage: 230 V Ph-N, 400 V Ph-Ph
• Minimum measurement voltage: 20 V Ph-N, 35 V Ph-Ph
• Input current: …/5 A or …/1 A secondary
• Phase current measuring range: 1…120% of In
• Minimum current measurement: 50 mA
• Leakage current measurement range: 0.01…1.5 A
• Serial communication: Modbus RTU, RS-485
• Digital relay outputs: 14 total (12 step outputs, 1 fan, 1 alarm relay)
• Maximum relay current: 1 A
• Maximum relay switching capacity: 2500 VA
• Relay electrical life: 30 x 10 cycles
• Relay mechanical life: 5 x 10 cycles
• Digital transistor outputs: 2 x NPN, 50 mA, 24 V DC
• Digital inputs: 2, optoisolated, potential-free contact
• Active power measurement accuracy: 0.5% 1 digit
• Reactive energy accuracy: Class 1
• Active energy accuracy: 0.5% 2 digits
• Phase current accuracy: 0.5% 1 digit
• Display: Custom COG LCD with capacitive 5-key keyboard and 4 LEDs
• Size: 144 144 71 mm, panel mount
• Enclosure: Plastic V0 self-extinguishing
• Protection class: IP 51 front panel, IP 31 unmounted
• Working temperature: -10…+55 C
• Storage temperature: -20…+70 C
• Relative humidity: 5…95% non-condensing
• Maximum altitude: 2000 m
• Weight: 0.6 kg
• Standards: IEC 61010, IEC 61000-6-2, IEC 61000-6-4, IEC 61557-12

Features and benefits:

• Accepts one or three current transformers, enabling the regulator to mirror the utility meter’s measurement method and deliver accurate compensation in unbalanced three-phase installations.
• Functions as an integral power analyzer, measuring active and reactive power and energy without requiring a separate instrument.
• Residual leakage current monitoring via compatible WG series current transformers provides early detection of insulation degradation as part of preventive maintenance.
• Programmable alarms combined with capacitor status testing allow continuous supervision of the compensation unit, helping to identify faults before they result in reactive energy penalties.
• Supports up to four target cos phi values across different time periods, making it adaptable to sites with variable consumption patterns or multi-tariff contracts.

Applications:

• Reactive power compensation in industrial and commercial capacitor banks requiring 12-step contactor switching control.
• Installations with significant load imbalances where a single current transformer cannot provide sufficiently accurate measurement across all three phases.
• Sites requiring combined power factor correction and power analysis within a single panel-mounted device.
• Medium voltage compensation units, where the wide 100 to 520 V AC supply range accommodates diverse transformer secondary voltages.

Also known as: Circutor Computer SMART III 12, Computer SMART III 12 R13862, R13862 power factor regulator, 12-step reactive energy regulator, three-phase power factor controller.