The Circutor Computer SMART III 14 (code R13864) is a three-phase automatic power factor regulator that manages reactive energy compensation across 14 contactor-switched steps. It accepts an AC supply of 100…400 V at 50…60 Hz and communicates via RS-485 using the Modbus RTU protocol, making it a capable choice for both new installations and regulator replacements in industrial compensation panels.

Technical specifications:

• Model: Computer SMART III 14
• Circutor code: R13864
• EAN: 8433059227494
• Type: Three-phase power factor regulator
• Number of regulation steps: 14
• Switching unit: Contactor
• AC power supply: 100…400 V AC, 50…60 Hz
• Power consumption: 14…18 VA
• Voltage measurement range: 20…300 V Ph-N / 35…520 V Ph-Ph
• Nominal 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
• Phase current measuring range: 1…120% of nominal
• Minimum current measurement: 50 mA
• Serial communication: RS-485, Modbus RTU
• Digital relay outputs: 16 total (14 step outputs, 1 fan, 1 alarm relay)
• Relay output ratings: 1 A, 1 kV max open-contact voltage, 2500 VA max switching capacity
• Relay electrical life: 30 x 10^3 cycles; mechanical life: 5 x 10^6 cycles
• Digital transistor outputs: 2 x NPN, 50 mA, 24 V DC
• Digital inputs: 2, optoisolated, potential-free contact
• Leakage current measurement range: 0.01…1.5 A
• Active power measurement accuracy: 0.5% +/- 1 digit
• Reactive power measurement accuracy: 1% +/- 2 digits, Class 1
• Active energy accuracy: 0.5% +/- 2 digits
• Reactive energy accuracy: Class 1
• Phase current accuracy: 0.5% +/- 1 digit
• Installation category: CAT III 300 V
• Protection class: IP 51 (front panel) / IP 31 (unmounted)
• Dimensions (W x H x D): 144 x 144 x 71 mm
• Mounting: Panel
• Weight: 0.619 kg
• Operating temperature: -10…+55 C
• Storage temperature: -20…+70 C
• Relative humidity: 5…95% (non-condensing)
• Display: LCD custom COG
• Interface: Capacitive keyboard (5 keys), 4 LED indicators
• Maximum installation altitude: 2000 m
• Standards: IEC 61010, IEC 61000-6-2, IEC 61000-6-4, IEC 61557-12

Features and benefits:

• Supports measurement with either one or three current transformers, allowing the regulator to mirror the utility meter reading precisely and handle installations where phase currents are significantly unbalanced.
• Residual leakage current monitoring is available when used with compatible WG-series current transformers, adding an extra layer of safety supervision within the compensation panel.
• RS-485 Modbus RTU communication enables integration with SCADA systems, energy management platforms, or building automation networks for centralised monitoring.
• Up to four programmable cos phi target values can be set to match different tariff time periods, reducing manual intervention when consumption patterns change throughout the day.
• The wide AC supply range of 100…400 V and voltage measurement span up to 520 V Ph-Ph make the unit suitable for diverse grid conditions without requiring additional matching transformers.

Applications:

• Automatic reactive energy compensation in industrial plants, manufacturing facilities, and large commercial buildings to reduce reactive energy penalties.
• Retrofitting or upgrading the controller in existing capacitor banks where a drop-in regulator replacement is required.
• Installations with pronounced phase current imbalances where three-transformer measurement delivers greater compensation accuracy than a single-CT setup.
• Medium voltage compensation systems that require a regulator capable of operating across a broad voltage measurement range.

Also known as: Circutor Computer SMART III 14, Computer SMART III 14 R13864, R13864 power factor controller, Circutor reactive energy regulator, three-phase power factor regulator 14-step.