Circutor computer SMART III 14 Power Factor Controller

A 14-step power factor controller that reads one or three current transformers

The Circutor computer SMART III 14 (code R13864) is a three-phase power factor regulator with 14 contactor outputs. Circutor describes the Computer SMART III as the only regulator on the market that can use three measurement transformers as well as the conventional single transformer, which gives an analogue reading of the company meter, and it also works as an integral power analyzer.

The datasheet adds leakage current control with WG series current transformers, programmable alarms and capacitor-status tests for preventive maintenance, up to four objective cos phi targets for different time periods, and use with medium-voltage compensation units. Switching is by contactor.

computer SMART III 14 functions

• 14 relay steps plus fan and alarm outputs (16 relay outputs in total)
• Measurement with 1 or 3 current transformers; input current …/5 A or …/1 A
• Integral power analyzer functions; Modbus RTU over RS-485
• Leakage current (residual) measurement, 0.01 to 1.5 A, with 3 mA secondary
• Two opto-isolated digital inputs and two NPN transistor outputs
• Up to four objective cos phi settings; alarm programming and capacitor test
• Supply 100 to 400 Vac; 144 x 144 mm panel format with 5-key capacitive keyboard

computer SMART III 14 technical specifications

Identification and supply

Measurement

Inputs, outputs and interface

Mechanical and environmental

Which SMART III model?

The SMART III contactor family is offered in three sizes on one datasheet: 6 steps (R13851.), 12 steps (R13862.) and 14 steps (R13864.), all …/5 A or …/1 A. Note that the 14-step model has a supply range of 100 to 400 Vac, whereas the 6 and 12 step models are listed at 100 to 520 Vac. For installations with fast-changing loads, Circutor lists the SMART III Fast regulators instead, which switch static elements. Confirm the number of capacitor steps in the bank and the CT ratio before ordering.

Installation and operation notes

Fit the regulator into a 144 x 144 mm panel cut-out, keeping within the IP51 front-panel rating and -10 to 55 C working range. Choose between one-CT and three-CT measurement during setup: the three-transformer method suits unbalanced systems, and the datasheet recommends moving from one to three CTs after a change in penalties, consumption habits or imbalance. Use WG-series transformers if leakage current monitoring is wanted, and connect RS-485 for supervisory access.

Where the SMART III 14 is used

Typical uses are automatic capacitor banks for plants billed on reactive energy: factories, workshops, malls and pumping stations. A 14-step regulator gives finer correction than a 6-step unit on large loads. Respect the printed 55 C working limit by mounting it in a ventilated panel.

Selection and installation notes

Before ordering a power factor regulator, collect the data the sizing depends on: the supply voltage and frequency, the current transformer ratio and where the transformer is fitted, the number and size of the capacitor steps, the contactor or static switch type and whether harmonics are present on the network. Fit the current transformer upstream of both the load and the capacitor bank so that the regulator sees the net current, connect it with the polarity shown in the manual and let the regulator run its automatic set-up before the first start. Check the alarm and relay settings and write the final values on the commissioning record so that later service work starts from a known state.

Information needed for a quotation

Send the full model code, the quantity, the delivery location in Oman or the GCC, the intended use and any accessories needed, so that the complete package can be quoted together.

Documents and supply information

The manufacturer data sheet is attached to this page and should be read together with the project specification and the site risk assessment before a purchase is confirmed. Ratings, standards and dimensions are quoted as printed on that sheet. Lead time, stock position and certificates available with the shipment are confirmed in the quotation, and we supply to Oman and the wider GCC region for industrial, utility and building services projects.

Related Circutor items

The same datasheet lists the computer SMART III 6 (R13851.) and 12 (R13862.). The SMART III Fast regulators (R13951., R13953., R13962., R13964.) are for static switching, and the OPTIM SVGm hybrid compensators and LRZ/LRBZ detuning reactors are listed on this site as separate items.

Frequently asked questions

How many steps does the SMART III 14 control?

14 contactor-driven steps, plus fan and alarm relays.

Can it measure with three current transformers?

Yes. It can use 1 or 3 current transformers, input …/5 A or …/1 A.

Does it monitor leakage current?

Yes, with WG series current transformers; range 0.01 to 1.5 A.

Which communication does it have?

RS-485 with Modbus RTU.

Is Seven Star LLC a distributor of Circutor?

No. We are an independent supplier based in Muscat, and we source genuine Circutor products for customers in Oman and the GCC when requested.

Documents and quotation

To request a quote, send the full model or order code, any options and the quantity. The reference document, the computer SMART III 14 datasheet (generated 21/10/2026), is attached to this page; please check the style code against it and the manual. Seven Star LLC is an independent supplier based in Muscat and ships Circutor products around the GCC on enquiry. Prices are quoted individually, and specifications should be confirmed with current manufacturer data. Browse Electrical & Power or the Circutor brand page.