Circutor CIRWATT B410T 410-QT5A-90B10 Energy Meter

An indirect multi-rate three-phase meter and logger with MID class B accuracy

The Circutor CIRWATT B 410T 410-QT5A-90B10 (code QB870) is an indirect multi-rate three-phase energy meter and logger for 3 x 230/400 V networks measured through external current transformers (…/5 A). It is Class B in active energy under the European MID Directive (EN 50470), Class 1 per IEC 62053-21, and Class 2 in reactive energy per IEC 62053-23.

Circutor says the meter can be adapted to any type of industrial and tertiary installation through multiple communication options and expansion modules. It is suitable for low-voltage and medium-voltage supplies using external CTs, in shopping centres, industries and high-consumption residential areas (consumer type 3), with four quadrants for plants that both consume and generate.

CIRWATT B 410T functions

• Class B active energy (EN 50470), Class 1 (IEC 62053-21), Class 2 reactive (IEC 62053-23); four quadrants
• Multi-rate tariff programming: 9 tariff types, 12 days, 30 public holidays and 12 special days
• 12 billing closures per contract with programmable date and hour; two load curves, integration time 1 to 253 minutes
• Optical interface IEC 62056-21 plus RS-232 and RS-485 serial ports; REE (IEC 870-5-102) and Modbus RTU
• Optional expansion boards: auxiliary supply 24-48 Vdc, 6 digital outputs, or 4 outputs and 2 inputs
• Lithium back-up battery with a stated performance guarantee above 20 years at 30 C
• Temperature-compensated clock, below 0.5 s/day accuracy at 23 C; 8-digit LCD

CIRWATT B 410T QB870 technical specifications

Measurement and accuracy

Communication, memory and clock

Mechanical, environmental and standards

Finding the right CIRWATT B 410T code

The datasheet lists more than thirty codes in the family, differing by measuring voltage (3×57/100 to 3×230/400 V, or 3×63.5/110 and 3×127/220 V), current input (…/5 A or …/1 A), communication pair (RS-232, RS-485 or Ethernet) and accuracy; QB870 is the 3×230/400 V, …/5 A, RS-232 and RS-485 version. Circutor says other input, output and communication configurations are available on request. Check the VT or CT ratio and the tariff requirement of the utility, and send us the full code printed on the meter label when replacing a unit.

Installation and parametrization notes

The meter has a DIN 43859 enclosure of 172 x 255 x 67 mm and IP51 protection, so it belongs in a metering cubicle or panel. With indirect connection, current transformers of the …/5 A type supply the measurement; voltages are connected directly at 3 x 230/400 V. Tariffs, billing closures and load curve integration time are programmed through the communication ports. The lithium battery keeps the clock running during outages, with a performance guarantee above 20 years at 30 C.

Where the CIRWATT B 410T is used

Circutor lists shopping centres, industries and high-consumption residential areas for this meter, with four quadrants for solar plants that generate and consume. It is used for sub-metering and tariff billing where utility-style multi-rate data and communications are required; the approval status for revenue metering in a given utility must be confirmed locally, as the datasheet states only the MID and IEC classes.

Selection and installation notes

An indirect meter is wired through external current transformers, so confirm the transformer ratio, the accuracy class and the burden before ordering and enter the ratio in the meter set-up. Connect the voltage inputs through suitable fuses, respect the phase order and the polarity of the transformers, and confirm the communication and pulse settings with the metering or building management system. Seal the terminal covers where the tariff requires it and record the first readings.

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

Other CIRWATT B 410T codes are listed in the datasheet, such as QB880 (RS-232 and Ethernet), QB8A0 (RS-485 pair) and QB890 (RS-485 and Ethernet). Power factor correction is handled by the computer SMART III regulators and hybrid compensators.

Frequently asked questions

What accuracy class does the QB870 have?

Class B active energy (EN 50470) or Class 1 (IEC 62053-21), and Class 2 reactive energy.

What voltage and current does it measure?

Three-phase 3 x 230/400 V with external CTs of …/5 A.

Which communication ports?

RS-232 and RS-485 with REE (IEC 870-5-102) and Modbus RTU, plus an optical IEC 62056-21 port.

Can it log load curves?

Yes. It stores two load curves with programmable integration time from 1 to 253 minutes.

Is Seven Star LLC a distributor of Circutor?

No. Seven Star LLC is an independent supplier in Muscat, Oman, sourcing genuine Circutor products for GCC customers on request.

Documents and quotation

To request a quote, send the full model or order code, any options and the quantity. The reference document, the CIRWATT B 410T QB870 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 Metering Systems or the Circutor brand page.