Iskra iMC330 Three-Phase Multimeter, 600 V Autorange

iMC330 is the Iskra three-phase panel multimeter for monitoring low-voltage networks. It measures true RMS voltage and current with automatic current ranging, keeps four four-quadrant energy counters with tariffs, and offers 16 programmable alarms. The same data sheet describes the iMC350 network recorder, which adds an 8 MB recorder to the same hardware family.

A DIN-style panel multimeter with energy counters and alarms

The iMC330 measures more than 60 quantities in single-phase and three-phase systems, including U, I, P, Q, S, power factor, power angle, frequency, THD and maximum demand, with harmonics up to the 31st. It records energy like an electricity meter in all four quadrants and up to four tariffs, so one device can serve as a sub-meter, a monitoring point and a basic control unit.

Two optional module slots, each carrying a double input or output module, let the meter drive pulse, relay or alarm outputs and read tariff or digital inputs. Settings can be made with five front keys on the illuminated 128 x 64 graphic LCD, or from a PC with the free MiQen software over RS232, RS485 or USB.

Features stated in the data sheet

• Autorange measurement up to 600 VL-N and 12.5 A; active energy accuracy class 0.5S.
• Four energy counters switched by a tariff input (the tariff clock belongs to the iMC350); harmonics up to the 31st.
• Up to four I/O points: tariff inputs, digital inputs, pulse or relay outputs.
• Modbus RTU and DNP3 protocols; RS232, RS485 or USB communication; service USB for set-up without auxiliary power.

Technical specification

Measurement inputs and accuracy (data sheet)

Supply, enclosure and environment

Reading the ordering code

The ordering code in the data sheet has nine positions: device type, current connection (T through-hole or C screw terminal), frequency, voltage input (ARNG autorange 50 – 500 V, or fixed 63V5, 110V, 240V), energy accuracy class (S active class 1, H active class 0.5S), auxiliary supply letter (U universal full range, A to J fixed AC voltages), communication (N without, S RS232, D RS485, U USB), I/O module 1/2 and I/O module 3/4.

Finish options are A standard, P IP54, H tropical seal (HVE) and S ship version. The data sheet example iMC350 S ARNG S U U M T T A describes a recorder with universal supply, relay and tariff modules and USB.

Installation notes from the user manual

Before energising, check nominal voltage, supply voltage, frequency, voltage ratio, phase sequence and current-transformer ratio. The manual recommends a protection fuse of maximum 6 A (red-dot type or equivalent) and states that a current transformer secondary must be short-circuited before the meter is connected.

The service USB port is not galvanically isolated: supply and measuring voltages have to be disconnected while it is used, and the connection is time limited. Compare every module and communication terminal with the label before wiring.

Typical uses in industrial and utility panels

General engineering note: a three-phase multimeter with alarm outputs and pulse outputs suits motor control centres, generator and feeder panels, and building distribution boards. The tariff inputs and clock allow time-of-use sub-metering, and the 16 alarms can drive relay outputs for over and under voltage, frequency or overload supervision.

The tropical and Bureau Veritas ship versions listed in the data sheet suit humid or marine installations; confirm option letters before ordering.

Related Iskra items

The iMC350 network recorder shares this data sheet and adds 8 MB of flash memory, M-Bus and analogue outputs. For class S accuracy with Ethernet and an SD card see the iMC740; all devices use the MiQen software. Browse the power meters category for other types.

Frequently asked questions

What does iMC330 measure?

The data sheet lists true RMS current and voltage, active, reactive and apparent power, power factor, angles, frequency, THD, harmonics up to the 31st, minimum and maximum values and energy in four quadrants.

What is the difference between iMC330 and iMC350?

Both share the data sheet. The iMC350 has an 8 MB recorder, M-Bus and analogue output options and a tariff clock with calendar; the iMC330 has service USB and no recorder.

Which communication protocols are supported?

Modbus RTU and DNP3 over RS232, RS485 or USB, with M-Bus on the iMC350. Transfer rate is 2.4 to 115.2 kBaud on serial ports.

What panel cut-out does iMC330 need?

The data sheet gives a cut-out of 92 mm plus 0.8 mm for panel mounting; the meter weighs up to 500 g.

Is Seven Star LLC an Iskra distributor?

No. Seven Star LLC is an independent supplier in Muscat that sources Iskra products on request.

Documents and quotation

The official Iskra datasheet and user manual for iMC330 are hosted on this page for download. Seven Star LLC is an independent supplier in Muscat; send your quantity and delivery location through the quotation form and we will quote this item. Please confirm the exact order code, supply voltage and output options against the documents before ordering. More related products: product category.