Modular three-phase energy meter | 63 A | direct connection | 100–480 V | Modbus | IP20/IP40 | DIN | Acti9 iEM3150 | Schneider Electric A9MEM3150

Modular three-phase electricity meter | 63 A | direct connection | 100–480 V | Modbus | IP20/IP40 | DIN | Acti9 iEM3150 | Schneider Electric A9MEM3150

A9MEM3150 – a Schneider Electric Acti9 iEM3150-series modular three-phase electricity meter, direct connection up to 63 A, with an RS485 Modbus communication port, DIN rail mounted. Designed for metering electricity consumption on individual circuits, tenants or groups of equipment, where the data needs not only to be visible on a display but also transmitted to a building management (BMS) or energy-monitoring system.

Key idea:
A building's or a factory's energy consumption can only be managed once it is measured at the individual circuits, not only at the incomer. The iEM3150 combines three things often missing from cheap meters: direct connection up to 63 A without current transformers, a universal 100–480 V voltage range, and a standard Modbus RS485 port through which readings are fed automatically into SCADA, a BMS or an energy-management application. It is a single-tariff meter for internal metering and monitoring, not billing metering with the grid operator – the A9MEM3150 has no MID approval; the MID version with Modbus is the A9MEM3155.

What makes the A9MEM3150 worthwhile?
It turns an ordinary meter into a data source: with one RS485 cable, dozens of such meters in a board can be read out for every tenant's or workshop's consumption every hour, with no need for site visits or manual transcription. It is also certified as a sub-meter to ANSI C12.20, EAC and NMI M 6-1, so it is also suitable for internal cost allocation between departments.

• Active energy metering – cumulative kWh register up to 99,999,999.9 kWh, without overflow over the whole service life.
• Direct connection up to 63 A – the cable connects straight into the meter, no CT and no ratio configuration.
• RS485 Modbus port – readings can be read out into a BMS, SCADA, PLC or energy-management application.
• Universal 100–480 V voltage – the same model for a 230/400 V network and for 1P+N or 3P without neutral arrangements.
• LCD display – local readings visible without any communication infrastructure.
• Sub-meter certifications – ANSI C12.20, EAC and NMI M 6-1 approval for internal metering and cost allocation.

• Metering electricity consumption of tenants in offices and shopping centres
• Monitoring energy consumption of production workshops and equipment lines
• Building management systems (BMS) with a Modbus RS485 bus
• Power circuits of data centre and server-room racks up to 63 A
• Metering electric-vehicle charging stations on separate circuits
• Consumption measurement for heat pumps, ventilation and cooling equipment
• Energy-audit and ISO 50001 monitoring points in distribution boards
• Metering of shared areas and lift circuits in apartment blocks

In an office building with 12 tenants, each supply is protected by a 40–63 A breaker. In each tenant's section of the board, one A9MEM3150 is installed on direct connection; all 12 are linked by a single RS485 line with unique Modbus addresses 1–12 and read out by a BMS controller. Every month the administrator gets a kWh report from the system for each tenant without a site visit, and each tenant can see their own readings on the meter's LCD display.

• Install only with the voltage disconnected and the circuit confirmed dead; work must be carried out by a qualified electrician.
• The meter does not protect the circuit – a circuit breaker no larger than 63 A is required upstream of it.
• Terminals up to 16 mm² – choose the cable cross-section according to the 63 A load and installation conditions.
• Use shielded twisted-pair cable for the RS485 bus, fit 120 Ω resistors at the ends, and observe A/B polarity.
• Assign a unique Modbus address to each meter on the bus, and match the baud rate and parity with the controller.
• The device is rated for overvoltage category III and pollution degree 2 – use an IP-rated enclosure in an unprotected environment.

Quick selection guide

Are current transformers needed?
No – up to 63 A the meter is connected directly. For higher currents choose the CT version.

Is it suitable for billing with the electricity supplier?
Official billing metering is carried out by the grid operator's meter. The iEM3150 has no MID approval and is intended for internal metering; if MID metering with Modbus is required, choose the A9MEM3155.

What protocol does it support?
Modbus RTU over the RS485 port – supported by most BMS, SCADA and PLC controllers.

Does it work in a single-phase network?
Yes, the 1P+N arrangement is supported, as well as 3P and 3P+N.

How many meters can be linked on one RS485 line?
A standard RS485 bus allows up to 32 devices without a repeater; the exact number depends on the controller and cable length.

Is there a pulse output?
No – the source states 0 inputs and 0 outputs, data is transmitted only via Modbus.

Does it support day/night tariffs?
No – the iEM3150 is a single-tariff meter, multi-tariff metering is not supported.

Modular three-phase electricity meter | 63 A

A9MEM3150 – a Schneider Electric Acti9 iEM3150 modular three-phase meter, direct connection up to 63 A, 100–480 V, with an RS485 Modbus port, LCD display, single-tariff metering (no MID) and DIN mounting. Designed for internal energy metering and monitoring in offices, production facilities, data centres and BMS systems, where readings need to reach the management application automatically.