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Selec MFM384 Digital Multifunction Power and Energy Meter
Selec MFM384 Multifunction Meter (Selec MFM384 multifunction meter) for measuring electrical energy and power consumption in panels and buildings. Available in the UAE from Auzar.
Description
The Selec MFM384 Multifunction Meter delivers comprehensive electrical load monitoring, revenue-grade measurement precision, and isolated digital telemetry engineered specifically for motor control centers (MCC), low-voltage switchboards, commercial sub-metering panels, and energy management systems (EMS).
Advanced Power and Energy Management with the Selec MFM384 Multifunction Meter
Engineered to replace clusters of individual analog panel meters with a centralized digital station, the Selec MFM384 Multifunction Meter captures more than 30 essential power and energy parameters across single-phase and three-phase electrical distribution networks. The instrument processes real-time true RMS values for phase-to-neutral voltages, phase-to-phase voltages, line currents, active power (kW), reactive power (kvar), apparent power (kVA), system frequency, and individual phase power factors.
The device features an intuitive operator interface with a high-contrast backlit LCD display that presents four lines of numerical data simultaneously alongside an analog bar graph showing instant percentage loading. System integrators can commission voltage and current transformer primary/secondary ratios directly via front-panel tactile pushbuttons or remotely over serial communications without requiring proprietary configuration adapters.
For facility-wide energy accounting and supervisory plant integration, the meter includes an optically isolated RS485 communication interface supporting standard open Modbus RTU protocol. It also incorporates a user-programmable pulse output relay for direct coupling to automation PLCs and digital input cards, simplifying tenant utility billing, peak demand analysis, and ISO 50001 energy audits.
Key Features and Engineering Advantages
- True RMS Electrical Calculation: Accurately measures distorted wave profiles and non-linear electrical loads with high stability and repeatability.
- Comprehensive Multi-Parameter Monitoring: Consolidates V, I, Hz, PF, kW, kVA, kvar, and bidirectional active/reactive energy totalization into one display.
- Universal CT/PT Ratio Programming: Programmable primary current up to 10,000 A and primary voltage up to 500 kV for medium- and low-voltage distribution grids.
- Isolated RS485 Modbus Telemetry: Enables remote supervisory monitoring, real-time logging, and cloud data aggregation via standard industrial serial networks.
- Compact 96 × 96 mm Bezel: Standard 1/8 DIN flush-mount housing fits standard switchboard cutouts with IP65-rated front environmental sealing.
Technical Specifications
| Technical Parameter | Specification Details |
|---|---|
| Product Series | Selec MFM384 Multifunction Meter |
| Electrical System Types | 3-Phase 4-Wire, 3-Phase 3-Wire, 2-Phase 3-Wire, 1-Phase 2-Wire |
| Voltage Measurement Range | 11 to 300 V AC (Phase to Neutral); 19 to 519 V AC (Phase to Phase) |
| Current Input Rating | Nominal 5 A AC (Min: 10 mA, Max: 6 A); 1 A AC optional |
| Measurement Accuracy | Active Energy: Class 1.0 (IEC 62053-21) / Class 0.5S (IEC 62053-22 optional); Voltage/Current: ±0.5% |
| Frequency Range | 45 to 65 Hz (±0.1% accuracy) |
| Serial Communication | RS485 2-wire half-duplex (Modbus RTU protocol, baud rate up to 38,400 bps) |
| Pulse Output | 1 × Optocoupler open collector output (configurable pulse duration and weight) |
| Auxiliary Power Supply | 100 to 240 V AC ±20% (50/60 Hz) / 100 to 300 V DC |
| Display Type | Backlit LCD (4 rows of 4 digits + bar graph display) |
| Mounting & Dimensions | Panel flush mount, 96 × 96 mm bezel (cutout: 92 × 92 mm, depth: 55 mm) |
| Ingress Protection | IP65 front bezel with gasket; IP20 rear terminal block |
| Operating Temperature | -10 °C to +55 °C; ≤ 85% RH non-condensing |
Industrial Applications and Process Integration
The Selec MFM384 Multifunction Meter is deployed across commercial, utility, and heavy manufacturing installations, including:
- Low-voltage and medium-voltage main distribution panels and motor control centers (MCC).
- Commercial tenant energy allocation and sub-metering across shopping centers and office towers.
- Industrial manufacturing plants targeting energy efficiency and ISO 50001 energy compliance.
- Diesel generator control panels, automatic transfer switches (ATS), and uninterruptible power systems (UPS).
Frequently Asked Questions
Can the current transformer (CT) primary and secondary ratings be programmed in the field?
Yes. The Selec MFM384 Multifunction Meter allows full parameterization of both CT primary (programmable from 1 A up to 10,000 A) and CT secondary (1 A or 5 A) directly via the front keypad or over the RS485 Modbus network.
Does the meter record both imported and exported active energy?
Yes. The meter features bidirectional energy calculation registers, accurately differentiating between imported and exported active power to support net-metering and solar PV grid-tied installations.
How is the meter protected against unauthorized programming changes?
The device includes a customizable password protection feature that restricts parameter modifications and totalizer resets, preventing accidental tampering or unauthorized changes during field operation.
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