# Three-phase energy meter FF Energy-3-OPTI-100 (model WI-MEF-3-OPTI-40) for consumption monitoring

**URL:** https://aio.lv/en/product--ff-wi-mef-3-opti-40--11785051
**Data updated:** 2026-03-08 22:56 (EET)
**Category:** Sensors & Detectors
**Manufacturer:** FF
**Manufacturer code:** WI-MEF-3-OPTI-40
**EAN:** 5902431676234
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 147.49 €
**Prices and availability valid until:** 2026-07-28 23:59
**Price without VAT (21%):** 121.89 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ff-wi-mef-3-opti-40--11785051

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 16.07.2026 | free |
| Pickup points | 21.07.2026 | 1.89 EUR |
| Courier delivery to door | 21.07.2026 | 4.99 EUR |

## Summary description

Three-phase energy meter FF Energy-3-OPTI-100 (WI-MEF-3-OPTI-40) is designed for measuring and monitoring electrical energy consumption in three-phase installations. It provides metering of active energy across three phases and is suitable for industrial and commercial distribution panels, energy audits and consumption monitoring. Use cases include billing verification, load analysis and subsystem monitoring.

## Long description

Three-phase energy meter FF Energy-3-OPTI-100 (model WI-MEF-3-OPTI-40) is designed for accurate measurement and monitoring of active electrical energy in three-phase installations. The device records energy consumption per phase and in total, enabling systematic tracking of demand and usage in industrial and commercial distribution panels. With a compact DIN-rail form factor it is suitable for installation in meter cabinets and control panels where space efficiency and reliable measurement are required.
Advantages
The FF Energy-3-OPTI-100 provides stable, repeatable active energy readings with a focus on straightforward integration into existing electrical distribution systems. Its three-phase metering capability allows separate phase analysis while delivering aggregated consumption data for billing verification and energy audits. The meter’s design supports installation on standard rails and offers clear display and connection points for quick commissioning and maintenance.
Suitable for
Industrial and commercial distribution panels
Energy audits and consumption verification
Billing cross-checks and cost allocation
Load analysis and imbalance detection
Subsystem and submetering in manufacturing or office facilities
Key specifications
Measurement type: active energy metering for three phases (per-phase and total)
Mounting: DIN-rail compatible housing for panel installation
Display: local numeric/segment display for energy values (integrated)
Input: three-phase voltage and current inputs suitable for standard low-voltage distribution systems
Accuracy: metering accuracy class suitable for monitoring and billing verification
Operating environment: designed for typical indoor electrical cabinet conditions
How to use
Install the meter on a standard DIN rail inside the distribution or metering panel and connect the three-phase voltage and current inputs according to the wiring diagram provided by the manufacturer. Ensure power is disconnected during wiring and that current inputs are connected with the correct orientation and any required current transformers if the installation uses CTs. After wiring, apply supply voltage, verify phase sequence and confirm that the display shows energy accumulation for each phase and total consumption. Use the meter readings to record baseline consumption and to compare against billing or other metering points.
Usage recommendations
For reliable long-term operation, mount the device in a dry, ventilated panel away from direct heat sources and excessive vibration. Verify compatibility with the site’s nominal voltage and, if current transformers are required, use CTs with matching ratios and accuracy class. Regularly verify readings during initial commissioning and include the meter in periodic inspection schedules to ensure accurate consumption monitoring.

## FAQ

### How much does the Three-phase energy meter FF Energy-3-OPTI-100 WI-MEF-3-OPTI-40 cost, and is it available for purchase?

The price is 147.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 6 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 16.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

### Can Three-phase energy meter FF Energy-3-OPTI-100 WI-MEF-3-OPTI-40 be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All FF products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized FF service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/11785051/67181161_large.webp