# Energy meter ABB TERRA AC B21 112-100 single-phase 5 A Modbus RS485

**URL:** https://aio.lv/en/product--abb-2cma100150r1000--7276537
**Data updated:** 2026-01-13 11:24 (EET)
**Category:** Sensors & Detectors
**Manufacturer:** ABB
**Manufacturer code:** 2CMA100150R1000
**EAN:** 7392696001502
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 72.99 €
**Prices and availability valid until:** 2026-07-17 23:59
**Price without VAT (21%):** 60.32 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--abb-2cma100150r1000--7276537

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | Monday | free |
| Pickup points | 29.06.2026 | 1.99 EUR |
| Courier delivery to door | 29.06.2026 | 4.99 EUR |

## Summary description

ABB TERRA AC B21 112-100 is a single-phase energy meter with a 5 A measurement range and Modbus RS485 communication. Designed for accurate monitoring of electrical energy consumption in residential and commercial installations, it supports panel mounting and remote data readout via Modbus for integration into building energy management systems and automated monitoring.

## Long description

ABB TERRA AC B21 112-100 is a compact DIN-rail single-phase energy meter with a backlit display. Designed for residential and commercial installations, it supports direct connection in single-phase systems and can be used in 3- or 4-wire configurations. The meter provides active energy measurement, multiple instrumentation values, event logging and up to 25 configurable alarms. It features one programmable output for pulse or alarm signaling and RS-485 communication over Modbus RTU or EQ Bus. The device meets IEC and MID requirements and has accuracy class 1.0 (class B for MID meters).
Advantages
The meter combines a small 35 mm width with a readable backlit LCD for space-efficient panel mounting while keeping measured values accessible. Built-in Modbus RS-485 enables remote readout and integration into building energy management systems. A single programmable output and extensive alarm/event logging support local automation and fault indication. Polycarbonate housing with transparent front and IP20 protection ensures robust electrical insulation and safe installation inside distribution panels.
Suitable for
Residential electrical energy monitoring
Commercial and small industrial consumption metering
Panel mounting in distribution boards and metering cabinets
Integration with building management systems via Modbus RS-485
Key specifications
Connection: single-phase direct connected, suitable for 3- or 4-wire systems
Nominal input current: 5 A
Nominal input voltage: 220–240 V
Frequency range: 50 / 60 Hz
Power consumption: 0.414 W
Communication interface: Modbus RTU over RS-485 (also supports EQ Bus)
Output: one programmable pulse/alarm output
Accuracy class: 1.0 (or class B for MID meters)
Display: backlit LCD
Material: polycarbonate front (transparent glass), glass-reinforced polycarbonate upper and bottom case, polycarbonate terminal cover
Ingress protection: IP20 (for indoor panel installation)
Dimensions (W×H×D): 35 × 26.5 × 65 mm
Weight: 150 g
How to use
Mount the ABB TERRA AC B21 on a standard DIN rail inside a distribution board. Connect the phase and neutral conductors according to the 1-phase wiring diagram and ensure the nominal voltage and frequency match the installation. Connect the RS-485 interface for remote reading if required and configure Modbus parameters (baud rate, address, parity) to match the host system. Use the onboard menu and backlit display to view energy, power and other measured values and to configure alarms and the pulse output.
Usage recommendations
Install the meter in a dry, indoor distribution panel with IP20-rated protection and ensure correct polarity and secure terminal connections. Verify Modbus settings before commissioning and log measured values regularly when integrating into energy management systems. For MID verification or billing applications follow local regulations and calibration procedures.

## FAQ

### How much does the Energy meter ABB TERRA AC B21 112-100 cost, and is it available for purchase?

The price is 72.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 1 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 Monday 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: Cash payment, Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

### Can Energy meter ABB TERRA AC B21 112-100 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 ABB 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 ABB 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

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