# Expansion Module for Current Transformers ZAMEL MRP-400A — interface module for CT inputs

**URL:** https://aio.lv/en/product--zamel-mrp-400a--12050686
**Data updated:** 2026-03-12 19:33 (EET)
**Category:** Home Automation
**Manufacturer:** ZAMEL
**Manufacturer code:** MRP-400A
**EAN:** 5903669495116
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 169.99 €
**Prices and availability valid until:** 2026-08-07 23:59
**Price without VAT (21%):** 140.49 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--zamel-mrp-400a--12050686

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 27.07.2026 | free |
| Pickup points | 30.07.2026 | 1.89 EUR |
| Courier delivery to door | 30.07.2026 | 4.99 EUR |

## Summary description

ZAMEL MRP-400A is an expansion module designed to interface with current transformers (CT). It provides additional CT inputs for measuring and monitoring electrical current signals, enabling integration with metering, protection or automation systems. The module is intended for mounting in electrical panels and supports reliable signal transmission from external current transformers for energy monitoring and control.

## Long description

ZAMEL MRP-400A is an expansion module created to accept signals from external current transformers (CT). Designed for DIN-rail mounting in electrical panels, this interface module increases the number of CT inputs available to metering, protection and automation systems. It ensures stable transmission of analogue current signals from transformers to monitoring devices and controllers, enabling centralised energy measurement and reliable integration into existing installations.
Advantages
The module offers additional CT input capacity while maintaining compact dimensions suitable for distribution boards. Its design focuses on stable signal transmission and electrical compatibility with standard CT outputs, reducing the need for rewiring or replacing existing measurement equipment. Mounting on DIN rail simplifies installation and maintenance in industrial and commercial switchgear environments.
Suitable for
Expanding CT input count in energy metering systems
Integrating additional current measurements into automation and building management systems
Connecting extra transformers for protection relays and monitoring devices
Retrofit projects in electrical panels where space is limited
Key specifications
Function: interface module for current transformer inputs
Mounting: DIN-rail compatible enclosure for electrical panels
Signal type: analogue current inputs from external CTs
Application: energy monitoring, protection and automation integration
Form factor: compact module suitable for distribution switchboards
How to use
Install the module on a standard DIN rail inside the distribution panel and connect secondary leads from external current transformers to the designated CT input terminals. Ensure correct polarity and secure terminal connections according to wiring diagrams supplied by the system integrator or manufacturer instructions. Route signal wiring separately from high-voltage or high-noise power cables to minimise interference. After wiring, verify continuity and measurement readings with the supervisory metering or protection equipment before commissioning.
Usage recommendations
Use the ZAMEL expansion module with CTs rated for the expected primary currents and ensure secondary burden and wiring meet the input requirements of the receiving meters or relays; follow local installation standards and perform functional tests after installation.

## FAQ

### How much does the Expansion Module ZAMEL MRP-400A cost, and is it available for purchase?

The price is 169.99 € (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 27.07.2026 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 Expansion Module ZAMEL MRP-400A 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 ZAMEL 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 ZAMEL 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/12050686/67536907_large.webp