# Lumel LCTB 7440 Current Transformer, 250A/5A, Busbar Aperture 74/40

**URL:** https://aio.lv/en/product--lumel-lctb-7440450250a55--12469283
**Data updated:** 2026-05-18 09:26 (EEST)
**Category:** Sensors & Detectors
**Manufacturer:** Lumel
**Manufacturer code:** LCTB 7440450250A55
**EAN:** 5901769490437
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 56.99 €
**Prices and availability valid until:** 2026-08-09 23:59
**Price without VAT (21%):** 47.10 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--lumel-lctb-7440450250a55--12469283

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 29.07.2026 | free |
| Pickup points | 03.08.2026 | 1.89 EUR |
| Courier delivery to door | 03.08.2026 | 4.99 EUR |

## Summary description

The Lumel LCTB 7440 current transformer is designed for precise current measurement in electrical systems. Featuring a 250A/5A transformation ratio and a 74/40 mm busbar aperture, this device ensures reliable signal conversion for monitoring and protection equipment. It is suitable for industrial applications requiring accurate current monitoring and integration into power distribution panels.

## Long description

The Lumel LCTB 7440 current transformer is a high-precision device engineered for the reliable measurement of alternating currents in electrical power systems. With a transformation ratio of 250A/5A and a specifically designed busbar aperture of 74/40 mm, this transformer facilitates the accurate conversion of high primary currents into manageable secondary signals suitable for monitoring, metering, and protection relays.
Advantages
This current transformer offers exceptional measurement accuracy and long-term stability, ensuring consistent performance in demanding industrial environments. Its robust construction allows for seamless integration into existing power distribution infrastructures, providing a safe and efficient method for galvanic isolation between high-voltage circuits and secondary measurement equipment. The design prioritizes ease of installation, allowing for quick mounting onto busbars while maintaining high operational safety standards.
Suitable for
Industrial power distribution panels
Energy management and monitoring systems
Protection relay circuits
Electrical sub-metering applications
This device may not be suitable for applications involving direct current (DC) measurement, as it is specifically designed for alternating current (AC) systems. Furthermore, it should not be used in environments where the primary current consistently exceeds the rated 250A capacity, as this may lead to measurement inaccuracies or potential damage to the transformer core.
Key specifications
Transformation ratio: 250A/5A
Busbar aperture dimensions: 74 mm x 40 mm
Application: Alternating current (AC) measurement
Design: Through-type current transformer
To use the Lumel LCTB 7440, ensure the primary conductor is passed through the central aperture of the transformer. The secondary terminals should be connected to the measuring or protection device using appropriately sized wiring. It is essential to ensure that the secondary circuit is never left open while the primary current is flowing, as this can generate dangerous high voltages.
What to consider before purchase
Verify that the busbar dimensions do not exceed the 74/40 mm aperture size
Confirm that the 250A primary current rating matches your system requirements
Ensure compatibility with your secondary monitoring or protection equipment
For optimal performance and safety, always ensure that all electrical connections are tightened to the manufacturer's specifications and that the transformer is installed by qualified personnel in accordance with local electrical regulations.

## FAQ

### How much does the Lumel LCTB 7440 Current Transformer 250A/5A cost, and is it available for purchase?

The price is 56.99 € (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 29.07.2026 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. All transactions are 100% secure and encrypted.

### 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 Lumel 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 Lumel 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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