# Lumel LCTB 7440 Current Transformer, 300A/5A, Busbar Aperture 74/40

**URL:** https://aio.lv/en/product--lumel-lctb-7440450300a55--12445906
**Data updated:** 2026-05-18 02:48 (EEST)
**Category:** Sensors & Detectors
**Manufacturer:** Lumel
**Manufacturer code:** LCTB 7440450300A55
**EAN:** 5901769490451
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 47.99 €
**Prices and availability valid until:** 2026-07-30 23:59
**Price without VAT (21%):** 39.66 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--lumel-lctb-7440450300a55--12445906

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 17.07.2026 | free |
| Pickup points | 22.07.2026 | 1.89 EUR |
| Courier delivery to door | 22.07.2026 | 4.99 EUR |

## Summary description

The Lumel LCTB 7440 current transformer is designed for precise current measurement in electrical systems. Featuring a 300A/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 networks.

## Long description

The Lumel LCTB 7440 current transformer is a high-precision component engineered for the accurate measurement of electrical currents within industrial power systems. With a transformation ratio of 300A/5A and a specific busbar aperture of 74/40 mm, this device facilitates the reliable conversion of high primary currents into manageable secondary signals suitable for monitoring, metering, and protection equipment.
Advantages
This current transformer offers exceptional reliability and measurement accuracy, ensuring that power distribution networks operate within safe and efficient parameters. Its robust construction is designed to withstand the rigors of industrial environments, providing long-term stability for critical electrical infrastructure. The design allows for straightforward integration into existing busbar systems, minimizing installation time and complexity while maintaining high performance standards for signal conversion.
Suitable for
Industrial power distribution networks
Electrical energy monitoring and metering systems
Protection relay applications
Current measurement in switchgear panels
When it may not be suitable
This device is not intended for use in residential low-voltage circuits where the current levels are significantly below the 300A rating, as accuracy may be compromised. It is also not suitable for applications requiring non-contact measurement on insulated cables without a busbar interface.
Key specifications
Transformation ratio: 300A/5A
Busbar aperture dimensions: 74 mm x 40 mm
Application: Industrial current measurement
Compatibility: Standard busbar systems
How to use
The Lumel LCTB 7440 must be installed by a qualified professional in accordance with local electrical safety regulations. The primary busbar should be passed through the 74/40 mm aperture, ensuring a secure and centered fit. The secondary terminals should be connected to the corresponding inputs of the measuring or protection device using appropriate wiring. Ensure all connections are tightened to the specified torque to prevent overheating or signal loss.
What to consider before purchase
Verify that the primary current of your system matches the 300A rating.
Ensure the physical dimensions of your busbar are compatible with the 74/40 mm aperture.
Confirm the secondary input requirements of your monitoring or protection equipment match the 5A output.
Usage recommendations
Always ensure the secondary circuit of the current transformer is connected to a load or short-circuited before energizing the primary circuit to prevent dangerous high-voltage build-up.

## FAQ

### How much does the Lumel LCTB 7440 Current Transformer 300A/5A cost, and is it available for purchase?

The price is 47.99 € (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 17.07.2026 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

https://aio.lv/img/cache/product/12445906/68749112_large.webp