# Voltage and phase sequence indicator Unit UT-18D, three-phase sequence and voltage presence testing

**URL:** https://aio.lv/en/product--unit-ut-18d--11649014
**Data updated:** 2026-02-18 17:36 (EET)
**Category:** Measuring tools
**Manufacturer:** Unit
**Manufacturer code:** UT-18D
**EAN:** 6935750518045
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 43.49 €
**Prices and availability valid until:** 2026-07-16 23:59
**Price without VAT (21%):** 35.94 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--unit-ut-18d--11649014

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 03.07.2026 | free |
| Pickup points | 08.07.2026 | 1.99 EUR |
| Courier delivery to door | 08.07.2026 | 4.99 EUR |

## Summary description

The Unit UT-18D is a voltage and phase sequence indicator designed for testing three-phase systems. It detects voltage presence and verifies phase rotation (sequence) to ensure correct motor and equipment installation. Portable and easy to use, it helps electricians and technicians quickly identify phase order and live conductors, reducing wiring errors and downtime.

## Long description

The Unit UT-18D is a compact voltage and phase sequence indicator intended for testing three-phase electrical systems. It detects the presence of voltage on conductors and verifies phase rotation to confirm correct phase order. The device is portable and designed for field use by electricians and technicians who need a quick, reliable check of live conductors and phase sequence before energising motors, control panels or other three-phase equipment.
Advantages
The instrument provides rapid detection of voltage presence and clear indication of correct or incorrect phase rotation, reducing the risk of wiring errors. Its compact form factor and simple connection method make it suitable for use in confined spaces and on-site troubleshooting. The UT-18D operates without complex setup, enabling fast verification during installation, maintenance and repair tasks.
Suitable for
Verifying phase sequence during motor and pump installations
Checking live conductors before connecting three-phase panels and equipment
Troubleshooting phase-related faults and unexpected motor rotation
Routine maintenance inspections in industrial and commercial electrical installations
Key specifications
Function: phase sequence detection and voltage presence indication in three-phase systems
Input: designed for three-phase AC networks
Display: visual indicators for phase rotation and live conductor detection
Form factor: compact, handheld design for portable field use
Connections: quick-connect probes or socket-sensing contacts suitable for on-site testing
How to use
Before use, ensure appropriate personal protective equipment and follow site safety procedures. Connect the device to the three-phase conductors or to access points on the distribution equipment according to the manufacturer’s connection method. Observe the visual indicators to determine whether voltage is present and to read the phase rotation. If indicators show incorrect sequence or absence of voltage, isolate the circuit and investigate wiring or supply faults. After testing, disconnect the device and store it in a protective case.
Usage recommendations
Use the UT-18D only on de-energised or safely accessed conductors when practical, and always verify safe access and correct PPE when testing live circuits. Regularly inspect probes and contacts for wear or damage, and avoid exposure to moisture or excessive mechanical stress to maintain reliable operation.

## FAQ

### How much does the Voltage and phase sequence indicator Unit UT-18D cost, and is it available for purchase?

The price is 43.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 204 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 03.07.2026 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 Unit 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 Unit 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/11649014/67055223_large.webp