# Phase sequence and loss relay FF CKF-BR-TRMS 10A 1NO/1NC True RMS 40–80V delay 4s DIN-rail

**URL:** https://aio.lv/en/product--ff-ckf-br-trms--12107411
**Data updated:** 2026-03-20 09:58 (EET)
**Category:** Sensors & Detectors
**Manufacturer:** FF
**Manufacturer code:** CKF-BR-TRMS
**EAN:** 5902431673639
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 33.49 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 27.68 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ff-ckf-br-trms--12107411

## 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

Industrial phase sequence and phase-loss monitoring relay FF CKF-BR-TRMS detects phase rotation, missing phase and asymmetry in three-phase systems. Operates on 40–80 V with True RMS measurement, provides one changeover (1NO/1NC) contact rated 10 A, and includes a 4 s adjustable delay. Designed for DIN-rail mounting in motor control and protection panels.

## Long description

The FF phase sequence and phase-loss relay CKF-BR-TRMS monitors rotation, missing phases and voltage asymmetry in three-phase electrical systems. Designed for industrial control and protection panels, the relay measures True RMS values over an input range of 40–80 V and issues a switching response through a single changeover contact (1NO/1NC) rated for 10 A. The unit is intended for DIN-rail mounting and incorporates an adjustable 4 second delay to prevent nuisance trips during transient conditions.
Advantages
The relay uses True RMS measurement to accurately detect phase loss and asymmetry even with distorted waveforms. Its compact DIN-rail design simplifies integration into motor control and distribution panels. A single changeover contact with a 10 A rating provides a direct interface to starters, contactors or alarm circuits. The adjustable 4 s delay reduces false alarms caused by short-term disturbances while maintaining reliable protection of equipment.
Suitable for
Monitoring phase rotation and phase loss in three-phase motor control panels
Protecting motors, contactors and industrial equipment from phase asymmetry
Integration into DIN-rail control cabinets and distribution boards
Key specifications
Measurement type: True RMS phase monitoring
Input voltage range: 40–80 V (three-phase)
Contacts: 1 changeover (1NO/1NC), rated 10 A
Adjustable response delay: 4 seconds
Mounting: DIN-rail
Functionality: phase rotation detection, missing phase detection, phase asymmetry monitoring
How to use
Mount the relay on a standard DIN rail inside the control or distribution panel and connect the three-phase supply to the designated input terminals following electrical safety standards. Configure the output connection to the starter, contactor coil or alarm circuit using the changeover contact. Set the 4 s delay as required to suppress transient-induced trips; verify wiring and settings before energizing the system. Perform functional checks by simulating phase loss or reverse rotation where safe and appropriate.
Usage recommendations
Use the relay as part of a coordinated motor protection scheme: combine with overcurrent, thermal and short-circuit protection devices. Where harmonic distortion is expected, rely on the True RMS measurement for accurate detection. Periodically inspect terminals for tightness and ensure the relay is mounted in a vibration-free location within the DIN-rail cabinet.

## FAQ

### How much does the Phase sequence relay FF CKF-BR-TRMS cost, and is it available for purchase?

The price is 33.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 4 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 FF 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 FF 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/12107411/67643821_large.webp