# Phase sequence, phase loss and asymmetry relay FF CKF-B 10A 1-pole 4 s 55 V

**URL:** https://aio.lv/en/product--ff-ckf-b--12107222
**Data updated:** 2026-03-20 09:57 (EET)
**Category:** Sensors & Detectors
**Manufacturer:** FF
**Manufacturer code:** CKF-B
**EAN:** 5908312593058
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 25.99 €
**Prices and availability valid until:** 2026-07-08 23:59
**Price without VAT (21%):** 21.48 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ff-ckf-b--12107222

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 02.07.2026 | free |
| Pickup points | 07.07.2026 | 1.99 EUR |
| Courier delivery to door | 07.07.2026 | 4.99 EUR |

## Summary description

Electromechanical protection relay FF CKF-B designed to monitor phase sequence, phase loss and phase asymmetry. Rated for up to 10 A with a single normally open contact (1Z), adjustable response time 4 seconds and operating voltage 55 V. Used to protect three-phase motors and equipment from incorrect phase order, missing phases or voltage imbalance in industrial and commercial installations.

## Long description

Electromechanical relay FF CKF-B monitors phase sequence, phase loss and phase asymmetry in three-phase electrical systems. The device is intended for installation in control panels and motor protection circuits and provides a single normally open contact for signaling or interlocking. Rated for currents up to 10 A and designed to operate from a 55 V supply, the relay includes an adjustable response time of 4 seconds to prevent nuisance trips on short disturbances.
Advantages
This relay combines simple electromechanical construction with clear functional monitoring of phase order, phase absence and voltage imbalance. The single normally open contact enables straightforward integration with starters, contactors or alarm circuits. An adjustable delay of up to 4 seconds reduces false operations from transient events. The compact, DIN-rail compatible form factor facilitates installation in industrial and commercial control cabinets.
Suitable for
Protection of three-phase motors against incorrect phase sequence
Prevention of equipment operation during phase loss
Monitoring voltage asymmetry in distribution and control systems
Integration with motor starters, contactors and interlock circuits
Key specifications
Function: phase sequence detection, phase loss detection, phase asymmetry monitoring
Contact configuration: 1 normally open contact (1-pole)
Rated switching current: up to 10 A
Operating supply voltage: 55 V
Adjustable response (delay) time: up to 4 s
Type: electromechanical relay suitable for DIN-rail or panel mounting
How to use
Install the relay in the control cabinet and connect the three-phase supply and the relay coil according to the wiring diagram supplied with the device. Wire the normally open contact into the starter or alarm circuit that must be opened when a phase fault is detected. Set the response-time adjustment to a value that filters short transients but reacts to sustained phase faults; typical settings depend on system dynamics and starting currents. After wiring, perform a functional test by simulating phase loss, reversed phase sequence and asymmetric voltages to confirm correct operation.
Usage recommendations
Use the adjustable delay to balance sensitivity and immunity to transient disturbances; verify compatibility with motor starting characteristics and coordinate with upstream protection devices. Ensure the relay is mounted in a ventilated panel environment and that terminal connections are tightened to the manufacturer’s recommended torque values.

## FAQ

### How much does the Relay FF CKF-B — phase sequence and loss 10A 1Z cost, and is it available for purchase?

The price is 25.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 321 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 02.07.2026 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

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