# FF phase sequence and phase loss relay CKF-337 1P 10A 0.2–5 s 20–60 V

**URL:** https://aio.lv/en/product--ff-ckf-337--12115838
**Data updated:** 2026-03-20 10:08 (EET)
**Category:** Sensors & Detectors
**Manufacturer:** FF
**Manufacturer code:** CKF-337
**EAN:** 5908312593225
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 39.49 €
**Prices and availability valid until:** 2026-07-29 23:59
**Price without VAT (21%):** 32.64 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ff-ckf-337--12115838

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 16.07.2026 | free |
| Pickup points | 21.07.2026 | 1.89 EUR |
| Courier delivery to door | 21.07.2026 | 4.99 EUR |

## Summary description

Electromechanical/electronic phase sequence and phase loss relay FF CKF-337 for single-pole (1P) installations. Detects phase loss and phase asymmetry, supports supply voltage 20–60 V and switching current up to 10 A. Adjustable time delay 0.2–5 seconds. Used to protect motors and three-phase equipment from incorrect phase order, phase failure and unbalanced supply.

## Long description

FF phase sequence and phase loss relay CKF-337 1P 10A 0.2–5 s 20–60 V is a compact electromechanical/electronic device designed to monitor three-phase supply conditions in single-pole installations. It detects incorrect phase rotation, phase loss and significant phase unbalance, and switches output contacts to protect motors and other three-phase loads. The unit accepts control voltages in the 20–60 V range and provides a switching capacity suitable for direct control of small contactors and loads up to 10 A, with an adjustable response delay between 0.2 and 5 seconds.
Advantages
The relay combines electromechanical reliability with electronic adjustment, offering clear detection of phase sequence errors and phase loss while allowing a selectable time delay to prevent nuisance tripping on transient events. Its single-pole (1P) configuration simplifies installation in control circuits and distribution panels, and the rated switching current up to 10 A supports a broad range of protection and control applications. The compact form factor and straightforward adjustment make it practical for retrofits and new installations where space and simplicity are important.
Suitable for
 Protection of three-phase motors against reversed phase rotation
 Detection of phase loss or phase unbalance in small distribution panels
 Control circuits for contactors and starters in industrial and commercial equipment
 Applications requiring low-voltage monitoring within 20–60 V supply systems
Key specifications
 Operating function: phase sequence detection and phase loss protection
 Poles: single-pole (1P)
 Supply voltage range: 20–60 V
 Adjustable time delay: 0.2–5 s
 Switching current: up to 10 A
 Combined electromechanical/electronic design for reliable switching and adjustment
How to use
Mount the relay in the control panel or on a DIN rail according to the installation instructions for single-pole devices. Connect the three-phase sensing inputs and the low-voltage supply within the specified 20–60 V range, and wire the output contact to the motor starter or load circuit rated for the relay's 10 A switching capacity. Set the desired time delay between 0.2 and 5 seconds to prevent tripping during short transients. Verify correct phase rotation and perform a functional test before placing the protected equipment into normal operation.
Usage recommendations
Use the relay with loads and contactors that do not exceed the 10 A switching rating, and ensure supply voltage remains within 20–60 V. Select a time delay sufficient to ignore brief voltage dips but short enough to protect equipment from prolonged phase faults. Periodically inspect connections and test the device as part of routine maintenance to ensure continued protection of motors and three-phase equipment.

## FAQ

### How much does the FF phase sequence and phase cost, and is it available for purchase?

The price is 39.49 € (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 16.07.2026 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/12115838/67650997_large.webp