# Voltage Relay FF CP-721-FPV single-phase programmable with LED display for photovoltaic installations

**URL:** https://aio.lv/en/product--ff-cp-721-fpv--12109274
**Data updated:** 2026-03-20 10:00 (EET)
**Category:** Solar Panel Accessories
**Manufacturer:** FF
**Manufacturer code:** CP-721-FPV
**EAN:** 5902431675077
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 74.49 €
**Prices and availability valid until:** 2026-07-21 23:59
**Price without VAT (21%):** 61.56 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ff-cp-721-fpv--12109274

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Pickup points | 17.07.2026 | 1.89 EUR |
| Courier delivery to door | 17.07.2026 | 4.99 EUR |

## Summary description

Single-phase programmable voltage relay FF CP-721-FPV with LED display designed for photovoltaic installations. Provides voltage monitoring and programmable protection functions for PV systems, allowing configuration via built-in display. Suitable for use in residential or small commercial solar arrays to protect inverters and electrical circuits from abnormal voltage conditions.

## Long description

Single-phase programmable voltage relay FF CP-721-FPV with LED display designed for photovoltaic installations. The device monitors single-phase supply voltage and provides configurable protection functions to detect and respond to overvoltage, undervoltage and other abnormal voltage conditions. The built-in LED display and user controls enable on-site configuration and status checking, making this relay suitable for protecting inverters, DC/AC converters and connected circuits in residential or small commercial solar arrays.
Advantages
The relay combines programmable thresholds and time delays with a clear LED display for straightforward setup and diagnostics. It offers secure switching to isolate circuits when voltage limits are exceeded or fall below preset values, reducing the risk of damage to inverters and electrical equipment. Compact DIN-rail mounting and clear front-panel indicators simplify installation and ongoing monitoring in distribution panels for photovoltaic systems.
Suitable for
Protection of inverters and AC circuits in residential solar installations
Small commercial photovoltaic arrays where single-phase monitoring is required
Use in distribution boards to prevent damage from overvoltage or undervoltage events
Retrofit applications where a programmable relay with local display is needed
Key specifications
Single-phase voltage monitoring
Programmable voltage thresholds for overvoltage and undervoltage protection
Adjustable time delays for trip and reset actions
LED display for real-time voltage readout and menu navigation
DIN-rail mountable housing suitable for electrical panels
Selectable switching behavior for automatic or manual reset
How to use
Mount the relay on a standard DIN rail in the distribution panel and connect the device according to the system wiring diagram, ensuring correct phase and neutral connections. Use the front-panel controls and LED display to set voltage thresholds and time delays that match the PV inverter and local grid requirements. After configuration, verify operation by observing the display and simulated voltage conditions or by monitoring normal system behavior during start-up and grid reconnect events.
Usage recommendations
Set threshold and delay values according to inverter manufacturer guidance and local grid codes. Verify wiring by a qualified electrician and perform functional tests after installation and after any maintenance. For systems with variable PV output, select appropriate time delays to avoid nuisance trips during transient fluctuations.

## FAQ

### How much does the Voltage Relay FF CP-721-FPV single-phase cost, and is it available for purchase?

The price is 74.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 12 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 14.07.2026 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, Installment. All transactions are 100% secure and encrypted.

### Can Voltage Relay FF CP-721-FPV single-phase be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### 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/12109274/67645308_large.webp