Fox ESS 3-Phase Auto Grid-To-Backup Power Switching Box
Fox ESS 3-Phase Auto Grid-To-Backup Power Switching Box additional 1Fox ESS 3-Phase Auto Grid-To-Backup Power Switching Box additional 2

£166.66 ex VAT£199.99 inc VAT

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Product features

  • Seamless backup power switching
  • Compatible with Fox ESS inverters
  • Works with battery systems
  • Automatic 3-phase backup switching
  • Robust IP65 metal enclosure
  • Indoor or outdoor installation
  • Compact, lightweight design
  • Installer-friendly wall mounting
Product code: 3PH-4UNIT
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Description

The Fox ESS EPS 3PH-4UNIT 3-Phase Automatic Backup Switching Box works with a battery and inverter system to seamlessly transition to automatic backup power during grid failures. It's a high-performance, three-phase emergency power supply solution designed to ensure your solar-plus-storage system never misses a beat. Engineered for both residential and light-commercial installations, it guarantees consistent power stability for essential loads when continuity matters most.

Built with reliability at its core, this robust EPS unit switches effortlessly between grid and backup modes, maintaining smooth operation across all three phases without the need for manual intervention. Its durable IP65 metal enclosure provides long-lasting environmental protection, making the unit suitable for indoor plant rooms as well as exposed outdoor locations.

Optimised for integration within the Fox ESS ecosystem, the EPS 3PH-4UNIT pairs perfectly with the brand’s leading three-phase inverters, including the H3, AIO H3, and H3 Smart series. Compact, lightweight, and naturally cooled for silent operation, the unit offers installers and end-users a future-ready backup solution that is easy to fit, dependable in all conditions, and engineered for long-term resilience.

With flexible voltage compatibility, high current capacity, and reliable performance across temperatures from –25 °C to +50 °C, this three-phase EPS box is tailored for those who require dependable energy security without compromise. The EPS box does not supply power by itself, it switches power from the inverter/battery system to the home or building during an outage.

  • Automatic Three-Phase Backup Switching: Seamlessly transitions to backup power during outages, ensuring essential loads remain energised across all phases
  • Robust IP65 Weatherproof Enclosure: Tough metal housing provides complete protection from dust & water, suitable for indoor or outdoor wall-mounting
  • Optimised for Fox ESS Inverters: Designed to integrate quickly & cleanly with Fox ESS H3, AIO H3 & H3 Smart inverter systems
  • Compact, Lightweight & Installer-Friendly: Streamlined dimensions & wall-mount design enable fast, straightforward installation with minimal disruption
  • Silent, Fan-Free Cooling: Natural cooling ensures quiet operation & long-term durability with fewer moving parts
  • High-Performance Electrical Capability
    • Voltage compatibility: 220/380 VAC or 230/400 VAC (3L/N/PE)
    • Grid input current: up to 80 A per phase
    • EPS input current: up to 20 A per phase, organised into four circuits
    • EPS load output: up to 80 A per phase
  • Built for Extreme Conditions: Reliable operation from –25 °C to +50 °C, ideal for varying UK climates
  • Dimensions (W*H*D): 336mm x 306mm x 138mm | Net Weight: 6kg

Why It Exceeds Expectations

  • Security in Any State: Whether grid-connected or off-grid, the EPS 3PH‑4UNIT ensures critical loads stay powered with fast, automatic switching.
  • Built to Last: Reliable IP65 construction ensures durable performance in a variety of environments - from dusty garages to exposed outdoor walls.
  • Future-Ready Flexibility: Made to align with Fox ESS hybrid inverters, this backup box supports upgrades and system expansion with ease.
  • Installer-Centric Design: Compact dimensions, lightweight body, and simple mounting make setup hassle-free - without compromising on safety or scalability.

Code: 3PH-4UNIT

DELIVERY POLICY

Last updated 17th September, 2024

This Shipping & Delivery Policy is part of our Terms of Service ("Terms") and should be therefore read alongside our main Terms: https://www.ecowizard.co.uk/terms-and-conditions/.

Please carefully review our Shipping & Delivery Policy when purchasing our products. This policy will apply to any order you place with us.

What are my Shipping & Delivery Options?

We offer various shipping options. In some cases a third-party supplier may be managing our inventory and will be responsible for shipping your products.

FREE Shipping

We offer FREE 2-3 working day delivery on all orders over £99 exVAT received before 4pm. All orders placed under £99 exVAT are charged at £6 (£5 ExVAT).

For Portable Power please allow up to 4 working days for delivery and Solar Panels are shipped via our pallet delivery service which is a £100.

Next Day Delivery

We also offer Next Working Day Delivery on all orders received before 2pm. Once again, all orders placed after 2pm on a Friday and at the weekend will be processed on Monday and then sent out for Next Working Day Delivery.

Northern Ireland, Highlands & Channel Islands 

Please contact us for our shipping rates to Northern Ireland, Scottish Highlands & Channel Islands.

Please note; we can't currently ship portable power items to Northern Ireland due to insurance issues with the courier.

Do you deliver Internationally?

We do not offer international shipping.

What happens if my order is delayed?

If delivery is delayed for any reason we will let you know as soon as possible and will advise you of a revised estimated date for delivery.

For EU and UK consumers: This does not affect your statutory rights. For more information please refer to our Terms.

Questions about Returns?

If you have questions about returns, please review our Return Policy: https://www.ecowizard.co.uk/returns/.

How can you contact us about our Delivery?

If you have any further questions or comments, you may contact us by:

  • Email: orders@ecowizard.co.uk

RETURN POLICY

Last updated May 23, 2024

Thank you for your purchase, we hope you are happy with it.

However, if you are not completely satisfied with your purchase for any reason, you may return it to us for a full refund, store credit, or an exchange; please see below for more information on our returns policy.

RETURNS

If you find you have received the wrong or damaged item(s), you need to contact us within 7 days of receipt of goods. Any time after this you are responsible for returning the goods at your own cost following the standard returns process.

All returns must be postmarked and in writing within fourteen (14) days of the purchase date. All returned items must be in a new, unopened and unused condition, with all original tags and labels attached.


RETURN PROCESS

To return an item, please click the ‘Download Returns Form’ below and complete all data fields. You can then email this to our team once completed.
Place your item(s) securely in its original packaging along with the returns form.
Please note that the RMA# on the returns address is your original order number; please ensure to reference this on the returns address, as per below.
You are now ready to mail your return to the following address:

Attn: Returns
RMA #/Order No -
Eco WizardUnderfloor Wizard Ltd t/a ECO Wizard
Beechfield House
Winterton Way
Macclesfield
Cheshire
SK11 0LP
United Kingdom

We ask that all customers when returning products send the goods via a trackable courier service. Underfloor Wizard Ltd t/a ECO Wizard will not be held responsible for goods which do not arrive at our premises.

Please note, you will be responsible for all return shipping charges, unless in the instance of damaged/faulty goods received in which case we can issue you with a returns label to cover the cost of postage.

Download Returns Form

REFUNDS

After receiving your return and inspecting the condition of your item, we will process your return or exchange. Please allow at least seven (7) days from the receipt of your item to process your return or exchange. Refunds may take 1-2 billing cycles to appear on your credit card statement, depending on your credit card company. We will notify you by email when your return has been processed.

Faults on installed products: 

If a product that has been installed develops a fault, please contact us, do not uninstall the product yourself. We will arrange for an engineer or technical support from the brand to assist with diagnosing the fault. Once the fault has been confirmed we can then arrange for the necessary next steps to occur.


EXCEPTIONS

The following items cannot be returned or exchanged:

  • opened box, damaged, missing or incomplete items cannot be returned.
  • items that have been installed.


QUESTIONS
If you have any questions concerning our return policy, please contact us at: returns@ecowizard.co.uk

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