• EV letterbox charging extension lead with UK 3-pin plug, inline RCD safety unit, letterbox adaptor, and weatherproof outdoor socket, coiled on a white background
  • EV letterbox charging extension lead through a front door
  • Weatherproof in-line connector of the EV letterbox charging extension lead shown unplugged, with the female half (socket) and green-sealed male plug
  • Step-by-step diagram showing how to couple and decouple the weatherproof letterbox cable connector on a Stella Charge EV letterbox extension lead
  • Heavy Duty EV Weatherproof Extension Cable & RCD Protection Device
  • 13A outdoor extension lead's heavy-duty plug detail, side profile and plan view
  • Stella Charge's EV 3-pin charger letterbox extension lead 13A switched socket enclosure with cover open
  • Drawstring Rucksack (Blue) for EV Charging Cables & Extension Leads with Stella Charge logo
  • Front cover of the printed user manual for the EV letterbox charging extension lead, showing the product line drawing and safety guidance
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EV Letterbox Charging Extension Lead (UK 3-Pin)

EV Letterbox Charging Extension Lead (UK 3-Pin)

Hassle-free home charging for your hybrid or EV, directly through your letterbox. Our EV-rated extension lead, fitted with a detachable inline connector, delivers a safe, reliable charge from any UK indoor socket, keeping your car topped up without compromising your home's security.

£119.95 GBP
£94.95 GBP £119.95 GBP
Sale Sold out
Incl. UK VAT
Output & Safety
Split Cable Connection
Length
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About this product

  • No installation: plugs directly into your existing mains socket
  • Inline 'plug-in, plug-out' cable connector to pass through narrow gaps
  • Built-in RCD protection
  • End-to-end weatherproof protection for outdoor charging
  • IP-rated outdoor socket with lockable cover
  • PAT tested

Specification

General Information

  • Model(s): STL-3EXT-LBOX
  • Certification: CE, UKCA
  • Manufacturer's Warranty: 12 Months

Rated Output

  • Power Rating: 3.3kW
  • Current Rating: 13A
  • Operational Voltage (AC): ±230V

Operating Environment

  • Weather Protection: IP66
  • Operational Temperature: -25°C to +50°C

Built-In Protection

  • Residual Non-operating Current: 15mA
  • Rated Max. operating Current: 30mA
  • Max tripping: ≤0.1s

Physical Properties

  • Cable Specification: H07RN-F 1.5mm² Industrial Grade Rubber Cable
  • Socket Material: PC/ABS
  • Weight: approx. 1900g

Safety & Care Advice

⚠ Some portable chargers can adjust charge rates, but we strongly recommend limiting charging to 10A, especially for overnight or extended use, to prevent overheating and damage to your charger, extension lead, or socket. The connected charger MUST NOT exceed the maximum allowable load: 13 Amps (13A), ~230 Volts A.C. (= approximately 3kW).

Users should assess all risks and consult their portable charger manufacturer’s guidelines before using our EV-compatible extension leads. We do not recommend blanket use due to varying manufacturer advice and specific charging scenarios. Ensuring compatibility is the responsibility of the user. Stella Charge accepts no liability for damage arising from extension lead use.

Always ensure that leads (including connected charging cables) are fully uncoiled before use, as coiled leads can become warm when used at high currents.

Never plug an EV extension lead into another extension lead.

Frequently Asked Questions

FAQs

How does the RCD protection device work?

The inline RCD (Residual Current Device) is a life-saving safety feature built into our extension leads. It constantly monitors the electric current flowing through the cable. If it detects even a tiny imbalance which usually indicates a dangerous leak or a potential electric shock, it cuts the power instantly to keep you safe. It is an active (non-latching type) safety unit, meaning it trips to 'OFF' whenever the power supply is interrupted, so you must press the RESET button each time you plug in.

Full operating instructions are supplied with the extension lead.

Should I set the charge rate on my portable charger beyond 10A?

No. Even if your charger allows for higher settings, it’s best to stick to 10A or lower. Our extension lead is compatible with standard UK 13A sockets, and although these may supply 13A for short periods, drawing the full 13A for extended periods can cause the connected plug (and/or socket) to overheat. To ensure your equipment and wall sockets stay safe and damage-free, please keep the setting to 10A maximum.

Can I plug this EV extension lead into another extension lead?

No. For safety reasons, never daisy-chain EV extension leads. Our 10m to 20m options offer ample range for most customers.

Do I need to check the fuse clips inside the plug?

Due to the relatively high current used by EVs, it is good practice to check the internal connections are tight once a year (ensure the device is unplugged first). However, you should regularly check the outside of the plug for any signs of heat damage or scorching. If the plug ever feels uncomfortably hot (rather than just warm), stop using it and please inspect the internal clips immediately.

Customer Reviews

  • Chris Gray, UK

    Excellent service, excellent communication and an excellent product. Swift responses to emails and was extremely helpful and knowledgeable, the item was delivered within a couple of days with no issues at all. I would highly recommend and will be a returning customer.

    via Trustpilot 

  • Marcus Smith, UK

    Product I chose was perfect and very well made. Packaged well and very fast delivery with excellent communication on the journey.

    via Trustpilot 

  • John Goldingay, UK

    Product is as discribed, brilliant customer service. Both product and company are fantastic.

    via Shop App 
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Delivery and Returns

Delivery

FREE UK Delivery (Tracked). Ships within 24 hours.
We do not use Evri (formerly Hermes) for any of our deliveries.

In The Box:

  • 1x Letterbox Extension Lead
  • 1x Drawstring Storage Rucksack
  • 1x User Guide

Returns

We have a 45-day return policy, which means you have 45 days from delivery to request a return, provided the item is in as-new, resaleable condition. For damaged or incorrect items, please let us know within 14 days of delivery. Product defects are covered under the specified warranty. Read our refund policy and warranty policy for details.