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Mains RadioLINK Relay - Ei428

4.5 out of 5 stars
£65.35 inc VAT
£54.46 ex VAT
Product Overview

The Ei428 RadioLINK Relay Module is a device that switches a relay upon receipt of an alarm signal from a suitable Ei smoke/heat alarm. The electrically isolated contacts can be used for many applications such as signalling, turning on lights, etc. The Ei428 is designed to operate with all Ei radio-interlinked products (Ei168RC, Ei605 series, Ei407, Ei410 & Ei411, as well as the Ei3100 series)

  • Mains powered relay module
  • 5 year warranty
  • Wireless interconnect with up to 12 other units
  • RF range 150 metres (minimum) in free space
  • Green LED Mains Indicator Light
  • Uniquely coded to work with one system only
  • Low power cell warning in the event of a cell failure
  • Rechargeable Lithium Cell Back-up
  • Supplied complete with blank cover

The table below shows all the units that can interconnect with the EI428 relay.

Compatible Alarms

Model Number
Type of unit
Type of interconnection
Ei3100RF Ionisation Smoke Alarm Radio-interlinked
Ei3103RFU Heat Radio-interlinked
Ei3105RF Optical Smoke Alarm Radio-interlinked
Ei605TYCRF Optical Alarm Radio-interlinked
Ei603TYCRF Heat Alarm Radio-interlinked
Ei168RC/Ei141 Ionisation Smoke Alarm Radio-interlinked using the Ei168RC base
Ei168RC/Ei144 Heat Alarm Radio-interlinked using the Ei168RC base
Ei168RC/Ei146 Optical Smoke Alarm Radio-interlinked using the Ei168RC base
Ei168RC/Ei161RC Ionisation Alarm Radio-interlinked using the Ei168RC base
Ei168RC/Ei164RC Heat Alarm Radio-interlinked using the Ei168RC base
Ei168RC/Ei166RC Optical Alarm Radio-interlinked using the Ei168RC base
Ei168RC/Ei2110 Multi Sensor Smoke & Heat Alarm Radio-interlinked using the Ei168RC base
Technical Data
Product Code EI428
Brand EI Electronics
Dimensions (HxDia)


Weight 0.18kg
FAQs (1)
Q. How can I add an external siren to a Ei radio-frequency smoke alarm system?

Use a mains powered RF relay Ei428 to operate a main powered sounder ACY03. The RF relay is capable to pick up the signals of any RF smoke/heat alarm from Ei Electronics/Aico.

Pricing & Availability

Model Stock Price
Product Code: EI428 Stock Level:
11 in stock Expected dispatch: Today

£65.35 inc VAT

£54.46 ex VAT

Delivery Options

The following delivery options are available on this product.

Economy Delivery

£4.99 inc VAT - Orders will be delivered in 3-5 working days by Hermes

Express Delivery

£8.10 inc VAT - Orders will be delivered in 1-2 working days by DHL

Customer Reviews

2 customers have given this product an overall rating of 4.5 out of 5

Reviews by real customers

All of our product reviews are written by real customers that have purchased this product from us and are published without modification.

Rating: 4 / 5 Stars

Reviewed by:

Great product, easy to install.

Published on: 3rd November 2013

Rating: 5 / 5 Stars

Reviewed by:

Used this to link into the existing DSC alarm

Published on: 27th June 2012

Looking for more information?

If you have any questions or would like more information about this product you can ask one of our specialists.

Direct Telephone 01507 464181