Ei428 RadioLINK Relay

The Ei428 triggers external devices as its relay activates when it receives an alarm signal from a compatible Ei Electronics device. 

  • 230V AC power supply with rechargeable lithium battery back up
  • Hardwire & Wireless Interconnect
  • 1 Volt free contact output (NO/NC)
  •  Continuous or pulse mode
  • Visual RF transmission indicator
  • Unique house coding feature
  • Tamper proof rechargeable lithium battery back up
  • Low power battery indicator

Compliant with Radio Equipment Directive 2014/53/EU

Categories: , Tag:

The Ei428 Relay switches upon receipt of an alarm signal from a compatible Ei devices. The electrically isolated contacts can be used for many applications such as signaling, turning on lights, strobes etc.

It is powered by 230VAC mains and has a rechargeable battery backup. The battery backup provides power supply for up to 2 months in case of mains failure.

The Ei428 relay is primarily designed to work with RF devices, but for additional flexibility it can also be used with hard wired interconnect systems.

It uses advanced radio transceiver technology with unique software coding to transmit and receive the RadioLINK RF protocol. This ensures a robust “mesh” of RF signals and reliable paths of communication. The house coding feature confines the RF communication to designated devices only, thereby avoiding the inadvertent activation of neighbouring alarm RF systems

As supplied the relay operates continuously but can be easily adjusted to pulse condition. In continuous mode, the relay switches until it receives an alarm cancel signal. In pulse mode, the relay switches for 5 seconds only.

The Ei428 has built in circuitry to aid suppression of voltage transients and RF interference.

Unlike a smoke detector, the relay does not need to detect smoke and is therefore quite flexible in terms of positioning. However, it is convenient to place it near the device it is controlling as well as its power supply.

Important: Ei Electronics devices are not designed to fulfil the role of a critical component of a BS5839-1 system’s requirements such as sound pressure level in a property, or to form a necessary component of an evacuation or other life safety procedure.

Product Life:10 years
Supply Voltage:230VAC
Battery back-up:Rechargeable Lithium battery back-up (non-replaceable) (provides up to 2 months power supply in case of power failure)
Contact Rating:250VAC, 5A resistive
RF Frequency:868MHz band (1% duty Cycle)
RF Power:+5dBm
RF Range:> 100 Metres in free air
Protocol type:Mesh architecture
RF Protocol:RadioLINK
System size:Up to 12 RF devices
Visual indicators:2 colour LED:
Green - Power
Flashing Red - depleted battery
Red & Green alternating: house code mode
Normal Operating and Storage Temperature Range:-10°C to 40°C
Normal Operating and Storage Humidity Range:15 % to 95 % Relative Humidity
Plastic material:UL94VO Flame retardant
Fixings:Screw fixing and cover supplied
Product: 141mm x 26mm
Packaged: 145mm x 30mm x 145mm
Product only: 180g
Product + Packaging: 210g
Warranty5 years

Product Manual

Product Datasheet