Ei128RBU Relay Base

The Ei128RBU 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 Interconnect
  • 1 Volt free contact output (NO/NC)
  •  Continuous or pulse mode
  • Tamper proof rechargeable lithium battery back up

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The Ei128RBU Relay switches upon receipt of an alarm signal from a suitable Ei Alarm. 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 Ei128RBU is designed to be used with mains powered Alarms. It can either be installed underneath an easifit base or it can be sited remotely using the cover provided for electrical safety.

The Ei128RBU Relay base must be interconnected via hardwire even if it is a single Alarm installation.

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.


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
Continuous or pulse mode
Interconnection:via Hardwire
System size:Up to 12 devices
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: 182g
Product + Packaging: 212g
Warranty5 years

Product Manual

Product Datasheet