Master Relay
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User’s Manual
1
Description
The Master Relay is a battery isolator that goes much further than just safety in mind. It has
been designed with the sole purpose of a motorsport environment. Utilising solid state
switching components, the Master Relay has excellent temperature resistance, as well as an
aluminium enclosure that is lightweight and robust in even the harshest motorsport
environment.
The Master Relay not only has built in engine shutdown functionality in accordance to FIA
regulations, it also incorporates alternator load dump protection unavailable on most rival
devices. This helps to avoid nasty voltage spikes often seen when disconnecting the battery
source whilst the alternator is still charging.
The device can safely shut down the vehicle under a number of different events including:
external kill switch press, over current / short circuit, over temperature, and can even be shut
down via a remote CAN message. For example, in the event of a severe impact or an
overturned.
When connected to a data logger on a CAN bus, the Master Relay provides valuable
information about the current, voltage and internal temperature, as well as diagnostic
information that makes finding problems a lot easier. As well as transmission to a data logger
the Master Relay has a multi-coloured LED that shows a unique colour combination for each
of the 10 different states. The driver switch can also be connected with an LED to show when
the battery is isolated.
Safety Precautions
These instructions provide vital information to the safe and desired installation of the Master
Relay. Please ensure you are familiar with the entire process before installing this device into
your car. Failure to comply with these instructions could damage the Master Relay or other
components in the vehicle.
The Master Relay must be completely disconnected before any welding is conducted on the
installed vehicle.
The Master Relay should always have the PDM output connected and correctly shutting the
engine down. Failure to do so could damage not only the Master Relay but also other
computers connected in the vehicle such as ECUs, displays, control units etc.
While all efforts are made to ensure the accuracy of the information in this manual, no
responsibility will be taken for the consequences of any omissions in this manual.
