AVSPC10 12V 70 AMP
AVSPC20 24V 50 AMP

These units are ideally suited to 12V or 24V vehicles where “under bonnet” space is at a premium. They come complete with a 3M mounting pad.

It senses when the engine is running and allows the charge through to the auxiliary battery, when the engine is switched off it will monitor the voltage coming from the starting battery. When the voltage drops to 12.6V (AVSPC10) or 25.2V (AVSPC20) the unit will separate and isolate the batteries guaranteeing sufficient power in the starting battery to start the vehicle when the voltage has dropped to a predetermined level.

The unit now has a one minute timer built in to eliminate damaging relay chatter caused by a flat auxiliary battery putting too much strain on the unit.

12 Volt 70 Amp Voltage Controlled Relay

Operating Voltage Pin Config.
13.4V to 12.6V 1 + main (starting) battery
2 + auxiliary battery
3 - ground

24 Volt 50 Amp Voltage Controlled Relay

Operating Voltage Pin Config.
26.8V to 25.2V 1 + main (starting) battery
2 + auxiliary battery
3 - ground




AVSPC11 12V 70 AMP
AVSPC21 24V 50 AMP

Newly launched are the AVSPC11 and AVSPC21. These units are exactly the same specification as AVSPC10 and AVSPC20 however they have flying leads for earth and ignition.

These units do not rely on the switching voltages, instead they are activated when the ignition is on and they charge the auxiliary battery. When the ignition is switched off, the unit will separate and isolate the batteries.

12 Volt 70 Amp Ignition Controlled Relay

Operating Voltage Pin Config.
13.4V to 12.6V 1 + main (starting) battery
2 + auxiliary battery
3 - ground

24 Volt 50 Amp Ignition Controlled Relay

Operating Voltage Pin Config.
26.8V to 25.2V 1 + main (starting) battery
2 + auxiliary battery
3 - ground




AVSPC12 12V 200 AMP
AVSPC24 24V 100 AMP

How It Works
When the engine is running, the Charge Guard senses the voltage and allows the charge through to the auxiliary battery. When the engine is switched off, the Charge Guard monitors the voltage from the starting battery into the unit. When the voltage drops to 12.5V (AVSPC12) or 25.4V (AVSPC24) the unit will separate and isolate both batteries. This means that equipment powered form auxiliary batteries cannot drain the starting battery.

Why You Need One
With today’s engine management systems and “intelligent” alternators you cannot use the charging light on the dash as a switch, also you cannot jump start most new vehicles without the danger of damaging the engine ECU. This unit then becomes cost effective.

Who Uses Them
Emergency vehicles where battery drain is a problem. Utility and council vehicles where multiple beacons/work lamps or power tools are being charged.

The unit also has a one minute timer built in to eliminate damaging relay chatter cause by a flat auxiliary battery putting too much strain on the unit.

Technical specification

  AVSPC12 AVSPC24
Rating amps 200 A 100 A
Size 120 x 80 x 70 120 x 80 x 70
Studs size M8 M8
Quiescent current > 1 mA > 1 mA
Switching voltages 13.4V - 12.5V 27.0V - 25.4V




AVSPC12(2W) 12V 200 AMP
AVSPC24(2W) 24V 100 AMP

How It Works
When the ignition is switched on, the unit automatically allows the charging voltage to pass through from the starting battery to the auxiliary battery. This was designed specifically for vehicles with extra equipment that can drain an auxiliary battery quickly.

Why You Need One
With today’s engine management systems and “intelligent” alternators you cannot use the charging light on the dash as a switch, also you cannot jump start most new vehicles without the danger of damaging the engine ECU. This unit then becomes cost effective.

Who Uses Them
Emergency vehicles where battery drain is a problem. Utility and council vehicles where multiple beacons/work lamps or power tools are being charged.

Technical specification

  AVSPC12 AVSPC24
Rating amps 200 A 100 A
Size 120 x 80 x 70 120 x 80 x 70
Studs size M8 M8
Quiescent current > 1 mA > 1 mA
Switching voltages 13.4V - 12.5V 27.0V - 25.4V




AVSPC400A 12V 400 AMP

This unit is the latest in the range of Charge Guards. It is designed for vehicles where extra equipment is being fitted on upgrade, i.e. ambulances and emergency vehicles.

The AVSPC12 may have been adequate for original fitting but with the addition of upgraded equipment it is putting too much strain on the Charge Guard.

The 400 amp version can cope with virtually all split charging requirements.

It is ideally suited for vehicles such as breakdown vehicles where there is a high requirement for power to run tyre changing machinery.

The relay is a double latching relay which draws zero current in either mode.






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