9-32 VDC Battery Guards

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10 business days (Austria), 12 business days (Europe), 15 business days (others)
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9-32 VDC Solid State Battery Guards

Please select from the above options:

  • 10 A
  • 20 A
  • 40 A
  • 60 A
  • 100 A
  • 200 A
Timed Version:
  • Yes
  • No

Product Description:

The Battery Guard is a solid state battery device that will monitor the source voltage and disconnect the equipment from the battery if the voltage falls below a pre-determined level. This can work to ensure that there is always sufficient voltage remaining in the battery to start a vehicle engine or ensure power is available for other critical applications. The total discharge of a lead acid battery can also cause damage to the cells significantly shortening the life of the battery.
The unit can also be set to disconnect equipment at a lower voltage that will still protect the battery from total discharge, while allowing for maximum battery usage. A timed version is also available which will disconnect automatically a set period after the ignition has been switched off.


There are six units in the range from 10A to 200A. The 10A and 20A unit offer a simple inline system, usually wired to a specific piece of equipment. These units do not require chassis mounting and simply connect and tie wrap neatly within the wiring system. The 40A and 60A units are connected by M6 brass bolts, the 100A and 200A by M10 brass bolts and use a three point mounting system to avoid rocking or stress to the electronics when mounted on uneven surfaces. Heat is dissipated into the custom manufactured die cast casting and all units will operate at full power without additional heat sink dissipation.

Manual Shutdown facility:

From 40A upwards, the units have the facility to be manually shutdown either through the ignition or a dedicated switch. In addition, from 100A upwards the units can have an override switch fitted. This allows the units to be reactivated for four minutes to allow emergency actions to be performed.

Alarm and Disconnect delay feature:

An alarm output is supplied which, once the threshold has been reached for 10 seconds, will activate, sounding an alarm or other indicating device for a further 50 seconds prior to disconnection. This allows the operator to restart the engine or take other action to maintain continuous power.

Timed Versions:

In addition to the standard units, we offer timed facility versions. This will disconnect the output after a set time after the ignition has been turned off. If required, during this time period, the voltage can still be monitored and disconnected if it falls below a set level to protect the battery power and system. The unit will reactivate when the ignition has been turned on again and the battery voltage has reached 8.5Vdc (12V systems), 17Vdc (24V systems).

Fully programmable:

All units in the range are supplied pre-programmed for a variety of scenarios offering higher or lower disconnect voltages and it is quick and simple to select the correct program to suit your needs.

Technical Data:

Input voltage range

9-32 VDC (Automatic Referencing)

Output voltage

Equal to input voltage when operating (maximum of 100 mV drop across terminals)

Transient over current rating (% of continuous value)

110% for 10s
200% for 1s
300% for <0,5 ms
On over current shutdown there is a retry every 30 s

Quiescent current when shutdown (while running)

Typ 2 mA @ 13.6V, (PT40/60 Typ 4 mA @ 13,6V), (PT100/200 Typ 6 mA @ 13,6V)


>400Vrms between input, output and case

Transient voltage protection

Meets ISO7637-2 International standard for 24V vehicles

Electrostatic voltage protection

Meets ISO10605, ISO14982, >8kV contact, 15kV discharge

Operating temperature

-25 °C to +60 °C to meet this specification table

Storage temperature

-25 °C to +100 °C

Ingress protection



Silver anodised aluminium, glass filled polycarbonate


PT10/20 Insulated 6.3mm push-on flat blade connectors
PT40/60 M6 ring tongues
PT100/200 M10 ring tongues
6.3mm push-in flat blade connectors for earth, switch, override and alarm
Programming lead with 2,8 mm blade connector provided

Output indicator

Green LED for programming and output indication

Mounting method

PT10/20 tie wrap to wiring (supplied)
PT40/60/100/200 3off half inch No8 pozi pan head screws (supplied)

Safe area protection:
Over current
Over heat
Catastrophic protection

Limited by current sensing circuit
Limited by temperature sensing circuit
Protected by filters and rugged component selection
Set by external input fuse (set by application demands) and ground line fuse max 1A


2004/108/EC The general EMC directive
Regulation 10 The automotive directive
93/68/EEC The CE marking directive

Designed to

EN50498, ISO 7637-2


CE and E marked

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