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Earth Fault Protection | AERL | EarthGuard Ground Fault Detection EG-300


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Subtotal: $651.00

AERL EarthGuard Ground Fault Detection - EG-300

Utilizing proprietary detection techniques, the AERL EarthGuard Insulation Monitoring Device simultaneously monitors the unearthed PV Array (60 - 300V) and Battery Storage System (48/120V) for conductor insulation degradation.

Installed on the battery bus, the EarthGuard monitoring device satisfies the earth fault detection requirements of both AS/NZS 5033:2014 & AS/NZS 5139:2019 with onboard audio/visual alarms and an alarm relay output for external fault indication.

Featuring support for full integration with AERL’s CoolMax SRX charge controller range, EarthGuard can be utilized in an integrated arrangement or as a standalone device for use with approved third-party controllers, power conversion equipment
and battery systems.


Weight 1.2 kg
Dimensions (L x W x H) 140 x 230 x 110 mm
Enclosure Type Indoor Type 1 / IP20
Operating Temperature -25 to 60°C
Storage Temperature -25 to 80°C
Connection Terminals Screwless Terminals (0.25 mm2 -> 5.25 mm2 )
Input Power (12V Input) 10 – 14 Vdc (12V Nominal)
Max Power Consumption (12V Input) 120mA
Input Power (5V Input – USB C) 4.5 – 5.5 Vdc (5V Nominal)
Max Power Consumption (5V Input) 290mA
Alarm Indication Relay Signal (Dry Contact)
PV Array Monitoring Range 60 – 300 Vdc
Supported Battery Voltages 48 Vdc | 120 Vdc
Input Load Under Test 0.5 Mohm
Input Load Not Under Test 300 Mohm
Leakage Trip Current (+/-10%) > 80uA | > 210uA
Isolation to Low Voltage Side 1000V (Transient)
Electrical Safety AS/NZS 3100:2017
EMC (Domestic) AS/NZS 61000.6.3:2012

Please see more details in the 'Data Sheets' tab.


All items subject to availability and will generally require a 4-6 week turnaround.

We don't hold the stock on hand but have a trusted supplier who will send this direct from their nearest warehouse to ensure you receive it as soon as possible.


Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure. AERL will bear the cost of parts and labour to repair any manufacturing faults found within the terms and period of this warranty. For claims under warranty, the faulty product(s) must be returned to AERL’s facility at 2/75 Bluestone Cct, Seventeen Mile Rocks, Brisbane, Australia after contacting AERL and receiving the appropriate RMA documentation from AERL. No allowance is made for labour or travelling time required to disconnect or reinstall faulty parts. AERL will pay the cost of freight to return the repaired charge controller to the customer within Australia or New Zealand only. Any faults or like faults caused by lightning, water or moisture ingress, vermin infestation, improper voltage, faulty installation, use of the product in a manner for which it is not intended, alterations which affect the reliability or performance of the unit but are not attributable to faulty manufacture, failure to act on service warning from the AERL charge controller, or damage caused by other system components will not be covered under warranty.

Register your warranty here

AERL Limited Warranty Policy

Data Sheets

Please see 

Data sheet here

Manual here

Warranty guide here

Do I need an EarthGuard? Here