AERL EarthGuard Fault Detectors Insulation Monitoring Device EG 300

Model Type: EarthGuard Fault Detectors (EG 300)
Sale price$650.00


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. 


  • 60 – 300V PV Monitoring Range
  • Supports 48V & 120V Batteries
  • One EarthGuard Per System 1
  • High Accuracy Detection
  • Audio & Visual Alarms
  • Alarm Indication Relay


General Specifications
Parameter Typical
Weight 1.2 kg
Dimensions (L x W x H) 140 x 230 x 110 mm
Enclosure Type -25 to 60°C
Enclosure Type Indoor Type 1 / IP20
Storage Temperature -25 to 80°C
Connection Terminals Screwless Terminals (0.25 mm2 -> 5.25 mm2 )
Low Voltage Side EG 300
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)
High Voltage Side EG 300
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)
Standards EG 300
Electrical Safety AS/NZS 3100:2017
EMC (Domestic) AS/NZS 61000.6.3:2012

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