AMR PEMCO’s GM-300 Ground Check system is intended for use on all high voltage systems where a pilot wire is available.  Ground Check systems using the GM-300 are suitable for applications on power systems up to 25kVAC including low and medium voltages.  For power systems over 25kV, contact us for recommendations.

  • Test Switch included
  • Versatile sensitivity adjustment
  • Long life LED indicator lights
  • Low and high resistance indications
  • Simple troubleshooting
  • Reduced nuisance trips
  • Field replacement boards
  • Plug-in relay
  • Optional mechanical trip indicator
  • Operating window width of 3 ohms
  • MSHA approval #041890AMR
Dimensions:7″W x 9.5″H x 6″D
(177.8mm x 241.3 x 152.4)
Enclosure Rating:NEMA 4X, Powder Coated Aluminum
Weight:6 lbs (2.7kg)
Installation:Front Instrument Panel Mount
Operating Voltage:120 VAC
Current Consumption:750 mA
Operating Temperature: -20 to 70C
Humidity:0 to 90% R.H.
Phase Voltage Filters:7.2 kV, 15 kV, or 25 kV
Sensitivity:3 ohms
Trip Resistance:+/-1.5 ohms
Trip Delay:No
Pilot Voltage:12 VDC
Outputs:(1) Normally open or Normally Closed Contact Relay-250VAC @ 10 A
Display:LED indicators
Backup Battery:OPTIONAL - Rechargeable 12VDC, 12 Ahr
Test Feature:Yes
Option:Blocking Inductor-prevents parallel earth pass of signal
Warranty:90 Days

Head Office

PO Box 234
12187 N Scenic Highway
Rocky Gap, VA 24366

T:  +1-800-541-5583
F:  +1-276-928-1815

Hours of operation:
Monday - Friday
8:00AM - 4:30PM EST

Bluefield Facility

1960 Valley Dale Street
Bluefield, VA 24605-9454

GPS > 700 Fincastle Tnpk

T:  +1-800-428-7800
P:  +1-276-326-2611

Hours of operation:
Monday - Friday
8:00AM - 5:00PM EST

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