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When power is applied, the green power LED comes on. When a motor start signal is applied to pin 3, the yellow LED comes on, showing that the 500VDC is being applied to the motor winding. If the winding is good, the AutoMeg completes the megging operation, and the motor start signal is then connected from pin 3 to pin 4.

If the winding is bad, the Low Meg Red LED comes on, and the motor start signal will not be available on pin 4 to engage the motor starter. To unlatch the Low Meg alarm contact, press the Motor reset pushbutton. The Low Meg Alarm contacts, pins 10 and 11, are a normally open relay contact that closes upon the Low Meg alarm condition.

A Meg test button is provided to verify that the unit will lock out under a Low Meg condition. An emergency bypass switch is provided to bypass the megging process. Placing this switch in the bypass mode disables the megging circuit, and engages the motor start relay circuit, pins 3 and 4.


1. A 1 Amp fuse is required at Pin 9 to protect the leakage circuit.
2. Use Isolation contactor when using AutoMeg with Soft Starts and VFD�s.
3. Periodically press the Meg Test pushbutton to ensure that the unit displays the Low Meg LED indication, and that the motor run contact is disabled.
4. Automeg units require the use of an SD12-PC Socket


Input Power: 120VAC, 50-60Hz, 5.9VA (Pins 1,2)
Internal DC Voltage: 500VDC
Relay Contact Rating: 3A Normal, 30A Inrush, 360VA Pilot Duty
Motor Run Relay: SPST (Pins 3,4)
Low Meg Alarm Relay: SPST (Pins 10,11)
Operating Temperature: -20 to +60 �C
Storage Temperature: -45 to +85 �C
Case: Polycarbonate
Base: Rhynite


Electric Motor Winding Insulation Monitor
UL FILE # E138380

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  •  Automeg, Inc.  •  12626 Double Run Ranch  •  Astatula, Florida 34705  •  
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