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T&R Test Equipment - Logo 750ADMmk2 
Current Injection System - Overview

The 750ADM mk2 and the 750ADM-H mk2 are compact, rugged primary current injection systems with 750 Amp output capability. The 750ADM has a maximum no load output voltage of 3.5 Volts and the 750ADM-H has a maximum voltage of 5 Volts. The units are ideally suited to all low power primary injection tasks requiring up to 750 Amps for short periods.

Model 750ADMmk2 Current Injection System

  • Primary injection up to 750 Amps.
  • Output 2.8 Volts (Model 750ADM)
    Output 4 Volts (Model 750ADM-H)
  • Secondary injection Output: 16 Volts 40 Amps.
  • True RMS memory ammeter with single cycle capture.
  • Multi-function timing system.
  • Large back-lit Liquid Crystal Display (LCD)
  • Thermal and over-current protection.
  • Automatic switch-off at end of test.
  • Automatic mains voltage selector.
  • Compact and portable.

Where higher currents and powers are required for primary injection, 7kV and 20kV primary injection systems are available. The PCU1-SP and PCU2/E systems have separate control and loading units, allowing a wide range of load conditions to be covered with different loading units;

Unit Type

Maximum Power Rating

Maximum Current

Model 750ADM


750A, 30 sec (10 sec on 115V supply)

Model 750ADM-H


750A, 20 sec (10 sec on 115V supply)

Model PCU1-SP + NLU5000


5000A, 40 sec

Model PCU2/E + LU6000


6000A, 5 minutes


The 750ADM and 750ADM-H have two outputs, allowing injection of currents as low as a few hundred milliamps and up to 750 amps. Voltages up to 16 volts are available on the 40 amp output, allowing higher impedance trips to be tested. Four true RMS metering ranges are provided, allowing the full scale of the meter and trip level to be set independently of the selected output. The metering has a capture time of less than 20ms, allowing the RMS of a single cycle to be accurately measured. Industry standard connectors are used on all inputs and outputs for convenience, reliability and safety.

The 750ADM and 750ADM-H are comprehensively protected by electronic overcurrent and thermal trips.

The timing system is very flexible without compromising ease of use, allowing trip times, reset times, and reclose times to be quickly measured to a high degree of accuracy. Two contact inputs are provided, each of which may be triggered by a volt-free contact or a DC voltage. The contact inputs auto-sense for normally open or normally closed contacts.

The 750ADM can be used to test many devices including:

  • Circuit breakers
  • Primary injection of over-current relays
  • Auto-reclosers
  • MCB's
  • CT ratio (with external meter for secondary current)

Ordering Information

T&R Test Instruments 750ADM mk2

Primary Current Injection System - Includes Operating manual, mains lead, spare fuse set, carrying strap, and an aluminium carrying case.

T&R Test Instruments 750ADM-H mk2

Primary Current Injection System - Includes Operating manual, mains lead, spare fuse set, carrying strap, and an aluminium carrying case.


Optional Accessories

T&R Test Instruments ADMlog

Software (to log results from the 750ADM and transfer them to a spreadsheet)

T&R Test Instruments 750ADM-AL

Lead Set

T&R Test Instruments Pelicase

Carrying accessory, includes space for both instrument and test leads.


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Macey's Electrical Pty. Ltd.
ABN 17 344 601 468
Unit 1, 49 Gavenlock Road, Tuggerah, NSW Australia 2259
Phone: +61 2 4353 4644    Mobile: 0412 678 925