MPI Power Packs


Portable Current Generator

Mobile MPI Power Pack

The Tri-Mag is a portable power pack with variable AC output and is ideal for performing pistol prod and encircling techniques - Due to the variable supply the Tri-Mag can be used for demagnetising too. The Tri-Mag can also be used in conjunction with fixed coils, split coils and ‘G’ clamp type prods. All cables use quick release DINSE connectors for increased inspection efficiency and the Tri-Mag is supplied fully calibrated and with the relevant paperwork. Energising foot pedals available.

Safety features such as a circuit breakers and a series of fuses are fitted as standard on the Tri-Mag to ensure that even inadvertent misuse will not put operators at risk. Johnson & Allen pride itself on high quality design and construction which is why the power transformers used in the Tri-Mag are wound, built and extensively tested in house before they are installed.

Typical Output

  • 4 turn 300mm diameter coil - Up to 800A
  • 4 Metre loop cable - Up to 1,300A
  • 175mm pistol prod spacing - Up to 1,200A

Product Data

Input Voltage 230V
Energising Modes AC
Meter Digital
Ammeter Range 0 to 1,500A
Weight 30Kg


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