MPI Power Packs


Portable Current Generator

1500A Mobile MPI Power Pack

The Tri-Mag is a portable power pack capable of variable AC outputs which can be used for performing pistol prod and encircling techniques as well demagnetizing components.

Johnson & Allen can supply a range of accessories with the Tri-Mag including encircling cables, pistol prods, ‘G’ clamp prods, split coils and foot switches. All cables use quick release DINSE connectors for increased inspection efficiency.

Ideal for finding surface defects

The Tri-Mag is ideal for finding surface defects in large or heavy parts, in-service components or weld testing on-site. Supplied calibrated and with the relevant paperwork.

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.

Product Data

Energising Modes AC
Input Voltage 110V
Frequency 50Hz
Open Circuit Voltage 3.2V
Duty Cycle 3 seconds 'ON'
15 seconds 'OFF'
Weight 30 kg
Dimensions 560 x 270 x 230mm


AC Output

Input Current (typical)* 30 Amps @ 110V
14.2 Amps @ 230V
Input Current (max.)* 38 Amps @ 110V
22 Amps @ 230V

Output Current (typical)*

1000 Amps @ 110V
1000 Amps @ 230V
Output Current (max.)*

1200 Amps @ 110V
1500 Amps @ 230V


*All tests carried out using a 4m loop of cable (70mm diameter)

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