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Tech Data
Parts List
Parts List
CI-50 current interrupter


  • Interruption of C.P. rectifiers

  • D.C.V.G.
    Pipe to Soil Potential

  • Instant OFF

  • Other potential readings



Model: CI-50

50 Amp Current Interrupter

The new Model CI-50 has numerous improvements over previous versions, such as:

  • MIL-SPEC locking Instrument Enclosure

  • Tan color reduces heat and blends with surroundings

  • (4) AA's replaces 12v lantern type from previous model

  • Locking style port connection

  • Hold setting in memory


  • In-case storage of cables

  • Cables with Locking cable connector

  • From 00.1 to 99.9 Seconds ON or OFF Settings

  • Large, Easy to Read LED Display

  • External Connections

  • Locking Lead Connection

  • Large Clamps

  • In Case Storage

  • MIL-SPEC Lockable Case

  • Battery Operated


  • Model CI-50 Instrument in tan case

  • (4) AA Batteries (installed)

  • Cable, 6’ length with clamps

  • Instructions Manual

  • Warranty Card

Tinker & Rasor re-introduces the Model CI-50 50 Amp Current Interrupter.The new Model CI-50 is the perfect companion for the CP Tech with isolated trouble. This product is easy to use, and programs quickly in the field. The instrument offers a a wide range of cycle times and has many new and innovative features not found anywhere else. The instrument represents the latest in electronics in the industry, with a new design and numerous improvements.


The Panel layout is easy to operate and gives the user quick information.

Battery access is easy and a Low Battery LED light is included on the panel.


Super Bright blue circuit LEDs indicate Open or Close condition when in operation.

Large LED display is easy to read, even in direct sunlight.


The CI-50 has been recreated with all new components and circuitry. Integrated buttons, new processor chip and timing chips are all of the latest technology available today.


The CI-50 comes with a cable. One, locking connector fits into the side of the case and the other end includes two clamps. This connection is not polarity dependent.


Other new features include the inside case storage area. This area will hold all the cables that come included with the instrument and any other items you want to store here. Very convenient, as it can be secured by locking the case with the lid closed. The case can also be locked so that the lid can be opened.


The CI-50, like all other Tinker & Rasor equipment, is available from stock and ready to ship worldwide.



  • Maximum Current:50 Amps

  • Maximum Voltage: 120 Volts

  • Maximum Wattage: 6000 Watt

  • ON (Closed) Cycles: 0.1 sec to 99.9 sec (Programmable)

  • OFF (Open) Cycles: 0.1 sec to 99.9 sec (Programmable)

  • Battery Size: AA size

  • Battery Type: Alkaline

  • Battery Volts: (4) 1.5v AA

  • Cable Size: 10 AWG (6.0 mm2)

  • Cable Type: Stranded copper, PVC jacketed (Black)

  • Cable Length: 6’ (1.83m)

  • Cable Clamp: (2) Copper, 75A rated, 0.75” (19 mm) Jaw Opening, 3.00” (76.2 mm) length

  • Case Dimension: 9.25" x 7.12" x 4.12" (23.5 x 18.1 x 10.5 cm)

  • Case Type: Tough, thermo-resin plastic (Pelican® type)

  • Case Info: Closing and locking lid, with carrying handle 

  • Weight: 4 lbs (1.81kg)

TECHNICAL APPENDIX A Important Note Regarding Rectifier Spikes:

Most rectifiers experience a voltage spike when opening and closing, due to a capacitance effect in the system that can be quite large and very fast. Depending upon the magnitude and duration of the spike, the CI-50, and most other current interrupters made today, can become significantly damaged.

It is recommended that an oscilloscope be connected to a rectifier and the rectifier be manually cycled to see what type of spike may be present, prior to using an interrupter.

This step becomes especially important when the DC output of the rectifier is ≥ 50% or of the maximum current the interrupter can handle. In the case of the Quasar, which is a 100 Amp max instrument, a rectifier with an output greater than 24 amps should be investigated with an oscilloscope.

The Magnitude and duration of the voltage spike is expressed in the graph below. The green area of the graph is 0 – 750 volts and 0 – 2 milliseconds (0.002s) of time. The red area shows higher voltages and longer durations which can damage the instrument.

If a rectifier is found to have a voltage spike in the red area of the graph, it is not suggested that the current interrupter be used if the current to be interrupted is greater than or equal to 50% of the max specified current of the instrument.



Parts & Accessories

  • #085-144 CI-50 Instrument 

  • #026-085 Cable, CI-50 

  • #010-002 Battery, "AA" CellsEach CI-50 Takes Six Each

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