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Home | Products | T&R Test Equipment | Secondary Current Injection |

T&R Test Equipment - Logo 50A-3PH 3-Phase Current Injection System - Overview

T&R Test Equipment is a market leader in the field of current injection equipment. The range includes secondary injection units with 50 Amp output capability up to 6000 Amps primary injection systems. All have true RMS metering, a flexible timing system, and an easy to understand user interface.

The 50A-3PH is a three-phase injection system providing commissioning and maintenance engineers with a flexible system for testing protective systems. It has an easy to understand panel layout and a simple user interface. The status of every function can be seen at a glance, and there are no complex menus to navigate.

An auxiliary metering input is provided and can measure voltage, current, frequency, and the phase between any of the current outputs and an external voltage or current.

The timing system is very flexible without compromising ease of use, allowing trip times, reset times and closure times to be quickly measured to a high degree of accuracy. Two independently isolated contact inputs are provided, and the timing system may also be used as a stand-alone timer.

50A-3PH 3-Phase Current Injection System

  • Clear and simple user interface.
  • Three-Phase current output.
  • 0 to 50 Amps per phase output current.
  • True-RMS digital metering.
  • Memory ammeter.
  • Multi-function timing system.
  • auxiliary metering input.
  • Large back-lit Liquid Crystal Display (LCD).
  • Thermal and over-current protection.
  • Compact and portable.
  • 220V 3-phase or 400V 3-phase.
  • 115V to 440V 3-wire supply with optional supply transformer.

The unit has a range of outputs allowing injection of currents as low as a few mA and as high as 50 Amps. Voltages up to 18 volts are available on the main outputs. Three true RMS metering ranges are provided, allowing the full scale of the meter and trip level to be set independently of the selected output. Industry standard safety connectors are used on all inputs and outputs for convenience, reliability and safety.

The 50A-3PH is comprehensively protected by overcurrent, duty cycle and thermal trips, and keeps the user fully informed of any trip condition. Auxiliary outputs and inputs are fuse protected. The 50A-3PH can be used to test many types of single and three phase secondary protection including:

  • Over and under current relays
  • IDMT relays
  • Auto-reclosers
  • Time delay relays
  • Earth fault relays
  • Miniature circuit breakers
  • Power relays
  • Tripping relays
  • Thermal relays

Ordering Information

T&R Test Instruments 50A-3PH-opt 1

3-Phase Current Injection System, supplied with:  Output Lead Set, Mains lead,
Spare fuse set, and Operating manual. (see included lead set description below)

T&R Test Instruments 50A-3PH-opt 2

3-Phase Current Injection System, supplied with:  Output Lead Set, Mains lead,
Spare fuse set, and Operating manual. (see included lead set description below)


Note: The 50A-3PH instrument is supplied with a lead set in a plastic case including 6 x 3 meter 4mm2 output leads terminated in 4mm plugs, 2 x 3 meter, 2 x o.5 meter 2.5mm2 auxiliary leads terminated in 4mm plugs.

Supply Requirements: The supply voltage requirements for the unit must be specified at the time of ordering. The unit is available for operation from either a 400 Volt 4-wire 3-phase supply or 220 Volt 3-wire 3-phase supply. The optional delta-star supply transformer allows the 400 volt unit to operate from other supply voltages.

Supply Option 1: 400 Volt -10% +14%, 50/60Hz, 3-phase, 1000VA
Supply Option 2: 220 Volt -6% +14%, 50/60Hz, 3-phase, 1000VA


Optional Accessories

T&R Test Instruments Delta-Star

Delta-Star Supply Transformer (for DVS3 spec see 50A-3PH Datasheet)


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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