• 0-1200A 3 Phase output.
  • Accurate true RMS digital metering.
  • All outputs fully isolated.
  • Multi-function 1ms resolution timing system.
  • Auxiliary AC output.
  • Thermal and over-current protection.
  • Maximum power output 13kVA

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

Product Data

The 1200A-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.

Each loading unit has two output taps to allow for a range of load impedance.  Each phase is isolated and can be configured to either give a maximum of 1200A at 3.5V or 600A at 7V. 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.

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 reclose 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.

The 1200A-3PH can be use to test many single and three phase devices 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

Main Output

The units have three independently controlled outputs, one for each phase. The output is switched on and off by illuminated pushbuttons, and the current is set using the three control knobs on the front panel. All ranges are continuously variable from zero.

Range Continuous 5 minutes 1 minute 20s
3.5V 350A 600A 1000A 1200A
7.0V 175V 300A 500A 600A

The above intermittent on-times must be followed by an off-time of 15 minutes, and are based on an ambient temperature of 25°C.

Digital Metering

The output on the 1200A-3PH is metered by a digital true RMS system with a memory ammeter. The currents for each phase are displayed simultaneously.

Range Resolution Trip current Accuracy
60.00A 0.01A 63A ±0.6% rdg+5d
500.0A 0.1A 525A ±0.6% rdg+5d
1200A 1A 1260A ±0.6% rdg+5d

An electronic current trip is automatically set to 105% of full scale of the selected metering range to protect the device under test.

The unit is must be supplied by a 400V±10% 50/60Hz 3 phase 1300VA Max.

Timing System

The timing system on the 1200A-3PH  is very flexible, allowing a wide range of protective devices to be timed.

Range 0-999.999s
Resolution 1ms
Accuracy 0.01% rdg +2d (all except current operated mode)
0.01% rdg +4d (current operated mode)

The contact circuit has an open circuit voltage of 24Vdc and a short circuit current of 20mA. The contacts may be connected to volt-free contacts or contacts connected to a DC voltage system (240Vdc maximum).

The following functions are provided:

Mode Timer Start Timer Stop
Internal Start Press ‘ON’ Contact 1
Single Contact Contact 1 Contact 1
Dual contact Contact 1 Contact 2
Current operated Current > 10% of range Current < 10% of range

The output is automatically switched off at the end of the test to safeguard the relay under test.

Protection and Safety

The 1200A-3PH is protected by electronic over current trips on the outputs, fuses on the contact input, the mains input and regulators. An earth terminal is provided for connection to a local earth.

The unit is designed to comply with BSEN61010, and is CE marked.

Supplied Accessories:

Operating manual
Spare fuse set
USB memory key
USB keyboard
Lead set case.
2 battery operated stair climbing trolleys with spare batteries and chargers.

1200A-3PH Lead Set specifications

The 1200A-3PH lead set includes the following items:
1 x 5m mains lead
1 x 5m power interconnection lead to connect control unit to master loading unit
2 x 1m power interconnecting leads to connect master to slave loading units
1 x 5m metering interconnecting lead to connect control unit to master loading unit
2 x 1m metering interconnecting leads to connect master loading unit to slave loading units
6 x 3m 95mmoutput leads terminated in M12  Crimps
1 x 5m 2 core timer lead terminated in 4mm plugs