Primary Current Injection Source APCI-600

Primary Current Injection Source APCI-600

The APCI-600 is a programmable AC high-current source designed specifically for utility-substation applications. This device is well suited for primary injection testing of protective relays. This versatile device can also be used for testing thermal, magnetic, and solid-state motor-protection relays and molded-case circuit-breakers, as well as any application that requires a high-current source.

Built-in Timer

The APCI-600’s built-in timer can test the time delay characteristics of protection relays and molded-case circuit-breakers. Once the test is initiated, the current source and the timer are automatically turned on at the next zero crossing point of the AC. The timer stops when the APCI-600 input detects a change in the dry contact or voltage input, or detects the removal of the test current. The test results are then displayed in milli-seconds and fractions of a cycle(s) on the unit’s back-lit LCD screen (20 characters by 4 lines).

External Current Input

The APCI-600 also has an external-current input (0 – 10 A). Both the internal current source amplitude and the external current source measurement readings can be viewed at the same time.

Current Source

Test currents, ranging from 100 to 600 amperes, can be set by using the rotary dial knob on the control panel. The test current is then measured, and the results are displayed on the LCD screen. When the APCI-600 is used as a current source, the current-on time (duration of current flow) is displayed on the LCD screen.

APCI-600 Output Current and Duration Table

output @ 120 Vac

output @ 240 Vac


5.6 Vac @ 100A

9.5 Vac @ 100A

1 hour

5.3 Vac @ 200A

9.4 Vac @ 200A

5 minutes

4.9 Vac @ 300A

9.0 Vac @ 300A

2 minutes

4.6 Vac @ 400A

8.2 Vac @ 400A

1 minutes

4.2 Vac @ 500A

7.5 Vac @ 500A

30 seconds

3.9 Vac @ 600A

7.0 Vac @ 600A

20 seconds

APCI-600’s Specifications


100 - 600 Amp current source

Physical specifications

17”W x 12½”H x 10½”D, (42.6 cm x 32 cm x 27 cm); Weight: 46 lbs (21 kg)

Input power

100 - 120 Vac or 200 - 240 Vac (factory pre-set), 50/60 Hz

Internal meter range

100 mA - 1000 A; Accuracy: 1% of reading, ±20 mA

Measuring method

Isolated CT

External meter range

10 mA - 10 A; Accuracy: 1% of reading, ±2 mA

Measuring method

Isolated CT

Timer reading range

1 ms - 2 hours; Accuracy: 0.1% of reading ±1 ms

Timer stop input

Voltage input (24 - 300 V, DC or peak AC), dry-contact input, or removal of primary current

Computer interface

RS-232C port (19,200 baud) for factory calibration and diagnostics


Designed to meet IEC61010 (1995), UL 61010A-1, CSA-C22.2 standards


Operating: -10°C to +50°C (+15°F to +122°F); Storage: -30°C to +70°C (-22°F to +158°F)


90% RH @ 40°C (104°F) non-condensing


2,000 m (6,562 ft) to full safety specifications

Included Accessories

10-foot #1/0 AWG test leads, power cord, ground cable

Optional accessories

Transportation case


1 year on parts and labor

NOTE: the above specifications are valid at nominal voltage and ambient temperature of +25°C (+77°F). Specifications are subject to change without notice

Connections Primary Current Injection Source APCI-600Controls Primary Current Injection Source APCI-600

Manual Primary Current Injector APCI Amperis , Amperis Slideshare

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