` PRM-4 Phase Sequence and Motor Rotation Tester


PRM-4 Phase Sequence and Motor Rotation Tester

Ensure electrical equipment is correctly and safely connected

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Phase sequence testing is crucial for many three-phase loads. Improperly connected motors can result in reverse rotation, which can damage the equipment powered by the motor. Ensure electrical equipment is correctly and safely connected with Amprobe's PRM-4 Phase Sequence and Motor Rotation Tester.

The PRM-4 comes with test leads (red, green, and blue), alligator clips (TL-PRM-4), one (1) 9 V battery, user's manual, and a soft vinyl case.



• Identifies 3-phase sequence and open phase check
• Motor shaft rotation indication protected by CAT III circuitry
• 3 phase to phase input voltage, 100 V AC to 600 V AC max
• Supplied with three CAT III rated color coded large alligator clips and test leads
• 45 Hz - 70 Hz frequency

General Specifications

Operating Environment

0°C - 40°C at < 80% RH


Single standard 9 V battery
NEDA 1604
JIS 006P
IEC 6F22

Battery Life

Approximately 200 hrs typical with carbon-zinc battery

Low Battery Indication

The BATT LED does not come ON when TEST button is pressed

Dimensions (H x W x D)

153 mm x 72 mm x 35 mm (6.02 in x 2.83 in x 1.37 in)


Approximately 218 g (7 oz) including battery.


Indoor use


2000 m (6561 ft.)

Overload Protection

600 V AC

Agency Approvals

CE, cCSAus


Conforms to EN61010-1:2001
CAT III 600V, Pollution degree 2, Class 2
CSA 22.2 -1010-1


Conforms to EN61326-1. This product complies with requirements of the following European Community Directives: 89/ 336/ EEC (Electromagnetic Compatibility) and 73/ 23/ EEC (Low Voltage) as amended by 93/ 68/ EEC (CE Marking). However, electrical noise or intense electromagnetic fields in the vicinity of the equipment may disturb the measurement circuit. Measuring instruments will also respond to unwanted signals that may be present within the measurement circuit. Users should exercise care and take appropriate precautions to avoid misleading results when making measurements in the presence of electronic interference.

Electrical Specifications

Phase Sequence

Input Voltage

3 phase to phase inputs 100 V AC to 600 V AC max.


45 Hz - 70 Hz

Operating Time

10 min ON maximum at 600 V AC
10 min OFF minimum at 600 V AC

3-Phase Load

Approx. 7 mA per phase of AC power source

Motor Rotation

Operating Time

10 min ON maximum
10 min OFF minimum.

Motor Rotation Tester Field

14 mA of 9 V battery

For complete specs please download the product datasheet under the “Resources" tab.