Amprobe PRM-4 Phase Sequence and Motor Rotation Tester

(7 customer reviews)

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


SKU: 3239635 Category:


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.


General Specifications
Operating environment 0 °C to 40 °C at <80 % R.H.
Power Single standard 9 V battery
NEDA 1604
JIS 006P
IEC 6F22
Battery life Approximately 200 hours 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 x 2.83 x 1.37 in)
Weight Approximately 218 g (7 oz) including battery.
Environment Indoor use
Altitude 2000 m (6561 ft.)
Overload protection 600 V AC
Agency approvals CE, cCSAus
Safety Conforms to EN61010-1:2001
CAT III 600V, Pollution degree 2, Class 2
CSA 22.2 -1010-1
EMC 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
Function Range
Phase sequence
Input voltage 3 phase to phase inputs 100 V AC to 600 V AC max.
Frequency 45 to 70 Hz
Operating time 10 minutes ON maximum at 600 V AC
10 minutes OFF minimum at 600 V AC
3-Phase load Approx. 7 mA per phase of AC power source
Motor rotation
Operating time 10 minutes ON maximum
10 minutes OFF minimum.
Motor rotation tester field 14 mA of 9 V battery


What’s Included

  • PRM-4
  • Test leads (red, green, and blue)
  • Alligator clips (TL-PRM-4)
  • Soft vinyl case
  • 9 V Battery


Datasheet »
Product Manual »

7 reviews for Amprobe PRM-4 Phase Sequence and Motor Rotation Tester

  1. buckie0123

    This product is user friendly with fast results

    In an industrial environment three phase motors are predominant and having this phase sequence tester in my tool bag has made me more efficient at my job

    ✔ Yes, I recommend this product.

  2. cityashland

    work great

    we just got the amprobe phase sequence and motor rotation tester to test pump motors and has work great for us

    ✔ Yes, I recommend this product.

  3. wkw09

    first time’s a charm

    Great rotation meter.
    No more 50/50 chance of proper phase rotaion. Get it right the first time, every time!
    A must have for motor loads in which wrong rotation will cause equipment damage.
    Simple, precise, and long test leads are a plus.

    ✔ Yes, I recommend this product.

  4. rt207

    Must have tool to check phases

    This is a must have tool, very useful in checking phase sequence. These type items make it clear that the rotation is correct. Used often after storm restoration to check the service has been connected correctly for the air conditioners. The easy to use hook up of the leads makes for a sure and true connection and that phase or rotation is running in the correct direction.

    ✔ Yes, I recommend this product.

  5. Ohmslawuser

    Emergency Generator Must Have

    This tester will allow you to hook up your 3 phase generator or motor and know the rotation without having to turn the equipment on and guess. In the case of emergency generators matching your utility phasing, you need to know the rotation. Trust me.

    ✔ Yes, I recommend this product.

  6. gentech2

    Great tool!

    I got this used from a friend when I went into the power generation field. on mine the motor rotation tester has never worked, but I give it 4 stars for not failing meand a coworkers fluke did resulting in parallelling 2 generators with opposite rotations… This is a tool I would purchase new for myself if it ever needs to be replaced. I really love the phase sensing lights and the rotation light, lets me see I have power on all 3 phases and the rotation.

    ✔ Yes, I recommend this product.

  7. Lumpyrussaferd

    Easy to use

    When I bought this meter I was looking for a just a rotation meter. After seeing all of the features, I couldn’t pass it up! I’ve used it a few times, was completely user friendly and easy to figure out. Basically a plug n play console. I’d recommend this meter for Sure!

    ✔ Yes, I recommend this product.

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