Hioki PD3129-10 Large Jaw Phase Detector


Key Features:

  • Large jaw clamps effortlessly clip onto wire insulation
  • Phase direction visually shown with green LED arrow
  • Rotating LED indicator displays the phase sequence for a 3-phase power supply
  • Simple operation. Intermittent beeps denote positive phase and a continuous tone indicates reverse phase
  • Magnetic base enables unit to be secured on a distribution panel
  • CAT III 1000V

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Hioki's PD3129-10 Phase Detector with Large Jaw Clips, detects the phase of electrical current flow within insulated wires without the use of metallic contact voltage clips. The PD3129-10 is crafted specifically for user safety and efficiency.


Phase detection (positive and negative)

Voltage detection method

Static induction

Voltage range

70 to 1000 V AC (50/60 Hz) (sine wave, continuous input)

Frequency range

45 Hz to 66 Hz

Object to be connected

7 mm (0.28 in) to 40 mm (1.57 in) of insulated wiring


Phase detection : Positive ; 4 LEDs lit in clockwise order and the buzzer sounds intermittently, green arrow lights up
Negative ; 4 LEDs lit in counterclockwise order and the buzzer sounds continuously

Battery check function

Power ON lamp: lights up (Power ON), blinks (Battery LOW)

Auto power off

Auto shut off if no activity is detected after power is turned ON for 15 minutes

Power supply

R6P (AA) manganese battery ×2, Continuous use: 70 hr

Dimensions and mass

70 mm (2.76 in)W × 75 mm (2.95 in)H × 30 mm (1.18 in)D, 240 g (8.5 oz), Cord length : 0.7 m (2.30 ft)


Carrying case ×1, Strap ×1, Spiral tube ×1, Instruction manual ×1, R6P (AA) manganese battery ×2

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