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Martindale PD440S
  • Martindale PD440S
  • Martindale PD440S
  • Martindale PD440S
  • Martindale PD440S

Martindale PD440S Proving Unit

Martindale approved distributor and service centre.

Includes: MG3 magnetic hanger, 6 x 1.5V AA alkaline batteries and instruction manual.

Tax excluded
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Safe electrical working requires the use of a voltage indicator that has been proven with a suitable proving device before and after use to ensure the instrument is working correctly in accordance with the Electricity at Work Regulations.

The Martindale PD440S is a direct replacement for the industry standard PD440. Its voltage output is matched to the VI13800, the MTL10 and MTL20 Drummond test lamps and all other 440V voltage indicators and testers.

In addition to all the benefits of the industry standard Martindale PD440 and PD690 proving units, the S models feature a tough overmoulded low profile case and come with an MG3 magnetic hanger (excluding kits). They are fast and easy to use, instantly supplying the test voltage for both high and low impedance voltage indicators, test lamps and meters.


Safely and simply proves the operation of voltage indicators and test lamps up to 440V.
Essential for implementing effective safe isolation procedures.
Tough overmoulded low profile design.
Long battery life with low battery indicator.
Includes MAG3 high strength magnetic hanger.
Colour coded for voltage output.

Martindale PD Comparison
PD690S PD440SX PD690SX
Maximum Voltage Output 690V AC 440V AC 690V AC.
LED Voltage Thresholds 690V 50V, 120V, 230V, 440V. 50V, 120V, 230V, 400V, 690V.
High Voltage LED Multiple. Multiple.
Low Battery LED
High/Low Z Compatible
CALCHECK Resistance Values
Colour Coded to Match Voltage Indicators
Suitable for Multimeters, voltage testers & Drummond test lamps. Multimeters, voltage testers & Drummond test lamps. Multimeters, voltage testers & Drummond test lamps.

Martindale PD440S Specifications
Output voltage 440 nominal.
Output frequency 50 Hz nominal.
Output loading See datasheet.
Temperature (Operating & Storage) -10°C to 40°C.
Humidity (Operating & Storage) max. 70% R.H.
Altitude up to 2000m.
Pollution Degree 2
Power 6 x 1.5 V, AA alkaline batteries (IEC LR6, NEDA 15A).
Dimensions 150 x 80 x 35 mm.
Weight 350g approx. with batteries.
Martindale PD440S warranty Two-years.


Martindale PD690SX Datasheet

PDF Specifications of the Martindale PDS & PDSX Proving Units.

Download (782.52k)

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