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Martindale PD440S Proving Unit

Original price was: £116.00.Current price is: £98.60. Inc VAT: £118.32

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    Martindale PD440S Proving Unit

    The Martindale PD440S Proving Unit 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.

    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.

    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.

    It’s good practice to match the output voltage of the proving unit with the voltage range of the instrument to be proved. The new S and SX Series simplify matching devices as they are colour coded with Martindale voltage indicators.


    Output voltage440V nominal
    Output frequency50Hz nominal
    Output loadingSee datasheet
    Temperature (Operating & Storage)-10°C to 40°C
    Humidity (Operating & Storage)max. 70% R.H.
    Altitudeup to 2000m
    Pollution Degree2
    Power6 x 1.5V, AA alkaline batteries (IEC LR6, NEDA 15A)
    Dimensions150 x 80 x 35mm
    Weight350g approx. with batteries
    • 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 PD440S 440V Proving Unit
    • Martindale MG3 Magnetic Hanger
    • 6x 1.5V AA Alkaline Batteries
    • Instruction Manual