• Product Description

    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.

    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.


    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

    Item Specification

    Output voltage 440V nominal
    Output frequency 50Hz 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 1.5V, AA alkaline batteries (IEC LR6, NEDA 15A)
    Dimensions 150 x 80 x 35mm
    Weight 350g approx. with batteries

    Additional Details

    Type Voltage Testers & Proving Units