Martindale FD550 Digital Fuse Finder
Martindale FD550 Digital Fuse Finder
Martindale FD550 Digital Fuse Finder

Martindale FD550 Digital Fuse Finder

£0.00 ex. VAT
£0.00 inc. VAT

Martindale FD550 Digital Fuse Finder

  • Simple tracing of fuses and breakers
  • Visual & audible indication
  • Fast manual mode
  • Self-adjusting auto mode
  • Mains powered plug-in transmitter
  • Dual function receiver & non-contact voltage indicator


The Elite Fuse Finder makes identifying poorly labelled fuses and breakers easy without the need to power down each circuit to identify the one you need to work on. Plug in the transmitter to a live 13A mains socket and then scan the board with the digital receiver to quickly identify the right breaker with audible and LED bargraph indication.

The receiver has both fast manual mode and auto threshold mode set by a single sweep over the board. The auto mode sets the sensitivity to ignore weaker signals which can be caused by coupling between circuits ensuring easy detection in a wide range of installations.

The receiver will work with multiple transmitters and can also be used as a non-contact voltage indicator.

Each Martindale FD550 fuse finder is supplied with a receiver, transmitter, batteries and instruction manual.



FD500 Transmitter
Voltage rating 230V
Frequency range 30-70Hz
Switching frequency 5Hz approx.
Transmission pulse width 1.7µS approx.
Transmission pulse 20A max
Earth leakage Nil
Power consumption 1W approx.
IP rating IP20
Supply from mains
Dimensions 65 x 65 x 50mm
Weight 65g approx.
FD650 Receiver
Tracing depth for fuse assignment 0-10cm approx. depending on local conditions
Sensitivity setting via digital stepping
IP rating IP20
Supply 9V battery, MN1604/PP3, IEC 6LA61 (alkaline only)
Weight 135g approx. (incl battery)
Dimensions 202 x 32 x 22mm
Complies with EMC standards

Transmitter: CAT III 300V

Receiver: CAT IV 600V

FD550 includes FD650/R receiver

FD500/T transmitter