Dold Industries Ltd

11 Hamberts Rd. Blackall Ind. Estate
South Woodham Ferrers
GB-Essex, CM3 5UW
RN 9075

Fuse Monitor

RN 9075


Switching delay

Operating voltage

Approvals and Markings


  • 0066928
  • RN9075.11/61 3/N AC138-440/78-253V
The fuse monitors RL 9075 and RN 9075 of the varimeter series monitor up to 3 fuses. The... more

Product description

The fuse monitors RL 9075 and RN 9075 of the varimeter series monitor up to 3 fuses. The measurement is very simple and without extensive wiring, as no separate auxiliary supply is necessary. The fast detection of a defective fuse protects against expensive damages and the user has the benefit of high operational performance and availability of the plant.

Technical specifications

Measuring range max.: 3 AC 400 V
Standard measuring range: 3/N AC 400/230 V
Approvals: UL
1- / 3-phase: 1, 3
Output contacts: 1 C/O contact
Width: 52,5 mm
Enclosure design: Distribution board
Type: RN 9075


  • Increasing the availability of plants by early detection of blown fuses, that may cause damage if undetected
  • Fast detection of blown fuses also with disconnected load availability of your plant on request
  • Reliable detection of blown fuses inspite of:
    - asymmetric mains
    - harmonic content


  • According to IEC/EN 60255-1
  • To monitor fuses in single and 3-phase AC voltage systems with neutral
  • Adjustable operating voltages: 400 V / 230 V and 230 V / 130 V and 110 V / 64V
  • Undervoltage detection below 0.8 x UB
  • Fast detection of a blown fuse
  • No separate auxiliary necessary
  • Output: 1 changeover contact
  • De-energized on trip
  • Adjustable switching delay
  • Width:
    - RL 9075: 35 mm
    - RN 9075: 52.5 mm