Class RK5 Slow Acting

Amp Range:

100mA - 600 Amps





Part # Amp Rating Voltage Diameter Length O/A
FLNR1/10 100mA 250V 14.3mm 50.8mm
FLNR3/8 125mA 250V 14.3mm 50.8mm
FLNR15/100 150mA 250V 14.3mm 50.8mm
FLNR2/10 200mA 250V 14.3mm 50.8mm
FLNR1/4 250mA 250V 14.3mm 50.8mm
FLNR3/10 300mA 250V 14.3mm 50.8mm
FLNR4/10 400mA 250V 14.3mm 50.8mm
FLNR1/2 500mA 250V 14.3mm 50.8mm
FLNR6/10 600mA 250V 14.3mm 50.8mm
FLNR8/10 800mA 250V 14.3mm 50.8mm
FLNR1 1A 250V 14.3mm 50.8mm
FLNR1-1/8 1.125A 250V 14.3mm 50.8mm
FLNR1-1/4 1.25A 250V 14.3mm 50.8mm
FLNR1-4/10 1.4A 250V 14.3mm 50.8mm
FLNR1-1/2 1.5A 250V 14.3mm 50.8mm
FLNR1-6/10 1.6A 250V 14.3mm 50.8mm
FLNR1-8/10 1.8A 250V 14.3mm 50.8mm
FLNR2 2A 250V 14.3mm 50.8mm
FLNR2-1/4 2.25A 250V 14.3mm 50.8mm
FLNR2-1/2 2.5A 250V 14.3mm 50.8mm
FLNR2-8/10 2.8A 250V 14.3mm 50.8mm
FLNR3 3A 250V 14.3mm 50.8mm
FLNR3-2/10 3.2A 250V 14.3mm 50.8mm
FLNR3-1/2 3.5A 250V 14.3mm 50.8mm
FLNR4 4A 250V 14.3mm 50.8mm
FLNR4-1/2 4.5A 250V 14.3mm 50.8mm
FLNR5 5A 250V 14.3mm 50.8mm
FLNR5-6/10 5.6A 250V 14.3mm 50.8mm
FLNR6 6A 250V 14.3mm 50.8mm
FLNR6-1/4 6.25A 250V 14.3mm 50.8mm
FLNR7 7A 250V 14.3mm 50.8mm
FLNR7-1/2 7.5A 250V 14.3mm 50.8mm
FLNR8 8A 250V 14.3mm 50.8mm
FLNR9 9A 250V 14.3mm 50.8mm
FLNR10 10A 250V 14.3mm 50.8mm
FLNR12 12A 250V 14.3mm 50.8mm
FLNR15 15A 250V 14.3mm 50.8mm
FLNR17-1/2 17.5A 250V 14.3mm 50.8mm
FLNR20 20A 250V 14.3mm 50.8mm
FLNR25 25A 250V 14.3mm 50.8mm
FLNR30 30A 250V 14.3mm 50.8mm
FLNR35 35A 250V 20.6mm 76.2mm
FLNR40 40A 250V 20.6mm 76.2mm
FLNR45 45A 250V 20.6mm 76.2mm
FLNR50 50A 250V 20.6mm 76.2mm
FLNR60 60A 250V 20.6mm 76.2mm
FLNR70 70A 250V 27mm 149.2mm (incl tags)
FLNR75 75A 250V 27mm 149.2mm (incl tags)
FLNR80 80A 250V 27mm 149.2mm (incl tags)
FLNR90 90A 250V 27mm 149.2mm (incl tags)
FLNR100 100A 250V 27mm 149.2mm (incl tags)
FLNR110 110A 250V 40.5mm 181mm (incl tags)
FLNR125 125A 250V 40.5mm 181mm (incl tags)
FLNR150 150A 250V 40.5mm 181mm (incl tags)
FLNR175 175A 250V 40.5mm 181mm (incl tags)
FLNR200 200A 250V 40.5mm 181mm (incl tags)
FLNR225 225A 250V 53.2mm 219.1mm (incl tags)
FLNR250 250A 250V 53.2mm 219.1mm (incl tags)
FLNR300 300A 250V 53.2mm 219.1mm (incl tags)
FLNR350 350A 250V 53.2mm 219.1mm (incl tags)
FLNR400 400A 250V 53.2mm 219.1mm (incl tags)
FLNR450 450A 250V 65.9mm 263.5mm (incl tags)
FLNR500 500A 250V 65.9mm 263.5mm (incl tags)
FLNR600 600A 250V 65.9mm 263.5mm (incl tags)

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Top FAQs

Fuseco's Office and Primary Warehouse are located at: 

Unit 4 / 1-7 Friars Road, 

Moorabbin Vic 3189 

Melbourne, Australia 

Postal Address: 

PO Box 1425 Moorabbin Vic 3189 Melbourne, Australia

We'd love to hear from you! At Fuseco, rather than publish generic prices, we prefer to give you an individual quote. This ensures that we provide you with the best possible pricing to meet your needs.

The quickest way to place an order is to give our customer service team a call or send us an email. We promise to respond within 4 hours or you get $100 off your next order, however we usually respond within 1-2 hours to email enquiries. So go ahead and speak to us, we'd love to help you with your needs.


  • $20 + GST
  • FIS (Free Into Store) for all orders over $100, excluding GST & freight (For account customers only)


  • POA (Price On Application)
  • FOT (Customer nominates own carrier and accepts all charges)

Additional fees may apply for remote areas.

Freight details

Fuseco can help! We provide a 24 hour 7 day a week service for customers who are experiencing a breakdown situation or need a fuse urgently after-hours or during the weekend.

To use this service, please call our after-hours number 0411 104 363 and one of our customer service team members will be available to assist you. Please note that an after-hours fee applies to this service.

Fuses shall be selected according to the following criteria. 

  • Maximum operational voltage – shall be equal or greater than the system operating voltage. 
  • Rated breaking capacity – shall be equal to or greater than the maximum fault current expected in the circuit downstream the fuse. 
  • Rated current – shall be equal to or greater than the continuous operating current of the circuit protected by the fuse. 
  • Breaking range – partial range or full range breaking capacity according to the type of protection required. 
  • Utilisation category – select according to the nature of equipment to be protected.

Fuses are in most cases marked with all the essential information required to select a replacement fuse or to enable you to select fuses for most common applications. Additional information, such as performance characteristics can be supplied by the fuse manufacturer. Standard markings are as follows:

  • Fuse standard, size and reference. This defines the operating performance and mechanical design of the fuse.
  • Voltage rating. Fuses may be operated up to the maximum voltage stated in the rating. Voltage ratings may be colour coded to reduce the risk of incorrect installation.
  • Current rating. This represents the value of the current that the fuse can carry continuously with out deterioration under specified conditions.
  • Rated breaking capacity. This is the maximum value of prospective current that a fuse is capable of breaking under standard conditions. In other words, the maximum amount of current that a fuse can tolerate without losing its physical integrity (physically breaking apart). Industrial fuses according to IEC 60269-2 have a minimum breaking capacity of A.C. 50kA and D.C 25kA respectively.
  • Breaking range and utilization category are indicated by letter codes. The first (lower case) letter indicates the breaking range, i.e. the range of prospective currents the fuse is able to break. The second (capital) letter indicates the utilization category, i.e. time-current characteristics for typical applications.
  • Fuse manufacturer or trademark.
  • Manufacturer’s product reference or part number, required for additional information on the fuse.

Additional markings may include:

  • Rated frequency if other than 50 or 60 Hz. 
  • Date of manufacture, useful to trace back product design changes.
  • Certification mark, asserting product quality by an independent certification body. 
  • Conformity mark, stating conformity to applicable national directives. 
  • Recycling mark, identifying responsible recycling organization. 

In most cases, people contact Fuseco when they need to replace an existing fuse that has blown. In such cases, it is paramount that either the identical fuse or an exact equivalent is provided. Care must be taken to make sure that the fuse provided is of the same utilisation category and has the same electrical performance of the original. If you need assistance with this, I welcome you to contact us and we would be very happy to assist you. Also, we provide many types of cross-reference charts on this website, wall charts and various tools that can assist you to identify equivalent fuse types.

Fuses are rated by current, voltage, breaking capacity (interrupt capability) and whether they are designed to operate on AC or DC circuits. The current rating of a fuse is the current that it can carry for indefinite time periods without opening. The voltage rating relates to the ability of the fuse to function and extinguish internal arcs when it opens. The breaking capacity is how large a short-circuit or fault current the fuse can interrupt or stop safely without allowing a continuing arc and without damaging the fuse body or fuse holder.

Michael, you asked me if I was happy with your service. Let me tell you that Fuseco had quoted and delivered the products via airfreight from Germany before our other suppliers returned our call. Outstanding!

Peter Stremski


It’s been a pleasure working with Fuseco on this project. Initially, we thought that the power quality issues on this job were insurmountable. Fuseco conducted a power quality site audit and consulted with us to find a suitable solution that would work reliably in this challenging environment. The reactors and harmonic filters specified & supplied by Fuseco have been the perfect solution.

Peter Carney


Just wanted to say thank you again to the Fuseco team. When presented with an electrical harmonics problem of this nature, I wasn’t sure how to approach it. You guys explained it in logical, scientific terms and expertly demonstrated the capability of your technology. It is now one month post-installation and I can say that the Active Filter is working well and the harmonics levels on this site are now negligible.

John Ulverstone


I would like to acknowledge the exceptional service provided by one of your employees over the Xmas break. On Christmas day we lost a 22kV underground feed to a very important part of our business and were desperate for some replacement HV fuses. I found your emergency contact details on the web a and immediately called. The person who answered was very helpful and arranged an emergency transport to our site. The next day, we were back up and running! We are a remote operation 1800kms from the nearest city and average service is the norm.

Gregory Blair


Thanks for ensuring that our order was delivered on time. Again, thank you for going the extra 8,000 km!

Don Hajdu


I just wanted to let you know what great service your people gave us over the Christmas break and went to great lengths to make sure that we got the right fuses and that they were delivered on time. Dealing with your company a pleasure. Keep up the good work.

Kerry Prasad


I don’t normally do this but I feel compelled to thank you in writing. I have been in the electrical industry for 25 years and without a doubt the most competent and trustworthy supplier I have used over this period of time is Fuseco. This is a demanding industry and how your team keeps performing above expectations is exceptional to me.

Ross Adam


I have dealt with Fuseco for the last 6 years for all our fuse requirements and find they provide the highest quality service and on-going support to our business for our day to day operations and for emergency/ heatwave as they arise. During a heatwave event in January 2014, SA Power Networks had critical fuse demands. Fuseco were extremely responsive in expediting stock requirements and organising special air freights to meet our urgent demands. Their customer service is excellent and key KPI’s measured against the contract are always above target.

Peter Ashenden


Any company that can pull a rabbit out of a hat like that definitely has my attention!

Dane Branham


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