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Blade fuse problems in caravans – they may burn or melt
by Collyn Rivers
Blade Fuse Problems
Blade fuse problems in caravans include fuses and fuse holders burning or melting. Fire risk is high because the fuses may continue to conduct. Ongoing current flow, however, may heat the fuse holder to burning point. This article by RV Books explains why and how to overcome the risk.
The blade fuse problems in caravans and motorhomes (and particularly boats and 4WDs used on beaches and camper trailers) are mostly caused by exposure or partial exposure to damp air, dirt and water. This corrodes the fuse holder and fuse contact surfaces.
Typical burnt blade fuse and holder. The fuse and fuse holder have melded into a solid lump. Pic: redarc.com.au
Blade fuse problems in caravans – fuse holder sizes
There are two main sizes of blade fuses and blade fuse holders. Most blade fuse problems in caravans arise if the smaller size fuses and fuse holders are used at currents greater than 15 amps. Some auto-electricians suggest 10 amps. All need protecting against damp or salty water, or atmospheres.
As can be seen, the larger size has substantially more contact area.
Blade fuse problems in caravans – quality issues
There can also be blade fuse problems in caravans with poor quality versions of the larger sizes fuses and holders. Some have next to no protection against even mild corrosion. This causes them to resist current flow, usually partially melting the holder but not necessarily the fuse. This results in a major risk of fire – especially if the wiring’s insulation is also burned. It may expose current-carrying copper that, then allows full battery current to flow – possibly to earth. This can and does cause fires.
Long term blade fuse problems in caravans are also indirectly caused by badly crimped cable lugs. The resultant poor contact eventually allows corrosion between the copper and the lug. Heat builds up, in turn heating up the blade fuse holder.
![Blade fuse problems in [cara_s] - they may burn or melt - rv books, Collyn Rivers, rv books for beginners, solar books, best rv books, rv repair books, solar success, caravan and motorhome electrics, solar that really works, The caravan and motorhome book, why caravans roll over, how to choose and buy an rv](https://rvbooks.com.au/wp-content/uploads/2023/12/crimp-lug-badly-made.jpg "Blade fuse problems in [cara_s] - they may burn or melt 3")
This cable is only barely in contact with the crimp lug. Pic: original source unknown
A correctly formed crimp creates a cold weld. To achieve this it is 100% essential to use a proper crimping tool (as shown). Never use pliers or plier-like cheap crimping tools. A good ratchet type crimping tool, as shown below, forms that cold weld (i.e. an inter-molecular bond).
![Blade fuse problems in [cara_s] - they may burn or melt - rv books, Collyn Rivers, rv books for beginners, solar books, best rv books, rv repair books, solar success, caravan and motorhome electrics, solar that really works, The caravan and motorhome book, why caravans roll over, how to choose and buy an rv](https://rvbooks.com.au/wp-content/uploads/2023/12/Crimping_tool_4_col_OK.jpg "Blade fuse problems in [cara_s] - they may burn or melt 4")
Use only a crimping tool like that shown: they are not cheap, but a badly crimped lug can set a caravan on fire! Pic: RV Books.
Blade fuse problems – the need for larger holders
Blade fuses. That most typically used is shown on the right. Use the Maxi version (left) for fuses of 10-15 amps and over.
The above fuses typically blow within 0.1-02 of a second at 600% of their rated value, and 1.0-2.0 seconds at 350% of their rated value. This is fine for protecting correctly specified cabling. Don’t, however, use any fuse that is higher rated than necessary.
Blade fuse problems in caravans – circuit breakers preferred
Ideally, replace high current blade fuse holders and fuse by manually re-settable dc circuit breakers. Those of totally reliable quality are stocked by marine electrical suppliers. Cheaper versions are available but are very temperature sensitive. This, in particular, is not an area to cut costs via eBay specials.
This a high-quality double pole dc circuit breaker. It protects both positive and negative cables. Pic: Carling Inc.
See also Circuit-Breakers-and-Fuses-in-RVs
Blade fuse problems in caravans – further information
Every aspect of RV electrics is covered in detail in my Caravan & Motorhome Electrics. Solar That Really Works is for cabins and RVs. Solar Success is for homes and properties. My other books are the Camper Trailer Book and the Caravan & Motorhome Book. For info more about the author Click on Bio.
Please post a LINK to this article on forums if you feel it would assist problems in this area.
Articles by Category
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- AGM batteries for caravans – they are still worth using
- Battery charging and battery chargers – how to do it properly
- Blade fuse problems in caravans – they may burn or melt
- Dc-dc charging – how to speed alternator charging
- Electrical converter problems in caravans – problems when used for free camping
- Electrical converters in RVs – they’re unsuitable for free-camping
- Fast battery charging from generators – cheap, effective and relatively simply
- Grid connect solar modules for RVs – here’s how you can use them
- Imported RV electrics
- Interconnecting batteries in parallel or series – here’s how and why
- Inverters for caravans – and motor homes too
- LiFePO4 jump starters really do work – they power other things too
- Lighting for caravans – it makes every sense to install LEDs
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- Make caravan fridges work as claimed – here’s how to do it
- Quietening caravan water pumps – easy and cheap to do
- RV Alternator Charging Problems
- RV Batteries
- RV electrical wiring – twin-wire or chassis return – here’s why twin-wire is usually better
- RV Fuel cells – great idea, but cost is too high
- RV supply cables – choices of current capacity and length
- Solar regulators with current shunts – how to fix misleading readings
- TV interference from LEDs – here’s what causes it
- Variable voltage alternator problems with caravans – how to fix
Batteries & Battery Charging
- 12 volts dc from 24 volts dc
- AGM batteries for caravans – they are still worth using
- Are Lithium-ion Batteries Worth Their Price – homes and properties
- Australian Battery Breakthrough
- Baghdad battery myth
- Battery capacity for home and property
- Battery capacity required for cabins and RVs
- Battery charging and battery chargers – how to do it properly
- Battery ventilation is vital – why take any risk?
- Best Batteries for Solar Power Storage
- Blade fuse problems in caravans – they may burn or melt
- Connecting caravan batteries – there’s no magic way of doing it!
- Dc-dc charging – how to speed alternator charging
- Electric and Hybrid Vehicles
- Electric Vehicle Batteries
- Electrical converter problems in caravans – problems when used for free camping
- Electrolysis corrosion in vehicles – how to find and fix it
- Fast battery charging from generators – cheap, effective and relatively simply
- Generator Battery Charging – Quickly and Deeply
- How long can lead acid batteries last
- How to tell caravan battery charge – energy monitoring explained
- Imported RV electrics
- Interconnecting batteries in parallel or series – here’s how and why
- Lead acid batteries for caravans – they are still a good buy
- LiFePO4 jump starters really do work – they power other things too
- Lighting for caravans – it makes every sense to install LEDs
- Lithium batteries for caravans
- Lithium battery rival
- Lithium battery safety in caravans – are they all the same?
- Lithium-iron batteries in RVs – they are safe to use
- RV Alternator Charging Problems
- RV Batteries
- RV electrical wiring – twin-wire or chassis return – here’s why twin-wire is usually better
- RV Fuel cells – great idea, but cost is too high
- Variable voltage alternator problems with caravans – how to fix
- What Peukert really meant – but is so often misunderstood
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- Caravan and tow vehicle dynamics
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- Caravan wheel placement
- Caravan Length and Stability
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- Fifth wheelers are safer – here’s why they are
- Gross Combined Mass Upgrades
- How caravan and tow vehicles interact
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- Mechanical sway-control has little value at speed
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- Need for a WDH – avoid using one if possible
- Overhung Caravan Hitches
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- Reducing caravan sway – here’s how to minimise the causes
- RV Accident Data (Australia)
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- Tow Vehicle/Caravan Weight Ratio Explained
- Towing Without a WDH – Weight Distributing Hitch
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- Warning for Potential Caravan Buyers – how to buy a caravan
- Weight Distribution Hitch limits cornering
- Weight distribution hitch setup – how much correction is needed
- Wheels falling off trailers – and how to stop it happening
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Cooling and Heating
- Caravan air conditioning – here’s how
- Caravan fridge problems – how to fix the most common faults
- Carbon Monoxide Poisoning
- Diesel heating in caravans and motorhomes – it’s easy, effective and safe
- Make caravan fridges work as claimed – here’s how to do it
- RV Fridge Basics
- Safe RV heating – use diesel or LP gas
General
- Caravan air conditioning – here’s how
- Caravan design need for change
- Caravan facts and opinions – the nonsense so often on caravan forums
- Caravan suspension – it is mostly misunderstood
- 10 Tips for RVing Around Australia
- All solar house – self-building an off-grid all solar house
- Are Lithium-ion Batteries Worth Their Price – homes and properties
- Australian RV Road Rules – Summary
- Baghdad battery myth
- Buy a New RV in 5 Steps
- Buying used caravans – what to check
- Choosing a Caravan Tow Vehicle
- Choosing the right interior fittings for an Australian RV
- Convert to your own all solar home
- Driving across Africa – in 1956/60 the very last time it was possible
- Electric and Hybrid Vehicles
- Electric Vehicle History
- Electric Vehicle Home Charging
- Electric Vehicle Motors
- Electrolysis corrosion in vehicles – how to find and fix it
- Energy and Power
- Ensuring Successful Solar Projects
- Fuel savers do not work – almost all are scams
- Generators for Cabins and RVs
- Generators for Home and Property Systems
- Going off the grid
- Have portable solar in your rented home
- How much solar capacity do I need?
- How much solar energy available?
- How much solar input – here’s how to find out
- How to free camp legally in Australia
- How to stop paying for electricity
- Inverters for Homes and Properties
- Is a 4 wheel drive needed for motorhomes
- Is Napisan a Safe Toilet Chemical?
- Lightning risk in RVs – how to reduce that risk
- Living with solar – how make it all work
- Napisan and Look-Alikes safe for Septic Tanks – a professor’s view
- Our Solar Equipped RVs
- Overhung Caravan Hitches
- Problems with stand-alone solar – much applies also to RVs
- Quietening caravan water pumps – easy and cheap to do
- Retarding rust electronically – claims are exaggerated
- RV fault issues – who is responsible?
- RV forum common sense – a rare commodity?
- RV Layout – How to Choose the Best
- RV Solar and Alternator Charging
- RV Solar Basics
- RV Toilets – Which is Best?
- Safe toilet chemicals – can Napisan be used in septic tanks?
RV Solar
- Australian Battery Breakthrough
- Grid connect solar modules for RVs – here’s how you can use them
- How much solar input – here’s how to find out
- How to tell caravan battery charge – energy monitoring explained
- Lithium batteries for caravans
- Lithium battery safety in caravans – are they all the same?
- Our solar equipped RVs – all proved a major success
- Problems with stand-alone solar – much applies also to RVs
- RV Batteries
- Solar input available for caravans – know what’s available and increase it too
- Solar regulators with current shunts – how to fix misleading readings
Travel
- Caravan design need for change
- Caravan tare weight issues – some declared weights may not be correct
- Caravan wheel placement
- Caravan Length and Stability
- Caravan Tow Ball Weight – how much
- 10 Tips for RVing Around Australia
- Australian Road Rules Confuse
- Australian RV and towing rules and regulations – a general guide
- Australian RV Road Rules – Summary
- Best Way to RV Around Australia
- Buy a New RV in 5 Steps
- Choosing a Caravan Tow Vehicle
- Choosing the right interior fittings for an Australian RV
- Claims for dual-cab ute towing capacity mislead caravan buyers
- Do Not Trust Caravan Declared Mass
- Driving across Africa – in 1956/60 the very last time it was possible
- Electrical converters in RVs – they’re unsuitable for free-camping
- Free camp safely in Australia – this article shows how
- How to free camp legally in Australia
- How to Reverse a Caravan
- Is a 4 wheel drive needed for motorhomes
- Loading a Caravan Safely
- Microwave for RV oven power draw – it’s more than many users think
- Motorhome and trailer tyres
- Need for a WDH – avoid using one if possible
- Overhung Caravan Hitches
- Quietening caravan water pumps – easy and cheap to do
- Reducing caravan sway – here’s how to minimise the causes
- Retarding rust electronically – claims are exaggerated
- RV forum common sense – a rare commodity?
- RV Fridge Basics
- RV Layout – How to Choose the Best
- RV Toilets – Which is Best?
- Safe toilet chemicals – can Napisan be used in septic tanks?
- Sleep apnoea machines for camping – correct choice is vital
- Solar input available for caravans – know what’s available and increase it too
- Top 10 Australian RV Apps
- TV interference from LEDs – here’s what causes it
- Weight Distribution Hitch limits cornering
- What off-road really means
Health & Safety
- Caravan Fuses and Circuit Breakers – how to know which to use
- Caravan nose weight – it’s vital for safe towing
- Caravan weight safe to tow – depends on what tows it
- 10 Tips for Safe Caravan Towing
- Battery ventilation is vital – why take any risk?
- Blade fuse problems in caravans – they may burn or melt
- Carbon Monoxide Poisoning
- Claims for dual-cab ute towing capacity mislead caravan buyers
- Diesel heating in caravans and motorhomes – it’s easy, effective and safe
- Fifth wheelers are safer – here’s why they are
- Free camp safely in Australia – this article shows how
- How to Reverse a Caravan
- Is Napisan a Safe Toilet Chemical?
- Lightning risk in RVs – how to reduce that risk
- LP Gas risk in caravans – deaths & brain damage still occurs
- Making stable caravans – here’s how and why to do it
- Mechanical sway-control has little value at speed
- Napisan and Look-Alikes safe for Septic Tanks – a professor’s view
- Overhung Caravan Hitches
- Overweight RVs – a police point of view
- RV Accident Data (Australia)
- RV Industry Changes Needed
- RV supply cables – choices of current capacity and length
- Safe RV heating – use diesel or LP gas
- Safe toilet chemicals – can Napisan be used in septic tanks?
- Sleep apnoea machines for camping – correct choice is vital
- Towing Without a WDH – Weight Distributing Hitch
- Using correct size cables for RVs is essential
Legal & Compliance
- Caravan and motorhome compliance
- Caravan design need for change
- Caravan tare weight issues – some declared weights may not be correct
- Australian Road Rules Confuse
- Australian RV and towing rules and regulations – a general guide
- Australian RV Road Rules – Summary
- Buying used caravans – what to check
- Gross Combined Mass Upgrades
- Imported RVs – there can be major problems re-registering private imports
- RV Compliance – Here’s how to know
- RV electrical work – Victorian exception
- RV fault issues – who is responsible?
- Tow Vehicle & Caravan Weight Definitions
The Camper Trailer Book
Electric Vehicles
Household Solar
- Ensuring Successful Solar Projects
- Refrigerators for Home and Property Solar
- Solar Regulators for Home and Property Systems
- Battery capacity for home and property
- Best Batteries for Solar Power Storage
- Going off the grid
- Vital things about solar in the USA
- TOP 10 SOLAR SCAMS
- Generators for Home and Property Systems
- Solar Modules for Homes and Properties
- Solar Shadowing – reducing the losses
- Grid connect solar problems – what vendors may not reveal
- Inverters for Homes and Properties
- How to stop paying for electricity
- Have portable solar in your rented home
- Convert to your own all solar home
- Fuel cells for homes and properties
- Upgrading solar system has unexpected traps
- Solar charge your electric car at home
Want to find out more? Our books cover all these topics and a lot more.
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Solar That Really Works! explains every detail of designing and installing solar in boats, camper trailers, caravans and motorhomes.
Caravan & Motorhome Electrics covers every aspect of designing, installing and fault finding of the electrics in fifth wheel and conventional caravans, camper trailers and motorhomes.
The Caravan & Motorhome Book covers every conceivable aspect of camper trailer, caravan and fifth wheel caravan, campervan and motorhome usage.
Caravans and their tow vehicles rarely jack-knife and roll over – but when they do the results are catastrophic. The cause, and how to prevent it, is explained here. Why Caravans Roll Over offers solid advice for keeping yourself safe on the road.
learn more
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Between 1959 and 1961 Collyn Rivers and Antony Fleming drove a Bedford QLR off-road truck twice the length and breadth of Africa studying road surface conditions.
A 43 minute film about their adventure, produced and narrated by Antony Fleming, has been viewed on YouTube more than 1.6 million times!
To view the film, and also read Collyn’s telling of the tale, just click the button below.
Whether you’re buying your first RV or updating to a bigger, more comfortable rig, there are a great many things you need to know and consider. This book breaks things down so that you can decide what you want and whether or not what you’ve found is right for you. It’s technically sound and comprehensive so that you can proceed with complete confidence. How to Choose and Buy an RV is the ultimate guide for those times when you want to, well, choose and buy an RV.
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Caravan & Motorhome Electrics is the totally rewritten successor to the original globally selling Motorhome Electrics. The book’s content now also covers every aspect of designing, installing and fault finding of the electrics in fifth wheel and conventional caravans, camper trailers and motorhomes.
Solar Success explains how to design and build home and property systems that ensures affordable solar success first and every time.
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Solar That Really Works! explains, in clear English, every detail of designing and installing solar in boats, camper trailers, caravans and motorhomes. It is up-to-date, valid globally and technically accurate. It is clear, concise and easy to follow without sacrificing important detail.
This is Collyn Rivers’ newest book. Building on his years of experience and extensive knowledge of engineering and all things caravan and RV, this is the book you need with you when shopping for an RV.
Collyn Rivers has done it again! – if you need to know anything about motorhome electrics, then this book is for you… Collyn must be, without doubt, the foremost authority in Australia on this subject.
Why Caravans Roll Over….and How to Prevent It
Should be compulsory reading for everyone involved with Caravans: Design / Engineering, Marketing, Journalism (print & electronic), Regulations, Inspections, Driver-Training, Caravan Clubs, Towing and Modifications.
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Without doubt, this is the best book we have ever read . . . it will be treasured, and read on a regular basis.