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5 Photovoltaics,Batteries, Cable and Wire 7 48 volt D.C. fluorescent lights 8 Low Voltage DC Lights Glossary of Alternative Energy Terms CHARGE CONTROLLERS 36 Solar Converters Special Solar and Battery Charging Equipment 37 TriMetric Battery System Monitors and Deltec Co. shunts 38 Timers,Linear Current Boosters,Photoswitch,Voltage Controlled Switches 39 Battery Desulphator by Solar Converters, Inc. 42 QuickCable links to instock products 48 DC Fuses, Holders & Fuse Blocks 56 Electric Vehicle and Alternative Energy Battery Disconnects 57 Thin-Lite Special Order replacement ballasts 58 Cable and Butt Splices & Connectors BATTERY POST & TERMINAL CONNECTIONS, ADAPTERS AND BATTERY ACCESSORIES 62 Heat Shrink Tubing & Cable Lugs by QuickCable 67 Anderson SB Connectors 72 Iota Engineering Battery Chargers / Converters 73 SAE Connectors, Plugs, Sockets & Cords 75 DC to DC Voltage Converters & Dimmers by Solar Converters 76 Universal Generator Starter switch by Solar Converters 79 open page 81 TriMetric 2030 and SC-2030 Wiring Layout
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For questions or to order by phone please call:
You can easily order by phone.
All of the circuit breakers we sell are DC rated.
Please order what you need, we have no minimum requirements
44 DC Fuse & Circuit Breaker Types & Installation
Basically there are two types of direct current fuses and
The first provides Overcurrent Protection.
This type of protection is placed near the load (e.g. inverter, light, fan, pump)
and will break the circuit when the load draws more amperage
than the load is designed for.
An overcurrent protection device is meant to protect the load,
not the system or batteries.
Often the overcurrent fuse or circuit breaker will have a built-in
surge rating which allows it to handle more than the name plate
rating while a motor or other load starts up.
The delay can be up to ten seconds in some cases.
As an example, a 100 amp time delay fuse (Class R) may be able
to handle two or three hundred amps for up to ten seconds
before it blows.
Some circuit breakers have a 25% over name plate rating
for up to two seconds (this is called the time-delay curve in
some circuit breaker specification sheets).
In either case, a dead short-circuit will blow the fuse or trip
the circuit breaker, immediately.
The second type provides Short Circuit Protection (catastrophic).
This type of protection is placed near the battery(s).
It is designed to protect the battery(s) from a short circuit
in the system which could cause the batteries to over-heat or
in some cases, start a fire or explode.
In the grand scheme of things, batteries do not store much energy.
But in a dead short they can liberate a tremendous amount
of enegy in a few seconds.
The ability of a fuse or circuit breaker to clear a short-circuit
is rated as the Arc Interrupt Rating and given in amps.
This is where a protection device is needed that will break, also known
as clear or extinguish, a high amperage arc.
Some heavy d.c. rated circuit breakers are rated to interrupt an arc
up to 10,000 amps.
Class T fuses are usually rated at 20,000 amps in d.c. applications.
A good guide is to use the highest A.I.R. fuse or circuit breaker in
Always use a direct current rated fuse or circuit breaker
in a direct current system.
It is more difficult to clear a short-ciruit in a d.c. system than in
an a.c. system.
In an a.c. system the current is changing directions sixty times a
second, 120 times a second there is no current flowing.
In a d.c. system the current is going in the same direction all of
Always use a fuse or circuit breaker that has the same or
higher voltage rating as your system.
The higher the voltage, the more difficult it is to clear a short circuit
arc in the device.
A Class T fuse will usually have a d.c. voltage rating of 125 v.d.c.
or 160 v.d.c.
It is not recommended to use a d.c. circuit breaker that has a very
high voltage in a low voltage d.c. system.
A battery system of 12 to 48 volts works fine with a circuit breaker
rated up to 160 volt d.c.
Occasionally you will see large molded case d.c. circuit breakers
with a d.c. voltage of 500 volts or more offered for sale.
These are usually magnetic circuit breakers and require a high-voltage
direct current to create a powerful magnetic field to trip the circuit breaker.
A problem and danger with using one of these circuit breakers on a
low voltage d.c. system is that in a short circuit situation it can take
so long to build up the magnetic field that damage can be done to the
system before the circuit breaker can clear the short, if ever.
When wiring a circuit breaker, attach the input (from the battery
bank) to the input connection marked on the circuit breaker.
A d.c. rated circuit breaker is designed internally to interrupt an
arc by pulling the contacts apart, and in some cases by
additionally physically blocking the arc.
There is a reason they have an input or line connection marked.
To be continued.
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1 Site Search - Quick Index | 2 The Realities of Purchasing On-Line | 3 Why Do Business With Us? | 4 Distributor of IOTA Engineering, Quick Cable and Thin-Lite products | 5 Photovoltaics,Batteries, Cable and Wire | 6 Lumen Outputs of Compact Fluorescent and Incandescent Lights | 7 48 volt D.C. fluorescent lights | 8 Low Voltage DC Lights | 9 Low Voltage DC Lighting | 10 Thin-Lite Emergency Survival Disaster LED lights | 11 DC Compact Fluorescent Screw-in Ballasts & Tubes | 12 DC Compact Fluorescent Screw-in One Piece Lights | 13 Balanced Battery Charging and Dis-Charging by IOTA | 14 Portable & Emergency Fluorescent Light by Flexcharge | 15 DC Fluorescent Inverter Ballasts by IOTA Engineering and Montana Light | 16 Charge Controller Musings | 17 Bogart Engineering SC-2030 Solar Charge Controller | 18 PV Solar charge controllers with night lighting load by Flexcharge | 19 Thinlite Indoor Fluorescent Lights | 19 A - LED Lighting by Thin-Lite | 20 Thinlite Outdoor Lights | 21 Thinlite Replacement Ballasts | 22 Thinlite Replacement Lens - Diffusers | 23 Thinlite DC Lighting Products | 24 DC Lighting | Glossary of Alternative Energy Terms | 25 Parallel and Series Battery Bank Information | 26 What we sell and why. | 27 Amps Volts and Watts | CHARGE CONTROLLERS | 28 Emergency and Disaster Preparedness Notes | 29 Photovoltaic Module & System Wiring - Setting Up A PV System | 30 Wind - Hydro - Solar Charge Controllers by Flexcharge | 31 Water and Air Heating Diversion Loads for Charge Controllers | 32 Maximum Power Point Tracking Solar Charge Controllers by Solar Converters | 33 Solar Converters, Inc. Charge & Lighting Controllers | 34 SES Flexcharge Solar Single or Dual Battery Charge Controllers | 35 Thin-Lite ballast replacement installation guide | 36 Solar Converters Special Solar and Battery Charging Equipment | 37 TriMetric Battery System Monitors and Deltec Co. shunts | 38 Timers,Linear Current Boosters,Photoswitch,Voltage Controlled Switches | 39 Battery Desulphator by Solar Converters, Inc. | 40 Solar Converters, Inc. Products | 41 SES Flexcharge Products | 42 QuickCable links to instock products | 43 Thin-Lite products we stock | 44 DC Fuse & Circuit Breaker Types & Installation | 45 Switches - DC rated wall switches | 46 IOTA Engineering IQ4 Smart Charge Controller Owners Manual | 47 Our own alternative energy systems | 48 DC Fuses, Holders & Fuse Blocks | 49 Class T- DC Fuses & Fuse Blocks | 50 ANN - ANL - CNL DC Fuses & Fuse Blocks | 51 Inverter Cable and Overcurrent Protection Guide | 52 Installation and trouble shooting low voltage d.c. lighting | 53 Diodes - Blocking & Bypass, What do they do? | 54 Low Voltage D.C. Lighting Tips | 55 Your On-Line Privacy | 56 Electric Vehicle and Alternative Energy Battery Disconnects | 57 Thin-Lite Special Order replacement ballasts | 58 Cable and Butt Splices & Connectors | BATTERY POST & TERMINAL CONNECTIONS, ADAPTERS AND BATTERY ACCESSORIES | 59 Battery Post Marine Conversions & Terminal Extensions | 60 Battery Post Connectors Conversions Adapters Repair | 61 Battery Terminal & Post - Cable Lug Covers & Protectors | 62 Heat Shrink Tubing & Cable Lugs by QuickCable | 63 Cable Lugs - Compression Connectors - No Crimping & No Soldering | 64 Heavy Duty Cast Copper Connectors - Lugs | 65 Cable Lugs - Copper Connectors - by Quick Cable - MAX | 66 Cable Lugs - Magna Lug Heavy Duty & Fusion by QuickCable | 67 Anderson SB Connectors | 68 Anderson SB Connector Accessories | 69 Anderson SB Connector Parts | 70 Thin-Lite LED and Fluorescent Comparisons | 71 Overview of Our Photovoltaic Systems | 72 Iota Engineering Battery Chargers / Converters | 73 SAE Connectors, Plugs, Sockets & Cords | 74 Electric Vehicle Power Supplies Converters by IOTA Engineering | 75 DC to DC Voltage Converters & Dimmers by Solar Converters | 76 Universal Generator Starter switch by Solar Converters | 77 Stranded vs Solid Wire in low voltage systems | 78 IOTA Engineering Power and Lighting products | 79 open page | 80 Wire & Cable Gauges and Information | 81 TriMetric 2030 and SC-2030 Wiring Layout | 82 DC to DC Voltage Converters | 83 TriMetric 2030 Battery Monitor Features | 84 IOTA Engineering DLS Battery Charger Features | 85 Lighting Systems | 86 Practical Alternative Energy Applications | 87 Portable and Emergency Power Systems | 88 Custom Cables | 89 Thin-Lite Special Order Fluorescent Models & Pricing | 90 Resources for Disaster & Emergency Preparedness | 91 Thin-Lite Special Order LED Light Models & Pricing | 93 | 94 Battery Wiring Diagrams | 95 Battery Condition and State of Charge Charts | 96 Order Form | 97 Backup Power? | 98 Energy Expectations | 99 Power Needs Worksheet | 100 Efficiency | 101 Wire Loss Chart | 102 Solar Insolation Map / Chart | 103 Utility Inter-tie | 104 About Us | 105 Statement of Policy & Warranty/Returns | Contact Us | MPPT Charge Controllers - FAQ | Battery Equalizer/DC Autotransformers - FAQ | Constant Voltage Pump Drivers - FAQ | Linear Current Boosters - FAQ | Information | 1 | 2 | 3 | 4 | 5 | 6 | 7 | NEWS-info links | Home Power Articles | R | P | A | B | C | D