Posted 20 hours ago

Blue Sea Systems Class T Fuse Blocks

ZTS2023's avatar
Shared by
Joined in 2023

About this deal

Time-delay: A fuse in which the burnout action depends on the time it takes for the overcurrent heat to build up in the fuse and melt the fuse element. For some rotary cam switches, that was the case. Something like 40A 600VAC, 20A 24V DC, 1 amp or less at 600VDC. Please refer to NEC code Article 240 Overcurrent Protection when sizing the fuses for your application. Steel reinforcing springs supplied as standard provide low resistance connection and long-range reliability

Current limiting design greatly reduces damage to equipment caused by heating and magnetic effects of short circuit currents. This last point is where a class T fuse shines. A class T fuse has the ability to reliably break a extremely high ampere current. Much higher than MRBF or ANL fuses. It is my understanding that this is much more important with lithium batteries because of the low resistance, a lithium battery can pour so much current into a short. With lead acid battery banks, ANL, MRBF, and Class T fuses are all permitted for main battery protection by the ABYC (US marine code), but with lithium's much greater ability to supply current, a fuse with a very high AIC becomes much more useful (or even mandatory--i'm not sure about this). Interrupting rating: Interrupting rating is the current that a fuse, circuit breaker, or other electrical apparatus is able to interrupt without being destroyed or causing an electric arc with unacceptable duration. At the same time I know from experience that inverters don’t care if you use an external fuse or not and that Gopower is a reputable mfg and their equipment has internal fusing and will protect itself. And I know that the real use of the ‘catastrophic’ fuse is to protect the wiring. My wiring will be simple and short. 2 gauge battery cable. The battery and the inverter will be close together inside the living space. Skoolie. I’m much inclined to use a 300A MRBF fuse. That might clip my surge limit but I don’t expect to use that much power anyway. Alternatively Blue Sea makes a 400A ANL. That wouldn’t clip my surge and would still protect my wiring.


Extremely current limiting — Stops damaging short circuit current faster than any mechanical protective device. The only unsafe failures we had were off-brand el-cheapo car stereo type ANL fuses. As can be seen here the windows literally exploded out of the fuse when it tripped. I did not have a single unsafe failure of a Cooper Bussmann/Blue Sea Ignition Protected ANL fuse but I only blew about 10 of them. I suppose if you blew 100 you may have an unsafe failure on an LFP bank..

DC circuits, All general purpose circuits, Motors, Transformers, Solenoids, Fluorescent lighting, All system components with high in-rush currents Fast-Acting — Provides fast-acting overload protection to equipment such as variable speed drives, rectifiers and other equipment containing surge-sensitive components. NOTE: Class T fuses do not have an ignition protection rating. As near as I can tell, from speaking with Blue Sea Systems, as well as Cooper Bussmann, they have not been specifically tested for this. This only means that they’ve not been tested, not that they would necessarily be unsafe.One of the most important aspects of electrical wiring of photovoltaic systems is fusing. Fuses provide integral protection against overcurrents that could otherwise damage your valuable PV equipment. Furthermore, using an incorrect fuse can be extremely hazardous! For motor and general purpose circuits where space is not critical, we recommend POWR-PRO™ JTD_ID Indicator series, LLNRK/LLSRK series, or FLSR_ID Indicator series. Circuits having relatively low levels of available short circuit current, Industrial and commercial applications having frequent outages where a renewable type fuse is desired

The lithium jump starter is going to be made as small as possible, sufficient to deliver cold cranking amps. Maybe 600A into 8V for a 12V starter? So that might be 1800A into a short. I doubt it is 10's of thousands, but I haven't worked with lithium. If it could do 10's of thousands, I think a smaller cheaper battery would have been used, still able to turn the car engine over. Fused combination motor controllers to provide IEC Type 2 (“No Damage”) motor branch circuit short-circuit and ground fault protection, Motor control centers, Transformer protection, Protection for UL Listed series rated molded case circuit breaker panels, General purpose circuits — mains, feeders and branch circuits — especially when space is limited When sizing the fuse, the most common calculation method is to multiply the continuous load/feed current of a branch by 1.25, and use the closest rated fuse that is greater than your result. However, there are exceptions to this calculation method.Can you point to this standard? I have been trying to look into this recently, but the latest publicly available version of the ABYC E-11 is 2008 when LFP was in its infancy. They do not differentiate OCP based on battery type, only on battery bank size.

Asda Great Deal

Free UK shipping. 15 day free returns.
Community Updates
*So you can easily identify outgoing links on our site, we've marked them with an "*" symbol. Links on our site are monetised, but this never affects which deals get posted. Find more info in our FAQs and About Us page.
New Comment