24v DC fuse

[dodo41]

Hello to everyone. In 24V circuits, sensor, plc etc. I want a fuse that blows in cases of short circuit and high current, (not glass fuse), do you have a suggestion of rail type, short circuit and current protected (24v) fuses that I can put in the panel? It is not a problem for me if the fuse automatically switches on when the short circuit disappears.

 

[Lucien Nunes]

You say no to glass fuses, but what about them is unsuitable for your application? It doesn't sound like you need high breaking capacity but using a ceramic HRC cartridge gives you a mechanically more robust fuse. 5x20mm HRC cartridges in rail-mounted terminals are standard and reliable, available with three fusing characteristics and currents from 0.1 to 10A or more.

Is it in fact preferable in your application not to use conventional fuses but self-resetting PTC devices like Polyswitch?

 

[pc1966]

There is a lot of information missing such as current range, required fusing time, etc. As Lucian points out, you might be better with PTC "self-resetting" fuses if the current/time behaviour is acceptable.

Otherwise this will take common 5x20mm ceramic fuses for DIN rail mounting for up to 6.3A:

1SNK508410R0000 | Entrelec Grey SNK Fused DIN Rail Terminal, 12 AWG, 24 AWG, 1.5 (stranded) mm², 4 (solid) mm², 250 V | RS Components

uk.rs-online.com

And this will take 10x38mm fuses for up to 32A at 690V (but smallest is 0.5A in that size of fuse):

P1062705 / CMC101 | Mersen 32A Rail Mount Fuse Holder for 10 x 38mm Fuse, 1P, 690V ac | RS

uk.rs-online.com

For the common 5x20mm or 6.35x32mm fuses you get all sorts of panel mount fuse holders as well that just need a round hole (ideally with anti-rotation notch, etc).

 

[dodo41]

Sorry for the missing information. it needs to be activated in case of more short circuit. It can be 2 amps or higher. It would be better if the vending machine had insurance. Because I don't want to constantly change ceramic or glass fuses. Thank you.

 

[James]

A correctly rated fuse should last the lifetime of an appliance, never needing to be replaced.

Unless of course there is a fault within the appliance, in which case an engineer is required to fix the fault anyway.

 

[Andy-1960]

The problem here is that a fuse or circuit breaker will not be fast enough in a lot of cases. The inbuilt short circuit protection in most new 24v DC switch mode power supplies will shut down the power supply before the secondary protective device has had chance to operate. This can make fault finding difficult on larger systems
I have used intelligent protection modules for applications such as this and they are excellent. They have 2, 4 & 8 channel units with either fixed or adjustable current ratings.
Although a bit more costly, they do what it says on the tin!

MICO Classic Intelligent Power Distribution | Murrelektronik

MICO Classic is the intelligent power distribution module from Murrelektronik for 24 V DC applications.

www.murrelektronik.com

 

[Darkwood]

Depending on your application depends on your fusing needs here, are you trying to protect the PLC here?

A few tricks can limit load associated S/C damage, the simplest is to fit ultra rapid fusing options like semiconductor fuses which are designed to cut the power before sensitive electronic devices are damaged, other options or additions are spec'ing transistor type outputs on PLC's instead of relay switching these can be opto' triggered thus isolation of PLC electronics is given and any fault at worse will only damage the individual transistor and not the PLC in general, if your using devices that directly pass the current through like a safety relay then semiconductor fusing is a normal option to protect them.

I use 24dc for control so transistor outputs are ideal and protecting the 24v been switched with semiconductor fuses makes for a well protected system component wise if the load was to short out.