I am putting together a design for a custom Electrical panel. The panel consists of mainly DC powered components (Sensors, Controllers). Components are to be mechanically positioned using a DIN rail.

Operating voltage of the DC circuit is 24V, and components in the circuit have maximum current ratings ranging from 1A to 3A

Adequate and proper protection is a major requirement in this project. Digging around for circuit breakers, i realized that the more common AC circuit breakers out there (In my geographic location) are not recommended to be used in DC circuits.

Further digging also revealed that these DC Circuit breakers are about 2 to 3 times the cost of their AC counterparts which is bummer as this has affected my projected costing.

Alternatives i read about include the use of fuses. This has its advantages and disadvantages too.

My question is, in my scenario what is the industry recommended way of providing protection in DC circuits.

  • 1
    \$\begingroup\$ DC breakers are more expensive as it is harder to 'break' a DC current than an AC current. (In case of e.g. arcing the arc will stop when the current is zero, which will be the case for an AC current as it crosses 0A each time when it changes polarity). \$\endgroup\$
    – Huisman
    Aug 17 '19 at 12:12
  • \$\begingroup\$ Is all the 24V inside the panel, or does some power remote sensors? \$\endgroup\$
    – Mattman944
    Aug 17 '19 at 13:15
  • \$\begingroup\$ 1A to 3A is very small current, you can use electronic protection. shop.osd-schenck.de/epages/es549793.sf/de_DE/?ObjectPath=/Shops/… \$\endgroup\$ Aug 17 '19 at 13:22
  • \$\begingroup\$ Maybe if you watch the video, you will get the basic idea about the purpose (I think you are looking exactly for some similar solution) : youtube.com/watch?v=3pEPTliTL8M \$\endgroup\$ Aug 17 '19 at 13:33
  • \$\begingroup\$ @Mattman944 Sensors are outside of the panel but have their power and communication cables routed into the panel \$\endgroup\$
    – Cerezo
    Aug 17 '19 at 14:23

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