Timeline for spec of a fuse holder
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 22, 2015 at 0:31 | comment | added | user80875 | Your understanding of the voltage and current ratings is correct. I will comment above on AC vs DC. | |
| Nov 21, 2015 at 21:00 | comment | added | MikeTeX | Thank you for answering me. I'm almost satisfied with the answer, but since English is not my native language, I just want to make sure that I've understood right: by the terms "fuses rated 10A and less rated 250V or less" do you mean "fuses rated at most 10A and at most 250V" ? Also, what does "AC" mean in this context: I've never seen that "AC" or "DC" appears in the spec of a fuse (I may be wrong, please correct me if this is false). | |
| Nov 21, 2015 at 20:50 | comment | added | user80875 | The holder is suitable for fuses rated 10A and less rated 250V AC or less and fuses rated 15A and less rated 125V AC or less. In addition, fuses are usually designed so that they won't fit in holders that are not suitable. You need to make sure the fuses fit properly. I have seen fuses that appear to fit, but can be seen to not fit properly because there is a similar holder that they are designed for. Also make sure both fuse an holder have the proper test agency mark for the part of the world where they are used. | |
| Nov 21, 2015 at 20:26 | comment | added | MikeTeX | Ok, but according to these explanations, how am I supposed to interpret the spec "10A/250V AC 15A/125V AC"? | |
| Nov 21, 2015 at 19:22 | comment | added | user80875 | The thickness and area of the metal part of the fuse holder, the area of contact with the fuse and the spring force that maintains the contact has some effect on the heat generated by the current. The heat generated determines the current at which the fuse element melts. That means that each fuse rating and fuse holder must be tested together as a matching pair. It is not a question of the fuse holder failing, but causing the fuse to not melt at the proper current. | |
| Nov 21, 2015 at 18:26 | comment | added | MikeTeX | Thank you for answering me. Regarding your first answer, are you saying that the fuse holder has, like fuses, a rupture voltage? if so, why does it depend on the current? Regarding your comment above, I don't understand how this relates to the cost of the testing. | |
| Nov 21, 2015 at 18:09 | comment | added | Andy aka | @MikeTeX fuses and fuseholders have to pass certain safety tests and it is unlikely (given the small number of applications at 250V and 15A) that this scenario justified expensive testing. | |
| Nov 21, 2015 at 18:02 | comment | added | MikeTeX | My question was not about fuses, but since you have spoken about them, I'm surprised by what you said: I always believed that the voltage rating of a fuse was only relative to the rupture voltage of the fuse, which is an essential characteristic that comes into play only after the fuse has burnt. Regarding your answer about fuse holders, I am not entirely satisfied with it since it does not explain why there are two ratings 10A/250V and 15A/125V (if the fuse is safe with a voltage of 250V, what has this to do with the current rating?) | |
| Nov 21, 2015 at 17:45 | history | answered | Andy aka | CC BY-SA 3.0 |