Question: Can self-recovery fuses be used in parallel?
Answer: Self-recovery fuses are not recommended to be used in parallel. Generally, fuses have different internal resistances and different flowing currents after being connected in parallel. Theoretically, the currents are evenly distributed. But in fact, some currents are very large and some currents are very small. When over-current strikes, it is easy for over-current to be damaged first, and then other damages.
Parallel use of self-recovery fuses is equivalent to enlarging the cross-sectional area of fuses, which means that the number of current-carrying amperes is increased, and there is a potential safety hazard. After they are connected in parallel, they cannot be blown at the same time, and the blowing time will be prolonged. The explosion-proof ability of the final blow is very high, and if glass tube fuses are used, they will generally explode.
There are many kinds of self-recovery fuses, which do not need to be connected in parallel. Parallel connection will increase the cost, so long as the appropriate fuse is elected.
