Posted on 3/19/2021
Rating of Backup Breaker for SPD
Quite often, customer will ask, which rating of MCB or RCDs to be chosen to protect the surge protective devices (SPD)?
The answer is simple: we do not know.
The fact is that different MCB has different tripping force, different designed tripping mechanism has different moving contact and static contact and their arc running systems are also different.
Some 20A MCB ...