The installation of voltage control relays in the residential sector has become a common practice to protect electrical equipment from loss of neutral and from overvoltage and undervoltage.
On Instagram and YouTube, many of my colleagues report issues in this area after installing voltage control relays from Meandr and other manufacturers, which often fail, leading them to replace them, mostly with the same type, and the cycle repeats.
Video about defective Meandr products from one of my colleagues: .
Many are now puzzled about which manufacturer's equipment to use, although the answer has always been clear: it is best to use equipment from manufacturers like Siemens and Schneider Electric.
I want to share my experience and reliable solutions that I use in the residential sector.
Solution for a three-phase network
.
Parameters monitored by the relay:
Loss of neutral.
Overvoltage and undervoltage phase-phase.
Overvoltage and undervoltage phase-neutral.
Load switching through .
Switching the coil of the KEAZ PM-12 250 A contactor through .
Solution for a single-phase network
.
Parameters monitored by the relay: detection of overvoltage and undervoltage.
Load switching through .
I also want to highlight the silent operation of the Schneider Electric TeSys modular contactor.
This article is not an advertisement; I use Schneider Electric products because ABB has a lot of defects, while Siemens is significantly more expensive and has longer delivery times.
Source: habr.com
