NewElec’s KA, KB and KC relays provide overload, underload, single-phasing, unbalanced current, overvoltage, undervoltage and phase rotation protection for LV pump motors. They provide a single unit solution in pumping applications that traditionally would have used a combination of thermal overload, undercurrent and restart timers.
The electronic motor protection and control relays are housed in a small footprint DIN rail mount. Fixed thermal curves (Class 15 Cold – Class 5 Hot) with thermal pre-loading match the hot and cold stall times of the motor during operation. The KA relay is mains powered, auto-selecting a 400 V or 525 V supply, while the KB and KC relays require either a 110 V or 220 V AC auxiliary supply.
The relays are available in the range from 0,5 to 25 A directly through the current transformer module block. KA, KB and KC relays are also offered in the range from 50 to 200 A using external current transformers 50:5, 100:5 or 200:5 respectively. In addition, the KA, KB and KC relays provide voltage phase symmetry, latched LED trip indication and a user-selectable auto reset. Protection is provided against locked rotor and jam conditions.
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