This product features integrated and certified compressor protection to guarantee unit safety. Thermal overload devices (Klixons), circuit breakers (thermal over-current relays), and electromechanical devices (contactors) — if used exclusively for compressor protection or activation in the event of overpressure — are no longer required. This provides cost savings and reduces space requirements.
source https://www.achrnews.com/articles/140835-carel-industries-spa-speed-drives
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