PMDsigma relays monitors voltage, current, temperature, and phase sequence. They enable users to set values via rotary knob and save them to chip card. Data remains flexible and can be copied to other units. Model PMD s10 monitors true power of motors with rating up to 11 kW, and can process frequencies from 0–1,000 Hz. With relays, users can implement early warning system for hazardous plant conditions.