Motor current, starting, contactors, voltage quality, and VFDs
Motor Current Calculator
Estimate motor full-load current and a starting overload relay setting range from motor power, voltage, efficiency, and power factor.
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Motors, Contactors & Drives
Motor current, starting, contactors, voltage quality, and VFDs
Motor current, starting, contactors, voltage quality, and VFDs
Motor Starter Selection Calculator
Estimate motor current, starting current, contactor duty, overload-relay range, and preliminary short-circuit protection for a motor starter.
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Three-Phase Voltage Unbalance Calculator
Calculate three-phase voltage unbalance, voltage-window thresholds, and select a starting LSP FCP18 monitoring-relay function.
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Insulation Resistance Temperature Correction Calculator
Correct a measured insulation-resistance value to a reference temperature using a selectable doubling-temperature or entered correction coefficient.
Open calculatorMotor current, starting, contactors, voltage quality, and VFDs
Motor Torque Calculator
Calculate motor shaft torque, output power, input power, angular speed, and lb-ft from kW or hp, rotational speed, and efficiency.
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Motor Control Panel Load Calculator
Estimate an MCC or motor-control-panel feeder ampacity from the largest motor, remaining motors, non-motor load, demand, and spare capacity.
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Contactor Selection Calculator (AC-1 / AC-3)
Estimate a contactor current class from load type, power, voltage, utilization category, and operating frequency.
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Motor Starting Voltage Drop Calculator
Estimate bus voltage dip during motor starting from motor current, starting method, transformer impedance, and feeder impedance.
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VFD Sizing, Protection and Panel Calculator
Estimate the minimum VFD output-current class and screen input protection, bypass contactor, filtering, braking, and panel heat requirements.
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Solid State Relay Selection & Heatsink Calculator
Calculate SSR load current, minimum nameplate-current screen, conduction loss, heatsink thermal resistance, junction temperature, surge margin, and semiconductor-fuse I²t checks.
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