SPD selection and coordination
SPD Calculator
Choose a starting surge protective device type for AC, DC, or PV systems based on exposure, installation point, and system earthing.
Open calculatorVIOX engineering tools
Low-voltage calculation tools for practical product selection.
Support panel builders, OEMs, distributors, and electrical engineers with quick reference checks for surge protection, circuit protection, cable sizing, motor control, and EV charging loads.
Engineering workflowLoad, protection, and cable check
Calculator library
Each tool includes a browser-based calculator, formula notes, assumptions, warnings, related calculators, and links to relevant VIOX product support.
Cable sizing, voltage drop, and entry planning
Voltage Drop Calculator
Estimate voltage drop by current, conductor length, material, cross-section, and phase system.
Open calculatorCable sizing, voltage drop, and entry planning
Cable Size Calculator
Find a reference conductor size from load current, sizing factor, conductor material, and installation severity.
Open calculatorBreaker sizing and protection checks
Circuit Breaker Size Calculator
Estimate a standard MCB or MCCB current rating from load power, voltage, phase, power factor, and sizing factor.
Open calculatorkW, kVA, amps, and phase conversions
kW, kVA and Amp Calculator
Convert between kW, kVA, and current for DC, single-phase AC, and three-phase AC systems.
Open calculatorkW, kVA, amps, and phase conversions
Three Phase Current Calculator
Calculate three-phase current from kW or kVA, line voltage, power factor, and efficiency.
Open calculatorMotor current and starter selection
Motor Current Calculator
Estimate motor full-load current and a starting overload relay setting range from motor power, voltage, efficiency, and power factor.
Open calculatorEV charger load planning
EV Charger Load Calculator
Estimate EV charger current and total distribution load from charger power, phase, quantity, and simultaneity.
Open calculatorCable sizing, voltage drop, and entry planning
Cable Gland Size Calculator
Find a starting metric cable gland thread size from cable outer diameter, cable type, and environment.
Open calculatorBusbar and enclosure planning
Busbar Current Rating Calculator
Estimate busbar current from width, thickness, material, current-density reference, and derating factor.
Open calculatorProduct-aligned categories
Organized around low-voltage panel and protection work.
SPD selection and coordination
Surge Protection Tools
Calculators for AC, DC, and PV surge protection selection workflows.
Breaker sizing and protection checksCircuit Protection Tools
Tools for estimating MCB, MCCB, RCBO, and load protection requirements.
Cable sizing, voltage drop, and entry planningCable and Wiring Tools
Practical calculators for conductor sizing, voltage drop, and cable gland selection.
Motor current and starter selectionMotor Control Tools
Tools for estimating motor full-load current and starter protection needs.
EV charger load planningEV Charging Tools
Calculators for EV charging current, simultaneity, and distribution planning.
kW, kVA, amps, and phase conversionsPower Conversion Tools
Quick electrical conversion calculators for low-voltage engineering work.
Busbar and enclosure planningPanel Design Tools
Reference tools for panel builders and low-voltage cabinet design tasks.
Factory selection support
ContactNeed a product recommendation after the calculation?
Send the result to VIOX for SPD, MCB, MCCB, RCBO, contactor, cable gland, busbar, and EV charging protection support.