Automatic three-phase voltage regulator KEMOT PROavr-30k 30 kVA 400 V

Automatic three-phase voltage regulator KEMOT PROavr-30k 30kVA 400V is designed to stabilise mains voltage and protect connected equipment by maintaining a stable 230 V output in single-phase operation and balanced voltages in three-phase mode. The device uses a toroidal transformer and servo-controlled regulation to correct both undervoltages and overvoltages and deliver a precise output with up to ±3% accuracy. It includes phase monitoring, overload and short-circuit protection, thermal protection and configurable start-up delay.

Advantages

The KEMOT PROavr-30k provides automatic voltage regulation with high output accuracy thanks to servo motor technology and a toroidal transformer design. It supports independent single-phase operation as well as three-phase balancing, and it isolates a faulty phase to prevent damage, indicating issues with a PHASE ERROR indicator. Additional features include a bypass switch for direct mains supply, adjustable DELAY switch-on delay (6–180 seconds) to protect against high inrush currents, and protections against over- and under-voltage, overload, overheating and short-circuit. Four sturdy wheels facilitate transport and placement.

Suitable for

• Household appliances: induction hobs, microwave ovens, refrigerators and freezers
• Home and office AV equipment: TVs, speakers, mini-towers and audio/video devices
• Computers and office devices: PCs, monitors, printers, cash registers
• Heating systems: central heating stoves and pump units
• Electrical generators and other power sources requiring stabilisation

Key specifications

• Model: KEMOT PROavr-30k (MPN URZ3437-30)
• Power rating: 30 kVA
• Input/nominal system voltage: three-phase 400 V
• Output voltage (single-phase regulation): 230 V ±3%
• Regulation method: servo motor with toroidal transformer
• Start delay (DELAY): adjustable 6–180 seconds
• Modes: independent single-phase operation and three-phase balanced operation
• Protections: phase error detection, overvoltage/undervoltage, overload, overheating, short-circuit
• Additional features: bypass switch, PHASE ERROR indicator, transport wheels

How to use

Install the stabiliser in a dry, ventilated location and connect it to the incoming three-phase mains according to the wiring diagram supplied by the manufacturer. For single-phase loads, connect the required phase outputs; each phase can operate independently. For three-phase loads, ensure all three input phases are connected and balanced. Use the DELAY switch to set a 6–180 second start-up delay when protecting devices with high inrush current. If a phase error is indicated, switch to bypass if needed and investigate the supplying phase before restoring normal operation. Follow the user manual for wiring, grounding and safety procedures.

Usage recommendations

Use the KEMOT PROavr-30k with equipment whose rated power does not exceed the stabiliser’s 30 kVA capacity, and set the DELAY function when connecting devices with high starting currents. Regularly inspect connections and ventilation openings, and do not operate the stabiliser with a missing or faulty phase in three-phase mode; instead rely on the device’s protection indicators and service the unit if an error appears.