Voltage Regulators

Voltage regulators are devices that correct drops and rises in the mains voltage and give the connected load a constant output voltage within a certain tolerance. They are connected at the input of a building, a workshop or a single machine to protect voltage-sensitive loads such as CNC machines, compressors, medical devices, combi boilers, air conditioners and office electronics on lines where voltage changes often. This category includes Siel fully automatic regulators with servo motors; power ratings such as 3.5 kVA, 10 kVA and 30 kVA are available in single-phase (1ph/1ph) models, and 15 kVA, 60 kVA and 120 kVA in three-phase (3ph/3ph) models. Choose the regulator by the total apparent power of the loads to be supplied (kVA), the number of phases of the installation, the lowest and highest input voltage measured on your line, and the inrush current of motor loads. Regulator power is given in kVA; a known load power in kW is converted to kVA by dividing it by the power factor. A regulator contains no battery and only corrects voltage; an uninterruptible power supply (UPS) is needed for the load to keep running when the mains fails.

Products

How to choose Regulators

Voltage regulators are devices that correct drops and rises in the mains voltage and give the connected load a constant output voltage within a certain tolerance. They are connected at the input of a building, a workshop or a single machine to protect voltage-sensitive loads such as CNC machines, compressors, medical devices, combi boilers, air conditioners and office electronics on lines where voltage changes often.

  • Determine whether backup power bridging (UPS) or voltage regulation is required.
  • Calculate kVA rating, phase configuration and backup runtime from the critical load list.
  • Verify battery bank, bypass topology and monitoring interface requirements.

Frequently asked questions

What is Regulators and where is it used?

Voltage regulators are devices that correct drops and rises in the mains voltage and give the connected load a constant output voltage within a certain tolerance. They are connected at the input of a building, a workshop or a single machine to protect voltage-sensitive loads such as CNC machines, compressors, medical devices, combi boilers, air conditioners and office electronics on lines where voltage changes often.

What should I compare when choosing Regulators?

Choose the regulator by the total apparent power of the loads to be supplied (kVA), the number of phases of the installation, the lowest and highest input voltage measured on your line, and the inrush current of motor loads.

Which product groups are available under Regulators?

The current subcategories include Servo Regulators. Open a subcategory to compare its products and technical details.

Regulators Selection Guide