Servo Regulators

Servo regulators are voltage regulators in which an electronic circuit measuring the output voltage uses a servo motor to move the brush of a variable transformer (variac), correcting the voltage continuously without steps. They are used in homes, offices, workshops, factories and construction sites that need a precise output over a wide input voltage range, to supply a whole facility or a single machine. The products are grouped into two subgroups, single-phase and three-phase; Siel fully automatic models come in power ratings such as 5 kVA, 20 kVA, 45 kVA and 100 kVA. Choose the servo regulator by load power (kVA), input and output phase configuration (1ph/1ph or 3ph/3ph), input voltage range, output voltage tolerance and correction speed. Because they contain moving parts such as the motor and brush, correction speed is limited and the brushes wear over time; static regulators are preferred for loads that need a very fast response.

Products

How to choose Servo Regulators

Servo regulators are voltage regulators in which an electronic circuit measuring the output voltage uses a servo motor to move the brush of a variable transformer (variac), correcting the voltage continuously without steps. They are used in homes, offices, workshops, factories and construction sites that need a precise output over a wide input voltage range, to supply a whole facility or a single machine.

  • 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 Servo Regulators and where is it used?

Servo regulators are voltage regulators in which an electronic circuit measuring the output voltage uses a servo motor to move the brush of a variable transformer (variac), correcting the voltage continuously without steps. They are used in homes, offices, workshops, factories and construction sites that need a precise output over a wide input voltage range, to supply a whole facility or a single machine.

What should I compare when choosing Servo Regulators?

Choose the servo regulator by load power (kVA), input and output phase configuration (1ph/1ph or 3ph/3ph), input voltage range, output voltage tolerance and correction speed.

Which product groups are available under Servo Regulators?

The current subcategories include Single-Phase Servo Regulators, Three-Phase Servo Regulators. Open a subcategory to compare its products and technical details.

Servo Regulators Selection Guide: Technical Criteria and Engineering Practice