Single-Phase Servo Regulators Selection Guide: Technical Criteria & Application Standards
Single-Phase Servo Regulators selection guide: technical parameters, mounting and compliance standards, and Siel comparison.
Single-phase servo regulators are voltage regulators that keep the output constant by correcting the voltage of a single-phase (phase-neutral) line with a servo motor variable transformer. They are used in homes, offices, shops and small workshops to protect combi boilers, air conditioners, refrigerators, computers and single-phase machines from voltage drops and rises. This category includes Siel fully automatic models with 1ph/1ph input-output; power ratings such as 3.5 kVA, 7.5 kVA, 15 kVA and 40 kVA are available. Choose the regulator's power by the sum of the rated powers of the devices that will run at the same time and by the inrush current of motor-driven appliances such as refrigerators, air conditioners and hydrophores, and choose the input voltage range by the lowest voltage measured on your line. In high-power single-phase models the input current is large, so the supply cable and fuse must be sized according to the installation project. Because a regulator contains no battery, it does not supply devices when the power is cut and does not replace an uninterruptible power supply (UPS). The Single-Phase Servo Regulators category on Welibaba includes 10 active models from leading manufacturers such as Siel.
Key Technical Parameters for Selecting Single-Phase Servo Regulators
To specify the right Single-Phase Servo Regulators model for your panel or installation, verify the following parameters against your engineering schedule:
| Parameter | Typical Catalog Values | Verification Note |
|---|---|---|
| Manufacturer & Series | Siel | Select according to panel and installation compatibility |
Installation, Compatibility, and Commissioning Checklist
- Electrical & Mechanical Matching: Confirm that rated voltage, current capacity, and mounting dimensions align with the upstream and downstream components in Servo Regulators.
- Environmental & Enclosure Rating: Check IP protection class, housing material, and terminal capacity for dusty, humid, or high-vibration industrial environments.
- Related Product Groups: If your application calls for a different form factor or rating, compare sibling categories such as Three-Phase Servo Regulators.
Frequently Asked Questions
What is the first parameter to check when selecting Single-Phase Servo Regulators?
Start by confirming the circuit's rated electrical values and physical mounting dimensions, then use the technical attribute filters on the Single-Phase Servo Regulators page to narrow down compatible series.
Which Single-Phase Servo Regulators brands are available on Welibaba?
Welibaba currently stocks 10 active models in this category from manufacturers including Siel, complete with verified specifications and unit pricing.
How can I compare Single-Phase Servo Regulators models by manufacturer part number?
You can search directly by manufacturer SKU/order code or use the category filter panel to compare equivalent models across brands side by side.