Ashley-Edison (UK) Limited has rebranded by way of a name change to Sinalda UK Limited. Learn more >

AC Voltage Stabilisers / Regulators PWM Series

Single-Phase Static Electronic 
2.1 to 14 kVA

PWM Series - Single Phase
Static Electronic Digital AC Voltage Stabilizers
2.1 to 14kVA

PWM Series microprocessor-controlled Single Phase Static Digital Voltage Stabilisers automatically correct brownouts (by boosting low voltage) and over-voltages (by reducing high voltage). 

Being designed for many years of reliable service, Sinalda’s PWM models provide protection from incoming line voltage sags, spikes and surges/swells. As Static Digital solutions, they are virtually maintenance-free and offer an exceptionally fast speed of correction, making them ideal for the most sensitive of electrical and electronic loads.

They are, intended to ensure the delivery of a stable and quality output voltage and have proven to be particularly popular in IT and Comms style commercial applications.

To learn more about the PWM range of  Single-Phase Static Voltage Stabilisers available from Sinalda UK, please check out the listings, or download the brochure below:


Standard Features include:

Automatic Digital Microprocessor Controlled Voltage Stabilization / Regulation
Pulse Width Modulated (PWM) Static Electronic Design – Virtually Maintenance Free
Wide Permissible Input Voltage Window (173 to 287V)
Precise Output Voltage Accuracy (230V ±1%)
TVSS – Transient Voltage Surge & Spike Suppression Protection
Over and Under Voltage Protection
Comprehensive Digital Front Panel with
– Input & Output Voltage & Frequency Metering
– Output Current Metering
– Full Status Indication
Start-Up Load Protection
Input & Output Breakers
Automatic Electronic Bypass
Inbuilt Manual Maintenance Bypass Switch (excluding PWM-2.1H-S25)
Freestanding IP20 Indoor Enclosure
Hard Wire Input & Output (Plug N Play on PWM-2.1H-S25)
Built to comply with leading International Standards
Supplied with a 2 Year / 24 Months Warranty

Permissible Input Voltage Window (S25):

Swing Nominal VoltageMax Model Rating
S25±25%173 to 287V14 kVA

SELECT | Required Power Rating:

Power Rating (kVA)Max Rating (Amps)PWM-H-S25 Model No
2.1 kVA9.1APWM-2.1H-S25
3.5 kVA15.2APWM-3.5H-S25
5.25 kVA22.8PWM-5.25H-S25
7 kVA30.4APWM-7H-S25
10.5 kVA45.6APWM-10.5H-S25
14 kVA60.8APWM-14H-S25

Note: All PWM Stabilisers are designed to support the full load at minimum input volts and maximum ambient temperature.

General Technical Specification

 – Design Topology:IGBT & MOSFET / Pulse Width Modulated (PWM) Inverter / Rectifier Solid State Design
 – Phase:Single Phase, 2 Wire (1P+N+G/E)
 – Power Ratings:6 Model Ratings-
2.1kVA, 3.5kVA, 5.25kVA, 7kVA, 10.5kVA, & 14kVA
 – Frequency:50 / 60Hz (47 to 63Hz)
 – Power Factor:The Power Factor has no effect on performance providing the stabilizer is being used within its rated capacity
 – Nominal Voltage:220V -230V – 240V, Single Phase, 2 Wire (1P+N+G/E)
 – Input Voltage Window Options (S*):230v ±25% (173 to 287V)
 – Voltage:230V ±1%, Single Phase, 2 Wire (1P+N+G/E)
 – Wave Form:Pure Sine Wave
 – Speed of Response:Ultra-Fast – Within 200 milliseconds
(0.2 Seconds)
 – Efficiency:≥95%
Display Panel – Metering, Alerts & Communication:
 – LCD Front Display Panel – Digital Metering:Volts:Input  & Output Volts
Frequency:Input  & Output Frequency
Loading:Output Current (Amps) & Loading Level (%)
– LCD Front Display Panel – Status IndicationLine:Normal Operation Available
Inv:Stable Output Voltage
Bypass:Overload or Fault – In Automatic Electronic Bypass
Fault:Overload or the existence of an abnormal condition
 – Audible AlarmFault & Over Voltage
 – Communication:RS-232 Interface – DB9 Pin Style Port on the Rear
Protection Features:
 – Over Current:Input & Output Breakers – as Standard 
 – Spike & Surge Protection:MOV (Metal Oxide Varistor)
 – Noise Protection:EMI Filter
 – Overload Protection:More than 105% Output Automatically Disconnected – requiring Manual Restart
 – Over & Under Voltage Protection:Protection against high and low voltage with automatic output disconnection requiring manual restart
(Output Under Limit 188V ±4V, Over Limit 270V ±4V)
 – Short Circuit Protection:Automatic output disconnect requiring manual restart
 – Restart Time Delay:Automatic restart in the event of a power outage with settable time delay
 – Automatic Bypass:Automatic transfer to Bypass in the event of an overload or unlikely system fault
 – Manual Maintenance Bypass:Inbuilt ability to manually re-route the supply feed to bypass the stabilisation function
 (Not available on 2.1kVA – PWM-2.1H-S25 – model)
 – Operating Temperature Range:0°C to +40°C
Derate by 2% for each additional °C up to max 60°C
 – Maximum Altitude:2000 meters (derate by 1% per additional 100 meters)
 – Relative Humidity:Suitable for indoor tropical use – 0 to 95% (non-condensing)
 – Harmonic Distortion:<3% of THD for Linear Load
 – Cooling:Forced Fan Cooling
 – Audible Noise:@ 1 meter <50 dBA (dependent on model rating)
 – Power Connections:Hardwire Input & Output
Plug N Play – IEC-320 (10 Amp) on the 2.1kVA – PWM-2.1H-S25 – model
 – Construction:Sheet Steel Enclosures with Plastic Moulded Front Covers to IP20 / NEMA 1 Style – BS EN 60529  (Castors fitted on 10.5 & 14kVA models)
 – Paint Colour:RAL 7047 (Telegray 4 – Epoxy Powder Coating)
 – Dimensions & Weights (W x H x D – Kg):2.1kVA – PWM-2.1H-S25258 x 333 x 422mm – 23Kg (Packed Carton – 39 x 45 x 54cm – 26Kg)
3.5kVA – PWM-3.5H-S25258 x 333 x 422mm – 29Kg (Packed Carton – 39 x 45 x 54cm – 32Kg)
5.25kVA – PWM-5.25H-S25258 x 333 x 422mm – 30Kg (Packed Carton – 39 x 45 x 54cm – 33Kg)
7kVA – PWM-7H-S25258 x 333 x 422mm – 32Kg (Packed Carton- 39 x 45 x 54cm – 35Kg)
10.5kVA – PWM-10.5H-S25258 x 546 x 531mm – 58Kg (Packed Pallet – 39 x 45 x 54cm – 69Kg)
14kVA – PWM-14H-S25258 x 546 x 531mm – 62Kg (Packed Pallet – 39 x 45 x 54cm – 73Kg)
Certification & Conformance:
 – EMC Conformance:BS EN 55022 and relevant parts of BS EN 61000
 – CE Certification:CE Marked – 2014/30/EU (The EMC Directive) and 2014/35/EU (The Low Voltage Directive)
 – Warranty:2 Years / 24 Months from date of supply

All PWM Stabilisers are designed to support the full load at minimum input volts and maximum ambient temperature.

Sales & Support
Data Sheet – H Series
[220V to 240V Models]

Guide Specification

Operator / User Manual

CE & UKCA Certification

PWM Series Single-Phase Static Electronic Digital AC Voltage Stabilisers comply with the relevant European Union – and corresponding UK – health, safety, and environmental protection directives and regulations and are duly CE / UKCA marked.

Sinalda UK Declaration

EMC Directive – 2014/30/EU – in force from April 2016
Low Voltage Directive – 2014/35/EU – in force from April 2016


You can either buy direct from us, or via one of our approved resale partners or, if you prefer, online at –

Amazon UK

Buy on Amazon UK[Click on the Rating]

H Series (230V)
>> 2.1kVA>> 3.5kVA>> 5.25kVA>> 7kVA>> 10.5kVA>> 14.kVA

eBay UK

[Click on the Rating]H Series (230V)
>> 2.1kVA>> 3.5kVA>> 5.25kVA>> 7kVA>> 10.5kVA>> 14.kVA


      PWM Series | Image Gallery

If you do not find the Static Voltage Stabilizer that meets your application’s exact needs, please contact us with your specific detailed requirements.