WESCO · Voltage Sag Protection SINCE 2001
A Voltage Sag doesn't stop the equipment — it stops production.
The grid voltage dips for a fraction of a second. Lights merely flicker — production equipment shuts down. Restarting takes hours.
What is a voltage sag?
A voltage sag isn't an unavoidable natural disaster — it's a preventable electrical incident.
Also called a voltage dip. IEC and SEMI standards use "voltage sag".
The cause is usually outside your plant
- Lightning strike
- Grid switching
- Nearby motor starting
- Transformer energizing
What one incident leaves behind
Direct Loss
- Equipment Stop · Production Halt
- Product Defect · Scrap
Indirect Loss
- Restart Time · Delivery Delay
- Customer Trust · Production Schedule Disruption
What TSP does
TSP sits in series between the grid and the load. In normal operation it simply passes power through; the instant the voltage drops it disconnects the grid and fills the load voltage from energy stored in ultra-capacitors (EDLC). Once utility power returns, it re-synchronises and goes back to pass-through.
This is what you see on the panel
The 7-inch touch panel shows live measurements alongside the event record. Tap a menu.
Input and output voltage, current, DC charge level, detection and recovery thresholds — on one screen.
No batteries involved
EDLC replaces the battery bank — no three-year replacement cycle.
Ultra-Capacitor · 10+ Years Maintenance-Free
10+ years with no replacement
No Cooling Fan · Natural Cooling
eliminates fire and failure risk at the source
98% Efficiency · 2 ms Ultra-Fast Response
the Voltage Sag protection specialist
Already in service at
On site
Watch installation and operation videos
Semiconductor
Samsung Semiconductor · SK hynix · TSMC · Sony · X-FAB · Western Digital · NXP · UMC · SK Siltron · LB Semicon · ASE Korea · Hana Micron
Display
Samsung Display · LG Display · BOE · Visionox · CSOT · Tianma · Innolux · AGC · Corning · STEMCO
Automotive
Hyundai Motor · Kia · Hyundai Kefico · HL Mando · Renault Korea · Hankook Tire · Nexen Tire · PHC Valeo · Donghee · Toyota · Continental
Battery
LG Chem · SK Chemicals · SK on · Samsung SDI · LG Energy Solution · POSCO · Hyundai Steel · Huvis
PCB · Steel
Samsung Electro-Mechanics · LG Innotek · Heesung Electronics · Daeduck · Interflex · Simmtech · Korea Circuit · Doolim Yaskawa
One field only, since 2001 — voltage sag protection
- Developed the first voltage sag compensation solution in Korea, 2001
- One field only — no other business line
- Built in our own EMS plant in Icheon, Korea
- Single-phase 0.5 kVA to three-phase 2,400 kVA — from one maker
Certifications & assessments
ISO 9001
ISO 14001
CE · TÜV NORD
KC
S-Mark
NRTL (UL 1778)
SEMI F47 assessment report held
Send an enquiry
Tell us the equipment rating and the process you want to protect — we'll come back with a suitable configuration.
Not ready to enquire yet? Get the TSP catalogue
Product lineup, specifications and application cases. Leave your company and email to download it straight away.
Email us directly · wesco@wesco.co.kr