WESCO · Power quality guide
Battery-Free Voltage Sag Protection (EDLC): How It Works
WESCO TSP® (The Second POWER) uses EDLC supercapacitors for energy storage to protect connected industrial loads against brief voltage sags and momentary interruptions. The protection scope depends on the selected product, its connected load and the operating conditions. TSP is intended for short supply disturbances; selection should consider the required compensation time rather than assume the same protection for every event.
Semiconductor and display facilities, automotive production, battery plants and other manufacturing operations can have equipment that is sensitive to supply disturbances. The starting point is to identify the control circuit, equipment or production line that needs protection, then confirm its electrical ratings and operating requirements.
Battery-free vs. battery-based protection
TSP uses EDLC supercapacitors for compensation energy rather than conventional storage batteries. This avoids recurring replacement of those batteries, but does not remove the need for equipment inspection and maintenance. A comparison with battery-based UPS protection should consider the load and required backup duration, as well as the energy-storage method.
- Energy storage: EDLC supercapacitors supply energy for brief disturbances. Read about EDLC storage principles.
- Selection: check the applicable model's voltage, capacity, response and compensation duration against the load and supply conditions.
- Protection scope: the equipment connected to TSP within the selected ratings. This does not automatically include every machine in a factory.
- Maintenance: follow the applicable manual for inspection, cleaning and component management. Component life varies with operating conditions.
Who makes WESCO TSP?
WESCO Co., Ltd. is a South Korean manufacturer established in 2001. Its company introduction describes the TSP product range and applications in semiconductor, display and general manufacturing. WESCO product information and contact can help confirm the applicable model and documentation.
Frequently asked questions
What is a battery-free voltage sag protector?
A battery-free voltage sag protector uses EDLC supercapacitors rather than conventional batteries for compensation energy storage. WESCO TSP® is designed to supply its connected protected load during brief voltage sags or momentary interruptions, within the selected model's capabilities.
How do single-phase and three-phase applications differ?
The single-phase installation series explains equipment control-power protection. The three-phase series explains protection for the selected three-phase equipment or load. In both examples, the basic path is distribution panel to TSP INPUT, then TSP OUTPUT to the protected equipment. Actual selection depends on ratings, wiring arrangement and load conditions.
How fast does TSP respond, and how long can it compensate?
Response time and compensation duration are different specifications. Check both in the documentation for the applicable TSP model and load, including the supply disturbance and operating conditions. A duration shown in an educational example is not a guarantee for every configuration.
Does battery-free mean maintenance-free?
No. EDLC compensation storage avoids periodic replacement of conventional storage batteries, but the equipment still requires inspection and component management under the applicable manual. Storage and component life depend on operating conditions; an approximate replacement interval is not a service-life guarantee.
Are communications and SAG Viewer standard requirements?
Communications and SAG Viewer are optional. When the option is configured, a computer can be used to review events and waveforms. Monitoring options should be confirmed for the selected product.
Watch the installation explanations
- With and without TSP® — a visual explanation of protection for connected equipment.
- Single-phase TSP® installation and commissioning — control-power installation, terminal covers and normal-status checks.
- Three-phase TSP® installation and commissioning — product ratings, internal wiring, power-up, charging and standby indication.
These multilingual films are AI-assisted educational reconstructions based on product references, not customer-site footage or performance-test records. See the video library for all available languages and earlier company and demonstration materials.
Related insights
Continue with voltage sag monitoring and protection selection, or browse Technical Guides · 기술 자료 (한국어).
This overview summarizes WESCO product and training materials. Confirm the applicable model ratings, installation requirements and maintenance instructions with WESCO for the intended load and operating environment.