Advanced welded spot of anti-surge wire wound resistor
The wire wound resistors have been around for more than a half century, they are usually existing in high power circuit design, but are not suitable for anti-surge applications. The reason is a reliability problem of the solder joint between alloy wire and metal cap, when the wire wound resistors are produced, the joint of the welded spot and metal cap may have false welding on the welded spot. Hence, the welded spot will be easily broken when surge across it with huge energy.
Implement
FIRSTOHM realizes the reliability of the welded spot is a key factor to withstand surge. Therefore, we did some researches and avovid this problem. Below pictures show the original welded spot and after implementation:
Original - Traditional wire-wound resistor – Welded spot is not reliable against surge
FIRSTOHM - Improved anti-surge welded spot
SWAT/SWMT : Anti-Surge Wire Wound Fast-Fuse (MELF) Resistor
Feature
- Granted multinational patents.
- Enhanced welded spot is reliable against surge.
- Fast-acting fuse device for high power applications.
- Advanced combined anti-surge & fast-fuse structure.
- Flameproof multi-layer coating equivalent to UL 94 V-0.
- Flameproof feature equivalent to overload test UL 1412.
- Thermal fuse to protect against overheating in electronic products.
Reference Design
Structure
Application
- Power supply
- Charger for mobile phone
- LED Lighting
- Motor star-up protection
- Motor ignition
General Specification
- Files Download
Anti-Surge Wirewound Fast-Fuse Resistor
Anti-Surge Wirewound Fast-Fuse Resistor is specially design a fusible function upon wirewound resistor.
DownloadAnti-Surge Wirewound Fast-Fuse MELF Resistor
Anti-Surge Wirewound Fast-Fuse MELF Resistor is the same as SWM series but specially add fusible function.
Download
