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Makers of thermal cutoffs stress enhanced reliability in mature DIP line

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Thermal cutoff

Xiamen Set's model X-3A-1007 radial thermal cutoff supports 250VAC, 60VDC and 3A.

Suppliers ensure compliance with various quality standards to stay competitive while the trend for miniaturization moves toward SMD types.

High product reliability continues to drive China's manufacture of thermal cutoffs, which come in DIP configurations. Makers acquire a number of certification such as CCC, RoHS, TÜV and VDE to bolster the traditional line in the face of the growing SMD segment. Xiamen Set Electronics Co. Ltd includes cUL, KTL, PSE and UL as well.

Suppliers are strengthening their position in the local battery charger and UPS markets, in which they have more than 60 percent share of sales. This is because of advantages of short delivery lead time and aftersales service. Based on shipments, the applications account for 30 percent. Portable electronics, home appliances, LED lighting and industrial equipment are the rest.

To keep up with further miniaturization in terminal devices, China companies plan to venture into SMD production. Only a few offer the kind due to the steep technology required. Dongguan Haodu has patented units measuring 2x6mm mainly for batteries, battery chargers and diode-based luminaires. These SMD releases support maximum 250V and 3A ratings, and 75 to 115 C function temperature. At present, suppliers from Japan and the US, including Littlefuse, AEM and Sart, dominate this segment.

Local output will continue to climb in the months ahead. Many suppliers look to expand yield by another 5 percent in response to steady demand uptick. Exports are projected to follow the same trend.

Companies ship between 20 and 80 percent of production to the Middle East, South America and Russia, although Europe and the US remain the key destinations.

More than 500 suppliers make up the line in China. Most are small and midsize local operations and less than 10 percent are foreign-invested businesses. The last includes LittleFuse, AEM and Sart. The first has three production bases, each in the cities of Suzhou and Wuxi in Jiangsu province, and Dongguan in the province of Guangdong.

The makers gather mainly in the coastal region, specifically in the provinces of Jiangsu, Fujian and Guangdong. The areas have an aggregate share of China’s shipments surpassing 90 percent.

DIP units for battery chargers, UPS

Radial and axial thermal cutoffs form the mainstream selection for battery chargers and UPS. These respectively have plastic and metal or ceramic housings. Releases support 70 to 200 C rated function temperature.

Makers accept custom function temperature, housing type, dimensions and materials. Fusible alloy, epoxy, ceramic and copper are among the main inputs. The options in the first include bismuth, tin, lead and indium. All are sourced locally. Some suppliers obtain epoxy from foreign providers on request.

Input supply and cost are expected to remain stable in coming months. Despite this, a few makers plan to reduce their prices by 5 to 10 percent to boost orders

Related report:
SMD fuses: Production remains on the upswing

Thermal cutoff

Product gallery

Thermal cutoff

Aupo (Xiamen) Electronics Ltd

Model: A Series
MOQ: 10,000 units
Delivery: 7 days
Description: Radial type; 1 to 25A rated current; 76 to 187 C rated operating temperature; custom wire length, sleeve; CCC, cUL, KTL, PSE, UL, VDE

Thermal cutoff

Dongguan Better Electronics Technology Co. Ltd

Model: BTT
MOQ: 1,000 units
Delivery: 10 days
Description: Axial type; 250V, 10 to 15A; 73 to 240 C rated operating temperature; for adapters, transformers, rechargeable batteries, household appliances, gas water heaters, lighting; CCC, PSE, TÜV, VDE

Thermal cutoff

Jiangyin Precision Electrical Equipment Co. Ltd

Model: BRMS
MOQ: 2,000 units
Delivery: 20 days
Description: Thermal switch; 40 to 80 C function, -10 to 120 C ambient temperatures; for notebook PCs, mobile phones, battery packs, adapters

Thermal cutoff

Xiamen Set Electronics Co. Ltd

Model: X-3A-1007
MOQ: 60,000 units
Delivery: 5 days
Description: Radial type; 250VAC, 60VDC, 3A; 200 C maximum temperature; 76 to 221 C rated operating temperature; transparent housing; CCC, cUL, KTL, PSE, RoHS, TÜV, UL, VDE

Note: All price quotes in this report are in US dollars unless otherwise specified. FOB prices were provided by the companies interviewed only as reference prices at the time of interview and may have changed.

Disclaimer: All product images are provided by the companies interviewed and are for reference purposes only. Those product images featuring products with trademarks, brand names or logos are not intended for sale. We, our affiliates, and our affiliates' respective directors, officers, employees, representatives, agents or contractors, do not accept and will not have any responsibility or liability for product images (or any part thereof) which infringe on any intellectual property or other rights of a third party.

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