Gallery View: Compact size, high reliability persist as key trends in microswitches

More suppliers are looking to introduce microswitches in popular ultracompact size of 12.8x6.5x5.8mm.

Makers of microswitches in China are sustaining R&D efforts to turn out ultrasmall units with a long operating life. They target as small as 12.8x6.5x5.8mm releases, which are considered hot lately. Shanghai Sinmar has such a model for various applications. The 0.6g unit exceeds 1 million mechanical and 10,000 electrical cycles.

The mainstream lineup consists of push-button, reed, lever roller, and long- and short-arm types in miniature, subminiature and ultraminiature sizes. These are resistant to water, dust and explosion, and can withstand temperatures as high as 250 or 400 C.

The components, which suit household appliances, computers, audio systems, mobile phones and industrial equipment, have 125/250VAC voltage, and are available in 1, 3, 5 and 10A current ratings. These usually have 50mohm maximum contact and 100Mohm minimum insulation resistance. The operating temperature is -40 to 85 C and the mechanical life span ranges from 30,000 to 100 million cycles. Water-resistant versions are in IP40, IP65, IP67 and IP68 kinds.

Key materials such as brass, tin brass, stainless steel, nylon 66 and silicone rubber are sourced locally. To ensure better quality, some makers use brass from Japan, and plastic from Italy and France.

The increase in input costs in the previous year, resulting in a 5 percent upward adjustment in product prices. In the months ahead, not much fluctuation in outlay and quotes is expected.

The products in this gallery have been handpicked by our China-based market analyst for representing current trends in microswitches from China makers.

12VDC, 50mA rated voltage, current

Rated at 12VDC, 50mA, this microswitch from Kaihua Electronics Co. Ltd, CMI627301D37 model, suits computers, consumer electronics, medical products, and testing and telecom equipment. It has 60±15gf operating force and 5 million-cycle mechanical life span.

The 20,000-unit minimum order has a 15-day delivery lead time.

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30VDC, 0.1A rating

This 30VDC, 0.1A microswitch from Kaihua Electronics Co. Ltd, CMI853501D01 model, has 100mohm maximum contact resistance and 1,000mohm minimum insulation resistance at 250VDC. The withstand voltage is 250VAC/min at 50/60Hz. The unit requires 70 to 90gf to open or close contacts. In life testing done, the minimum life span is 1 million cycles.

The minimum order is 20,000 units. Delivery is within 15 days.

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125/250VAC, 5 or 10A rating

From Ningbo FBELE Electronics Co. Ltd, the model MSW-13 microswitch comes in variants with 125/250VAC, 5 or 10A rating and 1,500VAC/min dielectric strength. It has 30mohm maximum contact resistance and 100mohm minimum insulation resistance at 500VDC. The electrical life span is 100,000 cycles and the operating temperature -25 to 80 C.

An order of at least 500 units is required and delivered within 15 days.

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30mohm maximum contact resistance

Model MSW-21 microswitch from Ningbo FBELE Electronics Co. Ltd has 30mohm maximum contact resistance and 100mohm minimum insulation resistance at 500VDC. The unit, which supports a 100,000-cycle electrical life span, has 125/250VAC, 5 or 10A rating and 1,500VAC/min dielectric strength. It operates in -25 to 80 C.

The supplier requires a minimum order of 500 units. Delivery is within 15 days.

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12 to 60VDC, 5mA to 2A rating

Shenzhen Baokezhen Electronics Co. Ltd's M02 Series model is a microswitch with 12 to 60VDC, 5mA to 2A rating and 50mohm minimum insulation resistance. The IP65- or IP67-rated with a 5 million-cycle minimum life span suits home appliances, testing equipment, and automotive and intelligent control applications. It meets IEC 61058.1, UL 61058.1 and GB 15092.1 standards.

The minimum order of 100 units has a 25-day delivery lead time.

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1,000Mohm minimum insulation resistance

The model M12 Series microswitch offered by Shenzhen Baokezhen Electronics Co. Ltd has up to 10(4)A current rating and 1,000Mohm minimum insulation resistance. It comes in IP40, IP65 and IP67 versions and has a minimum mechanical life span of 1 million cycles. The unit suits home appliances, portable tools, testing equipment, and industrial control and automotive applications. It complies with IEC 61058.1, UL 61058.1 and GB15092.1 requirements.

An order of at least 100 units is for delivery within 25 days.

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