In the elevator industry, limit switches with safety functions are widely used. Especially on some important safety components, such as elevator terminal limits, safety clamps, and speed limiters. All limit switches with safety functions are definitely open. 

SUNS is a global professional manufacturer of industrial switches, committed to providing high-quality and highly reliable industrial switches to the world. The product covers limit switches, pull rope switches, safety door switches, foot switches, micro switches, ignition switches, toggle switches, etc.

SUNS has always advocated innovative concepts, and continuous R&D investment ensures technological leadership; A sound project management system ensures the quality and progress of research and development. The company has strong technical strength, with SUNS Global R&D Center located in Boston, USA, always standing at the forefront of switch design technology, constantly innovating, providing sufficient technical reserves for the company's development, and providing strong technical support for the Chinese R&D center. The Chinese R&D center pays more attention to the reliability and safety design of products. The product development adopts first-line design software and advanced tools such as motion simulation and finite element analysis, ensuring that the products are effectively validated in the design stage. The product design complies with the latest international safety standards and has obtained safety certifications from multiple countries such as UL, CSA, CE, CCC, T ü V. Domestic factories have UL authorized witness testing laboratories. SUNS has multiple patents in the electrical field and has a leading advantage in technology. SUNS Electric (Zhangzhou) Co., Ltd. is a wholly-owned subsidiary of San San International (USA) Co., Ltd. and is a ********* high-tech enterprise. The factory has an internationally leading product testing laboratory, professional testing equipment, and production management to ensure the quality of our products; SUNS regards quality as life, adheres to the principle of "quality first, customer first", relies on advanced management concepts and a perfect ERP management system, and implements ISO9001:2000 and Liuxi Mag quality management systems.

The SUNS brand is popular in the European and American markets, and has gained the favor and trust of machine and equipment manufacturers. It is a qualified supplier and partner for many Fortune 500 companies. International leading product quality, competitive prices, and domestic production ensure timely delivery for you. A flexible business mechanism provides you with the most suitable products and services. Tailored to meet your special requirements. Three is your ***** choice.

SUNS American Three SND4 series safety limit switch

Product certification: UL、CSA、CE、CCC

High strength glass fiber reinforced nylon shell, double-layer insulation, normally closed contact forced opening, mechanical action and electrical circuit separation. Shell size: 31 × 62 × 30.5mm, installation hole distance: 22mm. Outlet hole: It is recommended to use M20 when exporting to Europe and 1/2NPT to convert the head direction to 4 × 90 ° when exporting to North America. Remove the four screws on the head to change the head direction in four directions. Contact structure: Zb， The contact forms include: Fast 1NO/1NC, Fast 2NO/2NC, Slow 1NO/1NCBBM, Slow 1NO/1NC MBB, Slow 2NC, Slow 2NO, Slow 3NC, Slow 3NO, Slow 2NC/1NO BBM, Slow 2NC/1NOMBB, Slow 1NC/2NO BBM, Slow 1NC/2NOMBB. Operating speed: 0.5mm-2m/sec Operating frequency: Mechanical 120ops/min Electrical 30ops/min Insulation resistance:> 100M Ω @ 500V DC contact resistance:< 25m Ω (initial value) Rated current/voltage: 10A/600VAC (EN60947-5-1) Electrical grade: UL/cUL Listed (E216958) AC15 A600/DC13 Q300 Voltage withstand value: 1000V AC 50/60Hz between terminals of the same level for 1 minute Terminal to ground or to unloaded metal 2500V AC 50/60Hz for 1 minute Lifespan: Mechanical 1.0 × 10 ^ 7 Electrical 5 × 10 ^ 5 Environmental temperature: -25~+80 ℃ (-13~+176 ℉) Humidity:< 95% RH protection level: IP67

Introduction to China's Elevator Industry

From 1900 to 1949, the sales, installation, and maintenance stages of imported elevators.

From 1950 to 1979, we adhered to independence, arduous research and development, and extensive production, mainly focusing on domestically produced products.

From 1980 to 2007, the establishment of foreign-funded enterprises marked the rapid development stage of the industry.

From 2008 to 2018, the industry experienced a period of rapid development. China has become the world's largest market for newly installed elevators and the largest producer of elevators.

At present, there are about 12000 enterprises in China with elevator installation, renovation, and repair qualification certificates, mainly engaged in elevator sales agency, installation, renovation, repair, maintenance, and other businesses, undertaking about 70% of the maintenance work of elevators in use in China. After a stage of rapid development, the domestic elevator industry has entered a period of stable growth, with little change in annual output. However, the growth rate has begun to decline. In the next 3-5 years, the new elevator market will mainly rely on the construction of affordable housing, shantytown renovation, urban rail transit, public infrastructure construction, and other aspects. Another important aspect is the installation of elevators in old buildings. In the government work report of the second session of the 13th National People's Congress in 2019, it was clearly pointed out that "there are a large number of old urban communities, and they need to vigorously upgrade, update water, electricity, gas and other supporting facilities, support the installation of elevators and barrier free environment construction, and improve convenience markets, convenience stores, pedestrian streets, parking lots and other living service facilities." Since the 1980s, China has built 8 billion square meters of existing buildings without elevators, involving 70 to 100 million households, about 200 to 300 million people, most of whom are housing reform houses. Currently, there are approximately 50 million registered and still in use housing reform units, estimated to be operable. It is predicted that the market for installing elevators in old buildings has at least 10-15 years of development space. To solve the problem of elderly people going up and down stairs nationwide, at least 2.8 million elevators need to be installed, with a total investment of 750 billion yuan, which will drive the development of the entire industry chain in society.

The switches produced by San San ensure high safety levels and reliability. With decades of high-quality production experience in the industrial switch industry, SUNS has numerous solutions for product practicality and market development. Our elevator safety limit switches can be used not only for new elevator installations, but also for retrofitting old elevators to improve safety performance. Elevator safety limit switches can make elevator products safer and also make elevator maintenance and installation more economical.