Switch and relay manufacturers are further enhancing their product reliability designs to meet more stringent industrial and military applications. Products designed for these applications often need to meet the most stringent environmental requirements, such as water, heat, solvent, dust, and other contaminants. In many cases, they also need to resist high-strength impact and vibration, and require a long mechanical life. In the past six months, several switch and relay manufacturers, including knitter switch, EAO, electroswitch, ITT cannon and NKK, have launched new products that can withstand harsh environments.
EAO's key lock switch has IP67 protection characteristics.
Knitter switch is one of the largest switch manufacturers in Europe. According to Zhong Linhao, the company's chief representative in charge of China's business, knitter switch has 39 years of experience in switch product development and the most complete product line. The company has gradually begun to expand its business to the Asia Pacific market through cooperation with its sub distributor airray and logistics provider Schenker. Recently, the company has launched a series of small electromechanical switches for industrial applications, including smr1-30 surface mount (SMD) micro rotary switch and ultra-thin SMD multifunctional switch tssj 55.
According to reports, the smr1-30 rotary switch with a size of only 5 × 3mm is one of the smallest switches of the same kind. It is suitable for applications with high requirements for size and reliability, such as hearing aids in medical applications and Multimeter in measurement applications. The product has channel and mode options. It is a dual position SMD SWITCH meeting ROHS requirements. It is easy to clean and adopts lead-free soldering. The rated load performance value of the product is 12VDC / 50mA, the contact resistance is 100m Ω, the insulation resistance is 50g Ω, the insulation strength is 500VAC, lasting for 1 minute, the working temperature range is - 30 ~ + 85 ℃, and the mechanical life is longer than 800 switches.
The ultra-thin SMD multi-function switch tssj55, which also meets the requirements of RoHS, will be widely used in the space precious occasions. The size of tssj 55 is 10.4 × 10.4 × 1.55mm. It integrates five independent switches without buttons, allowing customers to customize buttons according to their specific product application needs. It is suitable for all applications that emphasize reliability and long mechanical life (at least 200000 operating cycles). The contact rating of the switch is 12VDC / 50mA, the maximum contact resistance is 100m Ω, the operating temperature is - 20 ~ + 70 ℃, and the storage temperature is - 40 ~ + 85 ℃.
For industrial applications, electroswitch, another leading switch manufacturer, has launched a variety of robust products, including pawl, pull-in and cam operated rotary switches, as well as tap and knife switches. The company points out that all of its industrial switches have long-life contacts that guarantee trouble free operation and reliable performance under the worst shock and vibration conditions. Many specialized models use keylock, gear drive and special custom configuration. In order to meet the needs of military applications, the company recently launched a series of 24g products and control switches, which can withstand the test of severe military applications. The rotor (movable contact) is made of silver phosphor copper, the stator (fixed contact) is made of silver copper, and the spacer is made of glass filled alkyd resin, which can be installed waterproof.
EAO switch provides a variety of industrial stainless steel switches, keyboards and keyboards for harsh environments. These products have the protection characteristics of international standard IP67, which are waterproof, heat insulation, shock proof and damage proof, and require little maintenance. Some models have stainless steel rings and bases to protect the switch, making it suitable for wet and dusty environments. Products for security applications must be able to withstand harsh environments and prevent malicious damage and careless use.
Recently, EAO has introduced several key lock switches to expand its product selection for security applications. These new switches have optional safety features that prevent unauthorized contact and a higher level of safety control. The key lock switch is made of high quality materials and tested according to many international standards including IP67. These devices can also be embedded to prevent malicious damage. The company has also developed 61 series switches, which can meet the IP65 front-end protection standard. These 16mm oil and water-proof switches are available with a variety of actuators, including push-button, indicator, key lock and selector switch, as well as en-418 emergency stop. They are especially suitable for mechanical, process control, medical equipment and instrumentation industries.
NKK switches has some special protection measures. For example, the E-Series lightweight micro toggle switch has a high torque to prevent rotation and separation from the metal frame during installation, as well as a stainless steel frame to protect it from corrosion. Moreover, if the lever is suddenly subjected to downward force or other rough handling, an anti-interference design can be used to prevent damage to the contact system. In double pole mode, the higher insulation prevents these switches from crossing. These switches use standard welded lugs or terminals and are sealed with epoxy to prevent flux and other contaminants from entering.
Similarly, the company's new M2b series of sealed micro button switches have several design features to prevent contaminants from entering. These features include: there is an internal O-ring around the actuator inside the bushing, and ultrasonic welding and epoxy sealing terminals are used in the bushing and base. In addition, the casing and the top of the base are integrated to provide additional protection to prevent the entry of cleaning fluid and other liquids.
The height of knitter switch's new multifunctional switch is only 1.55mm.
The AR4 and AR5 series analog joystick switches produced by ITT cannon adopt non-contact inductive design, which can provide accurate proportional output and are suitable for field mechanical use. The service life of the product is more than 1 million times (AR4 is more than 1.5 million times). It has high reliability and can be used in harsh environment. AR4 and AR5 analog rocker switches meet electromagnetic compatibility (EMC) requirements and mechanical vibration standards. The products have passed the salt spray test and chemical splash test (SAE j1455 4.3.3). AR4 series meets IP67 requirements, AR5 meets IP65 standard.
In terms of relay, the new products also focus on harsh application environment. For industrial applications, Tyco Electronics has launched the Kilovac ev200 series relay. The product is developed to cope with harsh environment. Its inherent safety makes the coil and contact free of oxides or pollutants. Even if it is used for many years or not, its contact resistance is quite stable. Due to its small size and high contact current, ev200 relay is suitable for battery switching, backup, DC voltage and power control, circuit protection and safety. The mechanical life of the relay is 1 million times.
< P style: switch and relay manufacturers are further enhancing their product reliability design to meet more stringent industrial and military application requirements. Products designed for these applications often need to meet the most stringent environmental requirements, such as water, heat, solvent, dust, and other contaminants. In many cases
="Text indent: 2em;" > while gigava claims that its new G71 single pole 70kv relay can be used safely in almost all environments, and can work where other similar products can't. SF6 gas is filled to ensure low leakage and high current capacitor discharge switching. The new relay is not affected by humidity or dust, and can work in the temperature range of - 50 ~ + 85 ° C. It is expected that switch and relay manufacturers will continue to introduce more robust products to meet the most demanding requirements, with unique characteristics, and not afraid of harsh environment and rough use.