ATEX Micro Switches SM31-G9 and SM51-G5W11: Durability and Safety in Critical Environments
What is a Microswitch?
The micro switch belongs to the family of switches and is used in electrical circuits to control low-intensity current flow. These are electromechanical devices characterized by compact dimensions and a short distance between the contacts and the actuation mechanism.
Micro switches offer numerous advantages, including a long operational life, which reduces the need for frequent replacements, making them a reliable and cost-effective solution.
Types of Micro Switches
There are various types of micro switches available on the market, designed in different shapes and sizes to easily adapt to a wide range of equipment and meet specific needs. Some of the most common models include:
• Lever micro switches and toggle micro switches;
• Slide micro switches;
• Push-button micro switches.
Among the most common types of micro switches are the lever micro switch and its subcategory, the toggle micro switch.
Lever micro switches, or microswitches, stand out for their compact size and are designed to interrupt or divert low-intensity currents. They are ideal for controlling current flow in small circuits as they require minimal actuation force.
Thanks to their low cost and ease of installation, these devices are widely used in household appliances, electronic equipment, and automatic machines.
The ATEX micro switches models SM31-G9 and SM51-G5W11 are designed to provide maximum reliability and safety, even in environments with flammable gases and explosion risks.
Thanks to their compliance with ATEX standards, these devices are perfectly suited for sectors such as commercial refrigeration, where, for example, refrigeration systems containing hydrocarbons are used, offering advanced protection and optimal resistance in complex environmental contexts.
Key Features of the SM31-G9 and SM51-G5W11 Micro Switch Models
SM31-G9 Series
| Rating |    |
| Operating Frequency | Electrical 10-30 cycles/min Mechanical 120 cycles/min |
| Operating Temperature | -25°C ̴ +120°C |
| Protection Grade | IEC IP67 |
| Service Life | Electrical 10.000 ̴ 100.000 cycles (Depends on P/N) Mechanical 500.000 cycles/min |
SM51-G5W11 Series
| Rating | |
| Operating Frequency | Electrical 10-30 cycles/min Mechanical 60 cycles/min |
| Operating Temperature | -80°C ̴ +85°C |
| Protection Grade | With Terminal Type IEC IP67 (Exclude terminal) With Wire Type IEC IP67 |
| Electric-shock Safeguard Grade | Class II |
| Service Life | Electrical 10.000 ̴ 100.000 cycles (Depends on P/N) Mechanical 500.000 cycles/min |
ATEX Directive and Applications of Certified Micro Switches
The EU F-Gas Regulation aims to reduce carbon emissions and improve energy efficiency in refrigeration, air conditioning, and heat pump systems, making it essential to adopt safe and compliant solutions, such as ATEX micro switches.
The SM51-G5W11 and SM31-G9 series, thanks to their robust construction and high-quality materials, are ideal for household appliances, refrigeration units, air conditioners, and fans in environments with the presence of potentially explosive gases. The ongoing certification of the SM51-G5T16 code will further expand the offering for applications in critical environments.
The micro switches from the SM51-G5W11 and SM31-G9 series are therefore a reliable choice for those seeking uncompromised safety.
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