Non Contact Safety Switches
Non-contact safety switches are a type of safety switch that operates without the use of conductive contacts to complete or break the circuit. Instead, they utilise a magnet, transponder or inductor to detect when the power to a machine needs to be cut. They can be used in machine-guarding applications to prevent injury to personnel in hazardous areas.
What Are the Advantages of Non-Contact Safety Switches?
Non-contact safety switches offer several advantages that make them preferable in various industrial applications. One key benefit is their durability; they are very long-lasting and require minimal maintenance, reducing downtime and operational costs.
These switches are resistant to shock and vibrations, ensuring reliable performance even in harsh environments. Additionally, non-contact safety switches are relatively tamper-proof, enhancing the safety and security of machinery. Their design also allows for flexibility in installation, as they do not require precise alignment.
Furthermore, magnetic interlock safety switches and coded magnetic switches provide enhanced security by ensuring that only matching pairs can activate the switch, preventing unauthorised access.
Types of Non-Contact Safety Switches
Non-contact safety switches may operate using different methods, including by magnet, transponder or inductor. They can also differ in terms of their terminal type, connection type, and crucially, the distance at which the switch will be operated. This determines the level of sensitivity the switch has, and how quickly it will activate when it detects that power needs to be cut.
- Magnetic Safety Switches: Magnetic interlock safety switches use magnetic fields to detect when a door or guard is open. They are highly reliable and resistant to dust and water, making them suitable for harsh environments. These switches are easy to install and align, providing a tamper-proof solution for machine safety.
- Transponder Safety Switches: Transponder safety switches use coded signals to ensure that only the correct actuator can activate the switch. This adds an extra layer of security, preventing unauthorised access and tampering. They are ideal for applications requiring high safety levels.
- Inductive Safety Switches: Inductive safety switches detect metal objects without direct contact. They are highly resistant to dirt and debris, ensuring consistent performance in industrial settings. These switches are suitable for applications where mechanical wear and tear must be minimised.
- RFID Safety Switches: RFID safety switches use radio-frequency identification technology to monitor and control access to machinery. These switches offer high flexibility and can be programmed to recognise multiple RFID tags.
Types of Non-Contact Safety Switch Materials
Non-contact safety switches are constructed from various materials to enhance their durability, performance, and suitability for different environments. Here are some of the common materials used:
Stainless Steel: Highly resistant to corrosion, stainless steel is ideal for use in harsh industrial environments. It is commonly used in food processing and pharmaceutical industries due to its hygienic properties and ability to withstand frequent cleaning.
Plastic: Lightweight and cost-effective, plastic provides excellent electrical insulation. It is suitable for general-purpose applications where high mechanical strength is not a primary requirement, such as in consumer electronics and office equipment.
Aluminium: Aluminium is lightweight yet strong, offering good resistance to environmental factors and corrosion. It is used in aerospace and automotive industries for safety cut off switches and non contact relays due to its durability and performance under stress.
Polycarbonate: Known for its high impact resistance and excellent clarity, polycarbonate makes it easy to inspect internal components. It is ideal for magnetic interlock safety switches and coded magnetic switches in environments where visibility and toughness are essential.
PBT (Polybutylene Terephthalate): PBT provides high mechanical strength and excellent thermal stability. It is used in applications where safety switch price is a concern, such as in mass-produced industrial safety systems.
Buying Non-Contact Safety Switches: Ordering & Delivery
RS is a trusted supplier and distributor of a comprehensive range of non-contact safety switches at a great price, from industry-leading brands such as Eaton, Omron, Schmersal, Sick, and more. Our stock includes various models with different voltage ratings, housing materials, actuator types, safety categories, and more to meet your specific needs.
To place an order online, simply browse our extensive catalogue, where you can filter and select your preferred products based on your specifications. You can be sure of a swift delivery by RS Singapore once you place your order. For more details on delivery services and fees, please refer to our Delivery Page.