Overview of Safety Relays
Safety relays are components specifically designed for safety control circuits, serving as protective barriers in automated systems. Their core function is to receive safety input signals and use built-in logic to determine whether to send switching commands to controlled equipment. To ensure reliability, safety relays typically employ a dual-channel signal processing mechanism, operating only when both channels are functioning normally. If any channel fails, the relay immediately stops output until the issue is resolved and the system is reset.
These features enable safety relays to effectively reduce misoperations and provide a higher level of safety, making them particularly suitable for machinery that poses potential risks to operators.
Key Differences from Standard Relays
Size and Form: Compared to standard relays, safety relays are larger in size and often come in modular forms rather than as single components.
Color Coding: For easy identification, safety relays often use prominent colors such as yellow or red as their primary.
Enhanced Safety: Safety relays have a higher diagnostic coverage (DC), meaning they can better detect internal faults, making them suitable for applications requiring higher safety levels.
Forced-Guided Contacts: Even if the contacts weld, the forced-guided contacts in safety relays ensure that two sets of contacts (NO/NC) cannot close simultaneously, a safety feature not available in standard relays.
Application Areas
Safety relays are widely used in various industrial safety scenarios, such as:
Electromagnetic Door Lock Switches: Ensuring the safety of work areas.
Key-Operated Safety Door Switches: Detecting the opening and closing of doors.
Safety Door Limit Switches: Detecting the position of doors, whether open or closed.
Safety Light Curtains: Preventing workers from entering hazardous work zones.
Safety Mat Switches: Confirming that workers can safely enter dangerous work areas.
Emergency Stop Buttons: Stopping machine operation in emergency situations.
Due to their unique design and functionality, safety relays are indispensable safety tools in industrial environments.
Features of Beijing Pinghe Safety Relay Products
Safety relays are used in the safety instrumented systems (SIS) of process industries as interfaces between controllers and actuators, providing electrical isolation and power driving functions. Their internal circuit design follows the principle of fail-safe operation, utilizing multiple redundant output circuits to ensure that the power source to the actuator is reliably cut off in the event of external input interruption or internal component failure.
Beijing Pinghe SIS Safety Relay Products offer:
Redundant circuit design.
Offline verification of relay contacts.
Fail-safe technology and contact welding protection, with replaceable fuse design.
Ultra-thin design, with a thickness of only 12.5mm, saving 50% of installation space.
Beijing Pinghe Mechanical Safety Relay Products offer:
Dual-channel safety conditions, with real-time monitoring of dual-channel input signals.
Special logic structure design, ensuring safe output even in the event of a single functional fault.
Feedback monitoring of safety output, eliminating functional abnormalities and preventing the accumulation of safety hazards.
Beijing Pinghe safety relay products comply with the performance level EN ISO 13849, PL e standard, and the safety category EN ISO 13849, Cat. 4 standard, and have SIL3 functional safety certification.
For Safety, Efficiency, and Excellence!
Beijing Pinghe is committed to developing and manufacturing products with core competitiveness, safeguarding the safety of industrial automation in China!