Industrial Automation
In industrial automation, relays serve as a critical bridge connecting PLC control signals with field actuators, widely employed in scenarios such as motor control, safety interlocking, and actuator driving.
Motor Control
Key Requirement: Reliable switching and adaptability to various control voltages and frequencies.
Design Features:
Electromagnetic Relay：
Low cost and high versatility
Compatible with AC 220V, DC 24V, and other control voltages
Three-phase Solid-state Relay：
Contactless switching
Reduced mechanical wear
Long service life
Typical Application：
Start/stop and forward/reverse control of motors (Electromagnetic Relay)
High-frequency start/stop motor equipment (Solid-state Relay)
Safety Interlocking
Safety interlocking is a core requirement in industrial automation, used in safety devices such as guard doors, safety light curtains, and emergency stop buttons.
Key Requirement: Must comply with SIL 3 / PL e safety level
Design Features:
✅ Dual-channel redundancy design
✅ Forced-guided contacts
✅ Any single fault can cut off the hazardous circuit, preventing unintended machine operationRecommended Type: Safety Relay
Actuator Driving
Key Requirement: Precise and stable control of pneumatic components.
Design Features:
Signal Relay：
Compact size
Stable performance
Time-delay Relay：
Built-in delay function
Adjustable timing parameters
Typical Application：
Driving solenoid valves and cylinders (Signal Relay)
Process timing control and delayed action scenarios (Time-delay Relay)
Protection Functions
Key Requirement: Automatic detection and cutoff in case of abnormal motor operation.
Design Features:
Thermal Relay / Overload Protection Relay：
Responds to motor overcurrent and overload conditions
Automatically cuts off the power supply when the current exceeds the rated value
Typical Application：
Motor overload and overcurrent protection
Signal Isolation & Expansion
Key Requirement: Enhanced system noise immunity and extended control capacity.
Design Features:
Miniature Signal Relay / Coupling Relay：
Electrical isolation between control and load circuits
Signal amplification and multi-channel expansion
Typical Application：
PLC signal isolation and expansion
Improving system stability and anti-interference capability
