Solenoid Locking Switches
Introduction Overview of Solenoid Switches Solenoid switches, specifically solenoid interlock switches and solenoid controlled safety interlock switches, are critical components in industrial automation systems. These…
-
Introduction
Overview of Solenoid Switches
Solenoid switches, specifically solenoid interlock switches and solenoid controlled safety interlock switches, are critical components in industrial automation systems. These switches are designed to secure movable guards, control access to dangerous equipment, and prevent unauthorised entry during operation. Available in various body types, including stainless steel, compact metal body, and die-cast metal, they are engineered for long-lasting operations in harsh environments.
Importance in Industrial Safety
Solenoid interlocks are used across high-performance safety applications, ensuring enhanced safety in hazardous environments like packaging equipment, beverage processing machinery, and automated warehousing. With features such as positive opening safety contacts, LED diagnostics, and dual-channel safety monitoring, these switches support a safe working environment and align with applicable machine safety standards including IEC 60947 and EN ISO 14119.
Types of Solenoid Safety Switches
Solenoid Locking Switches
Solenoid locking switches provide mechanical lock mechanisms to prevent unsafe operations. Options include power-to-lock and power-to-unlock models, ensuring compatibility with systems requiring different power supply setups (e.g., 24–240 VAC/DC). They support risk assessment frameworks by offering reliable lock status feedback and protection against unexpected start-up.
Fortress Bolt Solenoid Safety Switches
These switches are ideal for dual-channel safety monitoring relays and channel safety monitoring, offering secure interlock even under solenoid power loss. Their internal solenoids and switch mechanisms allow fast response during routine operation or emergency stops. High mechanical life and rugged enclosure protection make them well-suited for industrial environments.
Solenoid Interlock Switches
Solenoid interlock switches are designed for use with hinged machine guards, sliding doors, and removable machine guards. Their tamper-resistant cam interlock mechanisms, along with options for actuator entry positions, separate actuators, and rotatable heads, ensure flexible installation across a range of solenoid locking applications.
Safety Solenoid Switches
Designed for regular entry and actuator position verification, these switches offer diagnostic feedback, safety outputs, and options for IO-Link Safety and Safety Data Communications. Their robust positions, degree cable entry systems, and compact housings help reduce cabling costs and support customisable solutions for varied industry applications.
Key Manufacturers and Products
IDEM Safety Switches
IDEM’s range includes Solenoid Controlled RFID Safety Interlock Switches and non-contact RFID locking switches with options like Anti-tamper tongue technology and KLT-SS designs. Their solutions provide controlled access, real-time status feedback, and ergonomic actuators, making them a top choice for pharmaceutical manufacturing and motor-driven systems.
Schmersal Range
The Schmersal EX-AZM 161SK and related models are ideal for pressurised sites and dangerous processes, offering interlock with protection against incorrect locking, modular connection ports, and auxiliary contacts. Their range covers both solenoid guard locking switches and tongue safety switches, meeting strict explosion safety requirements.
Applications in Industrial Environments
Enhancing Operational Safety
These switches help prevent unauthorised access and operation of machinery during hazardous states. They are commonly used in automation systems, automotive battery manufacturing, and control boxes for electricity metering systems.
Optimizing Production Lines with Sensors
Solenoid switches integrated with safety timers, control stations, and customisable operator controls ensure precise control of access to dangerous equipment. Integration with safety relays and safety device networks allows for continuous monitoring of lock status and gate position.
Explosion Safety and ATEX Standards
In high-risk industrial automation applications, solenoid interlocks provide protection against defeat, lock monitoring, and compliance with ATEX standards. Their stainless-steel bodies and IP-rated enclosures support operation in high-temperature environments, offering levels of protection against dust, water, and impact.
Specialized Accessories and Innovations
Accessories for Enhanced Functionality
A complete range of accessories—including dual tongue entry points, connectors, modular actuator heads, and bracket kits—ensures adaptation to unique machinery setups. These enhance compatibility with aluminium profiles and fencing, slim housings, and enclosure ratings.
Safety Innovations: Smallest Safety Laser Scanner
Some manufacturers now offer self-monitoring series-wiring and serial diagnostics that work with solenoid interlock switches for advanced system feedback. Combined with safety laser scanners, these systems allow for intelligent diagnostics and minimal rundown time, suitable for sized spaces and modular safety zones.
Case Studies
Control Box Assembly for Industrial Electricity Metering
A national metering firm deployed a solenoid interlock solution using EX-AZM models and dual-channel safety monitoring relays to protect workers in high-voltage electricity metering systems. The solution included pre-wired units, control boxes, and guard lock monitoring, with customisable options based on gate type and actuator position, ensuring safe and dependable operation throughout the entire product range.
