Allen-Bradley 440K-C21090 is a Cadet 3 safety interlock switch from the Bulletin 440K Trojan series, designed for guard door monitoring in industrial safety circuits. This unit features two normally open (N.O.) safety contacts rated for 10A at 600V, providing a positive-opening, mechanically linked switching mechanism for safety-related stop functions. It is engineered for applications requiring Category 4, PL e safety performance per ISO 13849-1 and SIL 3 per IEC 62061 standards.

# Electrical Safety Interlock Switch The **Allen Bradley 440K-C21090 Safety Interlock Switch** is a high-quality electrical component designed to enhance safety and operational efficiency in industrial automation applications. This robust switch is an essential part of safety systems, ensuring that machinery operates only when it is safe to do so. Engineered with precision, the 440K-C21090 offers reliable performance in demanding environments. ## Key Features • **Safety Functionality**: Designed for use in safety circuits, the switch helps to prevent unauthorized access to machine operation, ensuring compliance with industry safety standards. • **Durability**: Constructed from high-grade materials, the switch is built to withstand harsh industrial conditions, providing long-lasting reliability. • **Compact Design**: The Cadet 3 series features a compact footprint, making it easy to install in tight spaces while maintaining full functionality. • **Mechanical Actuation**: Equipped with a positive-opening mechanism, it guarantees that the contacts open safely and reliably, enhancing protection against unintended machine startups. • **Environmental Protection**: Rated IP67, the switch is protected against dust and water ingress, making it suitable for various industrial applications. ## Applications • **Industrial Automation**: Ideal for use in automated machinery and equipment, where safety interlocks are critical to prevent accidents. • **Manufacturing Operations**: Commonly used in assembly lines and production machinery, ensuring operators are safeguarded during machine operation. • **Safety Systems Integration**: Compatible with various safety relay and control systems, allowing for seamless integration into existing setups. ## Benefits • **Enhanced Safety**: Reduces the risk of accidents and injuries by ensuring machinery is inactive when access points are open. • **Increased Operational Efficiency**: Streamlines machine operation by preventing unauthorized use, thus maintaining productivity levels. • **Reliable Performance**: Built to rigorous standards, the switch delivers dependable operation, minimizing downtime and maintenance needs. --- *Product information compiled with AI assistance for reference purposes.*