SKI-U1Z

Product Description

Home > Products > Bernstein > Safety Interlock Switches Need Bernstein SKI-U1Z M3X? Safety Interlock Switch for Machine Guarding, Safety Circuits. Supplied with full traceability and documentation. Request a... Price & Availability Part of the SKI series, this switch features a robust thermoplastic housing with a separate actuator (M3X) that ensures reliable operation in demanding environments. The switch is engineered to meet international safety standards, providing a positive-break NC contact that ensures circuit interruption even in the event of a spring failure. With an IP67 protection rating, it is resistant to dust and temporary immersion in water, making it suitable for washdown applications and harsh industrial settings. This model is equipped with 2 normally closed (NC) safety contacts and 1 normally open (NO) auxiliary contact, offering flexible wiring options for safety circuits and diagnostics. The switching element is a snap-action contact with a positive opening operation, ensuring high reliability. The actuator is designed with a coding feature to prevent bypassing, enhancing operator safety. The switch operates within a wide temperature range of -30°C to +80°C, accommodating various environmental conditions. The SKI-U1Z M3X is typically used for sliding, hinged, or removable guards on machinery such as packaging equipment, machine tools, and automated production lines. Its compact size (31mm x 31mm x 91mm) allows for easy integration into existing systems. The switch is available with a cable entry of M20x1.5, simplifying installation. As a genuine Bernstein product, it complies with EN 60947-5-1 and EN 1088 (now ISO 14119) standards, ensuring global acceptance. The Bernstein SKI-U1Z M3X is a compact safety interlock switch designed for position monitoring and guard locking in industrial machinery. Basic Product Information IP67 protection for harsh environments Compact design with M20x1.5 cable entry Coded actuator prevents bypassing Wide temperature range (-30°C to +80°C) 2NC + 1NO contact configuration Positive-break NC contacts for fail-safe operation Technical Specifications Version & Model Difference The SKI-U1Z M3X is part of the Bernstein SKI series, which includes various actuator options (e.g., M2, M3, M4) and contact configurations. The M3X actuator is a coded version, offering higher tamper resistance compared to non-coded actuators. Other versions may have different contact arrangements (e.g., 1NC+1NO) or cable entry sizes (e.g., M16). The U1Z designation indicates a specific contact block with 2NC+1NO, while other models like SKI-U1Z M2 have a different actuator shape. Always verify the exact actuator and contact configuration for your application. Application Scenarios Can the SKI-U1Z M3X be used in food processing environments? Yes, the IP67 rating and robust thermoplastic housing make it suitable for washdown and dusty environments. However, ensure that the materials are compatible with the cleaning agents used. Bernstein offers stainless steel versions for more aggressive environments. How do I install the actuator M3X? The actuator is mounted on the movable guard using the provided screws. The switch body is fixed to the stationary part. Proper alignment is crucial; the actuator must enter the switch opening without binding. Refer to the installation manual for exact dimensions and tolerances. Is the SKI-U1Z M3X compliant with safety standards? Yes, it complies with EN 60947-5-1 for control circuit devices and ISO 14119 (formerly EN 1088) for interlocking devices associated with guards. It is suitable for use in safety circuits up to PL d (ISO 13849-1) when properly integrated. What is the function of the positive-break NC contact? The positive-break (positive opening) NC contact ensures that the circuit is mechanically forced open when the actuator is removed, even if the contacts are welded. This provides a fail-safe signal to the safety circuit, preventing machine operation when the guard is open. Bernstein 60182000007 Safety Switch (SLK Series) Bernstein 3911742390 Safety Switch (SLK-M-2NC-M20)