Product Overview

The SICK UE402 is a Type 4 safety light curtain designed to provide reliable protection in industrial environments. As part of SICK’s C4000 series, it meets IEC 61496-1 standards for safety-related electrical equipment and offers long-term operational reliability with a mission time of 20 years as defined by EN ISO 13849. The UE402 is engineered for robust performance in demanding applications where safe machine guarding is essential. With a compact design, plastic housing, and fixed screw terminals, it ensures easy installation while maintaining high safety integrity. Its compliance with IEC 61140 protection class III makes it suitable for use in hazardous environments. The device supports operational mode switching and is certified under EC-Type-Examination, ensuring regulatory compliance across markets.

Key Features and Technology

The UE402 leverages Type 4 safety technology (IEC 61496-1) to ensure high reliability in safety-critical applications. It features a mission time of 20 years, as per EN ISO 13849, providing long-term confidence in performance without frequent maintenance. The sensor operates with precise switching thresholds: an ON state at 24 V DC (11 V DC to 30 V DC) and OFF state at –30 V DC to 5 V DC, ensuring accurate detection under varying conditions. Input current ranges are optimized for stability—6 mA to 20 mA in the HIGH state and –3 mA to 0.5 mA in the LOW state—ensuring consistent signal integrity. The device supports operational mode switching, allowing flexible configuration during operation. With a plastic housing and fixed screw terminals, it offers durability and ease of integration into existing safety systems.

Technical Characteristics

The SICK UE402 has dimensions of 22.5 mm (width) × 99 mm (height) × 114.5 mm (depth), with a unit weight of 0.215 kilograms. It operates within an ambient temperature range of 0 °C to +55 °C and can be stored from –25 °C to +70 °C. The supply voltage is 24 V DC, operating between 19.2 V DC and 28.8 V DC, with a residual ripple of up to 10%. Protection class III (IEC 61140) ensures safety in hazardous environments. Enclosure rating IP20 provides basic protection against solid objects and dust. The device is designed for use with external power supplies that can buffer brief mains voltage failures of up to 20 ms, as specified in EN 60204-1. SICK offers compatible accessories to meet these requirements.

Configuration and Integration

The UE402 integrates seamlessly into safety systems through fixed screw terminals for secure wiring. It is fully compatible with the C4000 safety light curtain family, enabling interoperability across SICK’s safety product line. The device supports operational mode switching, allowing users to adjust its behavior during operation without hardware changes. Input signals are defined by precise voltage and current ranges: HIGH state (24 V DC, 6–20 mA) and LOW state (–30 V DC to 5 V DC, –3 mA to 0.5 mA). This ensures compatibility with a wide range of control systems while maintaining safety integrity. No additional interface modules are required for basic operation. Installation is straightforward due to the compact design and standardized terminal connections.

Operating Environment

The SICK UE402 is designed for reliable performance in industrial environments with ambient operating temperatures ranging from 0 °C to +55 °C. It can be stored under extreme conditions, from –25 °C to +70 °C, ensuring availability even in harsh climates. The device operates within a defined voltage range of 19.2 V DC to 28.8 V DC at the supply terminal (VS), with a residual ripple of up to 10%. Its IP20 enclosure rating provides protection against solid objects larger than 12.5 mm, but does not offer dust or moisture resistance. The device is suitable for use in environments where stable power conditions are maintained and where external voltage supplies meet EN 60204-1 requirements for brief mains failures (up to 20 ms).

Industrial Applications

The SICK UE402 is ideal for use in industrial automation applications requiring safe guarding of moving parts, such as in packaging, material handling, and assembly lines. Its Type 4 safety classification ensures compliance with international standards for machine safety. It can be deployed in environments where personnel access must be restricted during operation, such as in robotic arms or automated conveyors. The device’s compatibility with the C4000 series allows integration into existing safety networks. Its robust design and long mission time (20 years) make it suitable for continuous-duty operations in manufacturing and processing facilities where reliability is critical.