The Wieland Electric SNO 4003K is a safety switching device designed for monitoring emergency stop functions and safety gates in industrial applications. It operates as a single-channel switching device with self-monitoring capabilities during each ON-OFF cycle, ensuring immediate interruption of the power supply in hazardous situations (Stop Category 0 according to EN 60204-1). The module is equipped with positively driven relays and complies with safety standards up to Category 4 as per EN 954-1.

Key Features:

• Single-Channel Monitoring: Suitable for applications requiring single-channel emergency stop or safety gate monitoring.

• Self-Monitoring: Performs self-checks on each ON-OFF cycle to ensure system integrity.

• Manual or Automatic Start: Offers flexibility with both manual reset (with or without monitoring) and automatic start options.

• Multiple Enabling Current Paths: Provides three enabling current paths (NO contacts) and one signaling current path (NC contact) for versatile integration.

• Feedback Loop: Includes a feedback loop for monitoring external contactors, enhancing overall system safety.

Technical Specifications:

• Model Number: SNO 4003K

• Rated Voltage: Available in AC/DC 24 V, AC 115–120 V, and AC 230 V variants

• Power Consumption: 1.3 W (DC 24 V), 1.8 W / 3.2 VA (AC 115–120 V), 2.0 W / 2.3 VA (AC 230 V)

• Safety Category: Up to Category 4 according to EN 954-1

• Stop Category: 0 according to EN 60204-1

• Enabling Current Paths: 3 NO contacts

• Signaling Current Path: 1 NC contact

• Mounting: DIN rail mounting

• Dimensions: 22.5 mm (W) x 114 mm (H) x 107.6 mm (D)

• Weight: Approximately 210 g

Applications:

• Industrial Safety Systems: Ensures immediate power disconnection in emergency situations, protecting personnel and machinery.

• Safety Gate Monitoring: Monitors the status of safety gates, preventing machine operation when gates are open or not properly secured.

• Emergency Stop Circuits: Integrates into emergency stop circuits to provide reliable and immediate response during emergencies.

Wieland Electric - SNO 4003K - Emergency Stop and Safety Gate Monitor