PRODUCT DESCRIPTION
SIEMENS 3SK1220-2AB40 - Safety Relay
This SIEMENS SIRIUS 3SK1 safety relay, model 3SK1220-2AB40, is a compact basic unit engineered for the monitoring and evaluation of safety-related circuits in industrial automation. It processes signals from E-STOP devices, safety gates, and light curtains, providing protective shutdown functions. The unit is designed to achieve Safety Integrity Level (SIL) 3 per IEC 61508 and Performance Level (PL) e per ISO 13849-1, making it suitable for critical machine safety applications.
Technical Specifications:
- SERIES/FAMILY: SIRIUS 3SK1
- COMPONENT TYPE: Safety Relay, Basic Unit
- ELECTRICAL SPECS:
- NOMINAL SUPPLY VOLTAGE: 24V DC
- OPERATING VOLTAGE RANGE: 20.4V DC to 28.8V DC
- POWER CONSUMPTION: Approximately 2.5W
- NUMBER OF ENABLING CURRENT PATHS: 2 (Normally Open contacts)
- NUMBER OF AUXILIARY CURRENT PATHS: 1 (Normally Closed contact)
- RATED OPERATIONAL CURRENT (ENABLING PATHS): 5A at 230V AC (AC-15), 3A at 24V DC (DC-13)
- RATED OPERATIONAL CURRENT (AUXILIARY PATHS): 3A at 230V AC (AC-15), 1A at 24V DC (DC-13)
- MECHANICAL/PHYSICAL:
- FORM FACTOR: Compact, modular enclosure
- TERMINAL TYPE: Screw terminals
- WIDTH: 22.5 mm (standard for 3SK1220 series)
- INTERFACE/CONTROL:
- INPUTS: 1 or 2-channel monitoring for safety sensors (e.g., E-STOP, safety gate, light curtain)
- OUTPUTS: Safety-related outputs (enabling paths), auxiliary output for signaling
- RESET FUNCTION: Automatic or monitored start (manual reset)
- ENVIRONMENTAL/MOUNTING:
- IP RATING: IP20 (terminals), IP40 (enclosure)
- MOUNTING STYLE: DIN rail 35 mm
- OPERATING TEMPERATURE: -25 °C to +60 °C
- STORAGE TEMPERATURE: -40 °C to +85 °C
- COMPATIBILITY/APPLICATION:
- SAFETY INTEGRITY LEVEL (SIL): Up to SIL 3 according to IEC 61508
- PERFORMANCE LEVEL (PL): Up to PLe according to ISO 13849-1
- TARGET APPLICATIONS: Emergency stop circuits, safety gate monitoring, light curtain monitoring, two-hand control, pressure-sensitive mats in machine building, robotics, material handling, and process industries.