PRODUCT DESCRIPTION
SIEMENS 3SK1121-2CB42 - Safety Relay Basic Unit
This SIEMENS SIRIUS 3SK1 safety relay basic unit is engineered for monitoring safety functions in industrial automation systems. It provides reliable control for emergency stop circuits, safety gates, and light curtains, ensuring compliance with international safety standards up to Safety Integrity Level 3 (SIL 3) and Performance Level e (PL e). The unit integrates into control panels via DIN rail mounting, offering robust protection for personnel and machinery in critical applications.
Technical Specifications:
- SERIES/FAMILY: SIRIUS 3SK1
- COMPONENT TYPE: Safety Relay Basic Unit
- ELECTRICAL SPECS:
- NOMINAL SUPPLY VOLTAGE: 24V DC
- SAFETY OUTPUTS: 4 Normally Open (NO) relay contacts
- AUXILIARY OUTPUTS: 1 Normally Closed (NC) relay contact
- INPUTS: 2-channel for safety circuits
- RATED OPERATIONAL CURRENT (OUTPUTS): 5A at 230VAC / 24VDC
- MECHANICAL/PHYSICAL:
- MOUNTING: DIN rail
- TERMINALS: Screw terminals
- FORM FACTOR: Compact modular enclosure
- INTERFACE/CONTROL:
- RESET FUNCTION: Manual or automatic reset capability
- DIAGNOSTICS: LED indicators for status and fault diagnosis
- ENVIRONMENTAL/MOUNTING:
- IP RATING: IP20 (terminals), IP40 (enclosure front)
- OPERATING TEMPERATURE: -25 to +60 degrees Celsius
- COMPATIBILITY/APPLICATION:
- SAFETY STANDARDS: Conforms to IEC 61508 (SIL 3), ISO 13849-1 (PL e), IEC 60947-5-1
- APPLICATIONS: Emergency stop monitoring, safety gate monitoring, light curtain monitoring, two-hand control, enabling switch monitoring in machinery and plant engineering.