Product Overview
The SIEMENS 3SF1324-1SD21-1BA1 is a high-performance safety position switch with solenoid interlock, engineered for position monitoring of movable protective devices in industrial machinery. As part of the SIRIUS 3SF1 series, the SIEMENS 3SF1324-1SD21-1BA1 features a robust plastic enclosure with a tumbler actuator design and offers five directions of approach, providing flexible installation options for diverse machine guarding applications . This safety switch integrates ASIsafe communication technology, allowing direct connection to AS-Interface bus systems for safety-oriented data transmission and diagnostics, making it a key component for modern safety automation architectures .
The SIEMENS 3SF1324-1SD21-1BA1 delivers a locking force of 1300 N with spring-actuated (quiescent current principle) solenoid locking, ensuring reliable protection against unauthorized access to hazardous machine areas . Equipped with a 24 V AC/DC solenoid, the SIEMENS 3SF1324-1SD21-1BA1 operates without requiring an additional power supply, simplifying installation and reducing wiring complexity. This model features a contact configuration of 1 NC for the actuator channel and 1 NC for the magnet channel, with an auxiliary release mechanism located on the front of the device for emergency unlocking situations . The SIEMENS 3SF1324-1SD21-1BA1 also includes integrated status LEDs and can achieve SIL 1 or PL c safety levels depending on the evaluation architecture, offering a reliable foundation for safety functions up to SIL 3 or PL e when used within a properly designed ASIsafe system .
Technical Specifications
| Parameter Name | Value |
|---|---|
| Product Model | 3SF1324-1SD21-1BA1 |
| Manufacturer | Siemens AG |
| Product Type | Safety Position Switch with Solenoid Interlock |
| Locking Force | 1300 N (1000 N per GS-ET 19) |
| Enclosure Material | Plastic |
| Enclosure Width | 54 mm |
| Actuator Type | Tumbler with 5 directions of approach |
| Guard Locking Principle | Spring-actuated (Quiescent Current) |
| Solenoid Voltage | 24 V AC/DC |
| Contact Configuration (Actuator / Magnet) | 1 NC / 1 NC |
| Electrical Connection | M12 Plug Connection |
| Communication Interface | AS-Interface, ASIsafe Integrated |
| Safety Level (Attainable) | SIL 1 / PL c |
| Degree of Protection | IP66 / IP67 |
| Operating Temperature | -25°C to +60°C |
| Net Weight | Approx. 0.52 – 0.54 kg |
| Auxiliary Release | Yes (Front Mounted) |
| Status Indication | 4 LEDs (AS-i, FAULT, F-IN1, F-IN2) |
| Lifecycle Status | Active (PM300) |
| Country of Origin | Germany |
| RoHS Compliant | Since 01.03.2017 |
Main Features and Advantages
Integrated ASIsafe Communication: The SIEMENS 3SF1324-1SD21-1BA1 features fully integrated ASIsafe electronics that enable direct, safe communication over the AS-Interface bus system . This integration allows the SIEMENS 3SF1324-1SD21-1BA1 to transmit safety-related signals and diagnostic data without requiring complex point-to-point wiring, significantly reducing installation time and material costs. The built-in ASIsafe capability supports safety functions up to SIL 3 or PL e when paired with an appropriate AS-i safety monitor or DP/AS-i F-Link, making the SIEMENS 3SF1324-1SD21-1BA1 suitable for high-risk machinery applications .
Robust Guard Locking Mechanism: The SIEMENS 3SF1324-1SD21-1BA1 delivers a powerful 1300 N locking force, ensuring that protective doors and guards remain securely closed during machine operation . This spring-actuated (quiescent current principle) locking mechanism provides fail-safe operation: the guard remains locked even in the event of power loss, preventing access to hazardous areas until the solenoid is deliberately energized. The SIEMENS 3SF1324-1SD21-1BA1 is designed with a slow-action switching contact, ensuring reliable and precise switching performance over its operational life.
Flexible Installation and Environmental Durability: The SIEMENS 3SF1324-1SD21-1BA1 offers five directions of approach, providing maximum flexibility for machine builders and integrators facing space constraints or complex mounting requirements . With an IP66/IP67 degree of protection and an operating temperature range of -25°C to +60°C, the SIEMENS 3SF1324-1SD21-1BA1 is built to withstand harsh industrial environments, including exposure to dust, moisture, and temperature extremes . The plastic enclosure provides a lightweight yet durable housing suitable for a wide range of applications.
Comprehensive Diagnostics and Emergency Release: The SIEMENS 3SF1324-1SD21-1BA1 features four status LEDs (AS-i, FAULT, F-IN1, F-IN2) providing clear visual indication of device status, network communication, and safety channel conditions, enabling rapid troubleshooting and minimizing downtime . The front-mounted auxiliary release mechanism allows authorized personnel to manually unlock the guard in emergency situations, enhancing safety and operational flexibility. The matching separate actuator (order number 3SE5000-0AV0 or -0AW5) must be ordered separately to complete the interlock system .
