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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3SK1121-1CB42 |
| Alternative Part Number | 3SK11211CB42 |
| Manufacturer | Siemens |
| Product Type | Safety Relay |
| Supply Voltage | 24 V dc |
| Monitoring Functions | Sensor Floating Monitoring |
| Output Configuration | 2 Normally Open (NO) |
| Connection Type | Screw |
| Mounting Options | Screw Mount; Snap-On Mount |
| Dimensions | 22.5 x 121.7 x 100 mm |
| Time Delay Range | 0.5-30 seconds |
| Insulation Voltage | Rated at 300 V |
| Ambient Operating Temperature Range | -25 to +60 °C |
| Protection Class | IP20 |
| Vibration Resistance | 5 to 500 Hz at 0.75 mm |
| Shock Resistance | 10g / 11 ms |
| Surge Voltage Resistance | Rated at 4000 V |
| EMC | Suitable for Class A environments, can cause radio-frequency interference in residential areas |
| Safety Integrity Level (SIL) | SIL3 |
| Performance Level (PL) | e |
| Category according to EN ISO 13849-1 | 4 |
| Safe Failure Fraction (SFF) | 99 % |
| Hardware Fault Tolerance | According to IEC 61508-1 |
| Safety Device Type | Type B according to IEC 61508-2 |
The Siemens 3SK1121-1CB42 is a state-of-the-art safety relay from the SIRIUS range, designed to offer reliable protection and monitoring for a variety of industrial applications. This advanced unit is equipped with time delay functionality ranging from 0.5 to 30 seconds, allowing for tailored safety operations. It operates with a control supply voltage of 24 V dc, ensuring compatibility with standard industrial control systems.
Crafted for autonomous safety applications, the 3SK1121-1CB42 boasts an IP20 enclosure protection class, providing a degree of protection against solid objects. This safety relay is finger-safe, minimising the risk of electrical shock during operation or maintenance. With an insulation voltage rated at 300 V, it is built to withstand the rigours of industrial environments.
The unit is designed for flexibility in installation, with both screw and snap-on mounting options, and can be positioned in any orientation. It measures 22.5 mm in width, 100 mm in height, and 121.6 mm in depth, making it a compact solution for space-constrained scenarios.
The 3SK1121-1CB42 is capable of single-channel and two-channel sensor connections, with a parameterisable function for sensor floating/non-floating, monitored start/autostart, and cross-circuit detection. It also supports startup testing, antivalent sensors, and two-hand switches, enhancing its versatility.
For output, it features two safety-related instantaneous contacts and two safety-related delayed switching contacts, ensuring immediate and delayed responses as required by the application. The relay is designed to handle a variety of safety functions, including safety switch monitoring, floating sensor monitoring, and non-floating sensor monitoring, making it an essential component for safeguarding machinery and personnel.
In summary, the Siemens 3SK1121-1CB42 is a robust and versatile safety relay that offers advanced features for industrial safety management, ensuring operations are conducted with the utmost precision and care.
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Frequently Asked Questions
What are the key features of this safety relay?
This safety relay is part of the SIRIUS safety relay Basic unit Advanced series and features a time delay function ranging from 0.5 to 30 seconds. It is designed for sensor floating monitoring with two normally open (NO) contacts and offers both screw and snap-on mounting options. The dimensions are 22.5 x 121.7 x 100 mm, making it suitable for compact installations.
Can this safety relay be used with different types of sensors?
Yes, the safety relay is versatile and can be configured to work with either two single-channel sensors or one double-channel sensor, providing flexibility in connecting various types of safety devices.
What type of power supply is required for this safety relay?
The safety relay operates with a 24 V dc power supply, which is a common voltage level for control systems in industrial environments.
Is there any specific mounting requirement for this relay?
The relay offers flexibility in mounting with both screw and snap-on options available. It can be easily integrated into control panels or machinery with standard mounting practices.
What is the significance of the time delay feature in this relay?
The time delay feature allows for adjustable delay times between 0.5 and 30 seconds, which can be crucial for coordinated safety functions where a specific timing sequence is required for safe operation.
How does the cross fault detection feature enhance safety?
Cross fault detection is a safety feature that checks for faults in the relay's internal logic. If a cross fault is detected, the relay will not allow the system to restart until the fault is cleared, thus enhancing the overall safety of the system.
What are the dimensions of this safety relay?
The dimensions of the safety relay are 22.5 mm in width, 121.7 mm in height, and 100 mm in depth, which conforms to standard sizes for easy integration into control systems.
How does the monitored start function work?
The monitored start function ensures that the safety relay checks for safe conditions before allowing the system to start. This means that all connected safety devices must be in a safe state before the relay will enable the system to operate.
