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3SK1122-1CB42
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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3SK1122-1CB42 |
| Alternative Part Number | 3SK11221CB42 |
| Manufacturer | Siemens |
| Series | SIRIUS |
| Product Type | Safety Relay |
| Supply Voltage | 24 V dc |
| Number of Channels | 1-Channel |
| Output Configuration | 2 Normally Open (NO) |
| Dimensions | 22.5 x 121.7 x 100 mm |
| Mounting Type | Screw and snap-on mounting |
| Connection Type | Screw-type terminals |
| Conductor Cross-Section | Solid: 1x (0.5 ... 2.5 mm²), 2x (1.0 ... 1.5 mm²); Stranded: 1x (20 ... 16), 2x (20 ... 16) |
| Enclosure Protection | IP20 |
| Insulation Voltage | Rated value 50 V |
| Ambient Operating Temperature | -25 ... +60 °C |
| Storage Temperature | -40 ... +80 °C |
| Relative Humidity | 10 ... 95 % |
| Installation Altitude | Up to 2,000 m above sea level |
| Vibration Resistance | 5 ... 500 Hz: 0.75 mm |
| Shock Resistance | 10g / 11 ms |
| Surge Voltage Resistance | Rated value 800 V |
| EMC | Suitable for Class A environments only |
| Safety Integrity Level (SIL) | SIL3 according to IEC 61508 |
| Performance Level (PL) | e according to EN ISO 13849-1 |
| Category | 4 according to EN ISO 13849-1 |
| Safe Failure Fraction (SFF) | 99 % |
| PFHD | 0.0000000015 1/h |
| PFDavg | 0.000007 |
| T1 Value | 20 years |
| Hardware Fault Tolerance | 1 according to IEC 61508 |
| Safety Device Type | Type B according to IEC 61508-2 |
The Siemens SIRIUS Series Safety Relay, part number 3SK1122-1CB42, is a state-of-the-art control device designed to enhance the safety of machinery and plant operations. This compact and reliable unit is engineered to meet stringent safety requirements, making it an essential component for a wide range of industrial applications.
With a 24 V dc operating voltage, the relay is equipped with 1-channel monitoring capability and offers 2 normally open (NO) contacts. Its dimensions are 22.5 x 121.7 x 100 mm, allowing for easy integration into existing systems without the need for significant modifications.
The safety relay is designed for single-channel and two-channel wiring configurations, providing flexibility in connection and ensuring compatibility with various types of safety sensors and switches. It also features cross-circuit detection and an integrated startup test function, which contribute to the overall safety and reliability of the system it is part of.
The 3SK1122-1CB42 is characterised by its parameterisable product functions, including sensor monitoring, autostart, and time delay settings, which can be adjusted to suit specific application requirements. This adaptability makes it a versatile choice for monitoring safety functions such as emergency stops, protective doors, light curtains, and two-hand controls.
Constructed with finger-safe terminals and an IP20 protection class, the relay ensures user safety during installation and maintenance. It is suitable for Class A environments and is designed to prevent undesired radio-frequency interference in residential areas.
This safety relay is an integral component for those seeking to maintain high levels of safety while ensuring operational efficiency and compliance with international safety standards.
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Frequently Asked Questions
What is the voltage rating for this safety relay?
The safety relay operates at a voltage rating of 24 V dc.
Can you describe the safety relay's switching capability?
This safety relay features electronic enabling circuits with 2 normally open (NO) instantaneous contacts and 2 NO delayed contacts.
What are the dimensions of the safety relay?
The dimensions of the safety relay are 22.5 mm in width, 121.7 mm in height, and 100 mm in depth.
What is the IP rating of this safety relay?
The safety relay has an IP20 protection class, ensuring protection against solid objects larger than 12.5 mm but not against liquids.
What is the ambient operating temperature range for this relay?
The relay is designed to operate within an ambient temperature range of -25 to +60 degrees Celsius.
What is the significance of the SIL rating for this relay?
The Safety Integrity Level (SIL) rating indicates the reliability of the safety functions performed by the relay. This relay has a SIL3 rating, which is suitable for high-risk applications.
What is the Performance Level (PL) of this safety relay?
The Performance Level (PL) for this relay is rated at PL e, which is the highest level of risk reduction achievable by safety-related parts of control systems.
Can this safety relay be used for single-channel and two-channel wiring?
Yes, the safety relay supports both single-channel and two-channel safety-related wiring of the inputs.
What is the maximum installation altitude for this relay?
The maximum installation altitude for the relay is 2,000 metres above sea level.
Does this safety relay have a time delay feature?
Yes, the relay includes a time delay feature with a range of 0.5 to 30 seconds.
