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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3SK1211-1BW20 |
| Alternative Part Number | 3SK12111BW20 |
| Manufacturer | Siemens |
| Series | SIRIUS |
| Product Type | Safety Relay |
| Supply Voltage | 110 to 240 V ac/dc |
| Output Configuration | 4 Normally Open (NO) contacts |
| Terminal Type | Screw Terminal |
| Dimensions | 22.5 x 121.6 x 100 mm |
| Mounting Type | Screw and snap-on mounting |
| Operating Frequency Maximum | 360 operations/hour |
| Switching Capacity of NO Contacts | At 24 V DC: 5 A; At 115 V DC: 0.2 A |
| Insulation Voltage | Rated value 300 V |
| Ambient Operating Temperature | -25 to +60 °C |
| Storage Temperature | -40 to +80 °C |
| Protection Class | IP20 |
| Vibration Resistance | According to IEC 60068-2-6: 5 ... 500 Hz: 0.75 mm |
| Shock Resistance | 10g / 11 ms |
| Surge Voltage Resistance | Rated value 4,000 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 |
| PFHD | 0.0000000017 1/h according to EN 62061 |
| PFDavg | 0.000001 according to IEC 61508 |
| T1 Value | 20 years for proof test interval or service life according to IEC 61508 |
| Hardware Fault Tolerance (HFT) | 1 according to IEC 61508 |
| Safety Device Type | Type A according to IEC 61508-2 |
| Approvals | TÜV and UL approved |
The Siemens SIRIUS Series Safety Relay, part number 3SK1211-1BW20, is a sophisticated and reliable component designed for seamless integration into safety systems within industrial environments. This safety relay is an output expansion module that features four normally open (NO) contacts for relay enabling circuits, along with an additional normally closed (NC) contact for relay signalling purposes.
Crafted to operate with a supply voltage ranging from 110 to 240 V ac/dc, the 3SK1211-1BW20 ensures flexibility and compatibility with various power systems. The unit's screw terminal connection offers a secure and durable means of integrating the relay into existing setups.
With dimensions of 22.5 x 121.6 x 100 mm, this compact device is engineered to fit neatly into control panels without occupying excessive space, making it an ideal choice for applications where space is at a premium. The relay's enclosure is rated at IP20, providing a basic level of protection against solid objects and ensuring that the internal components are finger-safe.
The 3SK1211-1BW20 is designed to meet stringent safety standards, boasting a Safety Integrity Level (SIL) of 3 according to IEC 61508, a Performance Level (PL) of e to EN ISO 13849-1, and a Category 4 according to EN ISO 13849-1. These certifications underscore the relay's capability to function as a critical part of a safety system, helping to manage and mitigate risks in industrial processes.
This safety relay is suitable for Class A environments only, as it may cause undesired radio-frequency interference in residential settings. In such cases, appropriate measures must be taken to prevent interference.
The Siemens SIRIUS Series Safety Relay is a testament to Siemens' commitment to quality, reliability, and safety in industrial automation. It is an essential component for those seeking to enhance the safety and functionality of their control systems.
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Frequently Asked Questions
What is the voltage range for this safety relay?
The safety relay operates within a voltage range of 110 to 240 V ac/dc, making it versatile for various power supply conditions.
Can you describe the terminal type of this relay?
This relay features a screw terminal connection, which provides a secure and reliable means of connecting wires.
What is the size of this safety relay?
The dimensions of the safety relay are 22.5 x 121.6 x 100 mm, which is a standard size for easy integration into control panels.
What type of contacts does this relay have?
The relay is equipped with 4 normally open (NO) contacts for output expansion and 1 normally closed (NC) contact for relay signalling circuits.
What is the insulation voltage rating for this device?
The insulation voltage rated value for this device is 300 V.
What are the environmental operating conditions for this relay?
The relay can operate within an ambient temperature range of -25 to +60 °C and can be stored in temperatures ranging from -40 to +80 °C. It's also designed to withstand an installation altitude of up to 2,000 metres above sea level.
What is the protection class of the enclosure?
The enclosure of this safety relay is rated at IP20, which means it is protected against solid objects larger than 12.5 mm but not against water.
What is the maximum operating frequency of this relay?
The maximum operating frequency for the relay's NO contacts is 360 operations per hour.
What certifications does this safety relay comply with?
This safety relay complies with EMC Class A standards, indicating it is suitable for industrial environments but may cause radio-frequency interference in residential areas.
What safety categories does this relay meet?
The relay meets Safety Integrity Level (SIL) 3, Performance Level (PL) e, and Category 4 according to EN ISO 13849-1, making it suitable for high safety requirements.
