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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3SK1211-2BB40 |
| Alternative Part Number | 3SK12112BB40 |
| Manufacturer | Siemens |
| Product Type | Extension Safety Relay Module |
| Suitable for | Safety Programmable Controllers |
| Contact Configuration | 4 NO (Normally Open) contacts, 1 NC (Normally Closed) feedback circuit |
| Supply Voltage | 24 V dc |
| Operating Frequency Maximum | 360 1/h |
| Switching Capacity Current | 5 A at 24 V dc (DC-13), 0.2 A at 115 V dc, 0.1 A at 230 V dc |
| Insulation Voltage Rated Value | 300 V |
| Ambient Operating Temperature Range | -25 ... +60 °C |
| Storage Temperature Range | -40 ... +80 °C |
| Protection Class IP | IP20 |
| Insulation | Finger-safe |
| Mounting Position | Any |
| Mounting Type | Screw and snap-on mounting |
| Width | 22.5 mm |
| Height | 100 mm |
| Depth | 121.6 mm |
| Connection Type | Spring-loaded terminal (push-in) |
| 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 | 1.7E-9 1/h according to EN 62061 |
| PFDavg | 1E-6 according to IEC 61508 |
| T1 Value for Proof Test Interval | 20 years according to IEC 61508 |
| Hardware Fault Tolerance | 1 according to IEC 61508 |
| Safety Device Type | Type A according to IEC 61508-2 |
| EMC | Suitable for Class B environments, can also be used in domestic environments |
| Overvoltage Category | 3 |
| Degree of Pollution | 3 |
| Vibration Resistance | 5 ... 500 Hz: 0.75 mm according to IEC 60068-2-6 |
| Shock Resistance | 10g / 11 ms |
| Surge Voltage Resistance | Rated value 4,000 V |
The Siemens 3SK1211-2BB40 is a sophisticated extension safety relay module designed to enhance the functionality of safety programmable controllers. This module is an integral component for various industrial applications where safety and reliability are paramount. With a compact design measuring 22.5 x 121.7 x 100 mm, it is engineered to fit seamlessly into control panels without occupying excessive space.
Equipped with four normally open (NO) contacts for safety-related instantaneous switching, the module ensures a high level of safety for machinery and operators alike. It also includes a relay feedback circuit with one normally closed (NC) contact, providing a reliable means of status monitoring for safety systems.
The 3SK1211-2BB40 operates at a control supply voltage of 24 V DC, making it compatible with a wide range of control systems. It boasts an impressive mechanical service life of typically 10 million operating cycles, indicating a long-lasting and durable performance in demanding industrial environments.
This module is designed for any mounting position, offering flexibility in installation, and it features a spring-loaded terminal (push-in) connection type for quick and secure wiring. With an insulation voltage rated at 300 V and a protection class of IP20, the unit is safeguarded against electrical interference and offers finger-safe protection against electrical shock.
The safety relay module is compliant with a variety of international standards, including a Safety Integrity Level (SIL) of 3 according to IEC 62061 and IEC 61508, and a Performance Level (PL) of e according to ISO 13849-1. It also falls under Category 4 according to EN ISO 13849-1, reflecting its capability to perform at the highest level of safety for control systems.
In summary, the Siemens 3SK1211-2BB40 is a reliable and efficient solution for expanding the output capabilities of safety control systems, ensuring both the protection of personnel and machinery in a wide array of industrial settings.
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Frequently Asked Questions
What is the function of this extension safety relay module?
The extension safety relay module is designed to expand the output capacity of safety programmable controllers. It provides additional relay outputs for enabling circuits and feedback circuits, enhancing the control and safety features of a system.
Can this safety relay module be used in domestic environments?
Yes, this safety relay module is suitable for Class B environments, which means it can also be used in domestic settings.
What type of connections does this module support?
The module supports spring-type terminal connections, also known as push-in connections, which allow for quick and secure wiring without the need for tools.
What is the maximum operating altitude for this module?
The maximum operating altitude for the module is 2,000 metres above sea level. Beyond this altitude, derating may be necessary.
What are the ambient temperature limits for the operation of this module?
The module can operate within an ambient temperature range of -25 to +60 degrees Celsius during operation, and it can be stored in temperatures ranging from -40 to +80 degrees Celsius.
What is the insulation voltage rating for this safety relay module?
The insulation voltage rated value for this module is 300 V.
What is the significance of the SIL and PL ratings for this module?
The Safety Integrity Level (SIL) and Performance Level (PL) ratings indicate the reliability and safety performance of the module. A SIL3 and PL e rating signify that the module meets high safety requirements for use in systems that require a high level of risk reduction.
What is the maximum switching capacity for the NO contacts of the relay outputs?
The maximum switching capacity for the Normally Open (NO) contacts of the relay outputs is 5 A at 24 V for DC-13 and 5 A at 24 V, 115 V, and 230 V for AC-15.
How does the module protect against electrical shock?
The module is designed with finger-safe terminals to protect against electrical shock, ensuring a safer installation and maintenance process.
What is the mechanical service life of the relay contacts?
The mechanical service life of the relay contacts is typically 10 million operating cycles, indicating the module's durability and longevity.
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