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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3SK1121-2AB40 |
| Alternative Part Number | 3SK11212AB40 |
| Manufacturer | Siemens |
| Category | Soft Starts |
| Series | 3SK1 |
| Type | Safety Relay |
| Supply Voltage | 24 V dc |
| Channels | 1 Channel |
| Contacts Configuration | 1NC/3NO |
| Number of Contacts | 2 Contacts |
| Dimensions | 22.5 x 100 x 121.6 mm |
| Mounting Type | Screw and snap-on mounting |
| Connection Type | Spring-loaded terminal (push-in) |
| Safety Integrity Level (SIL) | SIL3 |
| Performance Level (PL) | e |
| Category according to EN ISO | 13849-1 Category 4 |
| Safe Failure Fraction (SFF) | 99% |
| PFHD | 0.0000000025 1/h |
| PFDavg | 0.000007 |
| T1 Value for Proof Test Interval | 20 years |
| Hardware Fault Tolerance | 1 |
| Safety Device Type | Type B |
| EMC | Suitable for Class A environments only |
| Overvoltage Category | 3 |
| Degree of Pollution | 3 |
| Ambient Operating Temperature | -25 to +60 °C |
| Protection Class | IP20 |
| Insulation Voltage | Rated value 300 V |
| Power Loss | Maximum 2 W |
The Siemens 3SK1121-2AB40 is a state-of-the-art safety relay from the 3SK1 series, designed to ensure the highest standards of safety in industrial environments. This compact device, measuring 22.5 x 100 x 121.6 mm, is engineered to seamlessly integrate into a variety of control systems, providing reliable protection and monitoring for machinery and personnel.
Equipped with a 24 V dc control supply voltage, the relay is suitable for Class A environments, adept at managing undesired radio-frequency interference in such settings with appropriate measures. It features a single-channel input that can be wired in either a single or dual-channel configuration, enhancing its versatility and application scope.
The safety relay boasts an impressive safety integrity level (SIL) of 3 according to IEC 61508 and a performance level (PL) of e according to EN ISO 13849-1, categorised at level 4. With a safe failure fraction (SFF) of 99%, it ensures a high degree of reliability and safety. The hardware fault tolerance is rated at 1, and the device is classified as a Type B safety device according to IEC 61508-2.
For signalling functions, the relay includes 1 normally closed (NC) contact and 3 normally open (NO) safety-related contacts, ensuring immediate and reliable response to safety conditions. The product is also designed with cross-circuit detection and monitored start-up features, adding an extra layer of safety during operation.
The Siemens 3SK1121-2AB40 is designed for easy installation with its screw and snap-on mounting options, and it supports a wide range of conductor cross-sections for flexible connection requirements. Its push-in terminal connection type simplifies the wiring process, making it user-friendly and time-efficient for setup.
This safety relay is an essential component for applications requiring stringent safety measures, such as emergency stop functions, safety door monitoring, and light curtain integration. Its robust design and advanced safety features make it a reliable choice for safeguarding complex industrial processes.
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Frequently Asked Questions
What type of safety relay is this?
This is a SIRIUS safety relay from the Advanced series, designed for enabling circuits and signalling functions in safety applications.
Can this safety relay be used with both single-channel and two-channel sensor connections?
Yes, the safety relay supports both single-channel and two-channel sensor connections, offering flexibility for various safety circuit configurations.
What is the supply voltage required for this safety relay?
The safety relay requires a supply voltage of 24 V DC to operate effectively.
What are the dimensions of this safety relay?
The dimensions of the safety relay are 22.5 mm in width, 100 mm in height, and 121.6 mm in depth.
What type of terminal connection does this safety relay have?
This safety relay features a spring-type terminal, also known as a push-in terminal, for quick and secure connections.
Is this safety relay suitable for use with safety switches?
Yes, it is suitable for use with safety switches, and it can also monitor floating and non-floating sensors as well as magnetically operated switches.
What is the insulation voltage rating for this safety relay?
The insulation voltage rated value for this safety relay is 300 V.
What is the maximum operating frequency of this safety relay?
The maximum operating frequency of the safety relay is 360 operations per hour.
What is the ambient temperature range for the operation of this safety relay?
The safety relay can operate within an ambient temperature range of -25 °C to +60 °C.
What certifications does this safety relay have?
The safety relay has general product approvals for EMC and conforms to Functional Safety/Safety of Machinery standards.
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