Siemens 3TK2821-1CB30

Siemens 3TK2821-1CB30 – SIRIUS Safety Relay for Reliable Machine Protection

The Siemens 3TK2821-1CB30 is a high-performance safety relay from the trusted SIRIUS line, engineered to meet rigorous safety requirements in modern industrial environments. Designed for emergency stop circuits and safety interlock systems, this compact safety relay offers dependable functionality to safeguard machinery and personnel. Operating at 24 VAC/DC, it provides three normally open (N/O) safety outputs and one normally closed (N/C) signaling output, making it ideal for integration into a wide range of automation and control applications. With its 22.5 mm width, screw terminals, and robust construction, the unit is a perfect fit for control panels where safety, space efficiency, and reliability are priorities.

Versatile Safety Control with Flexible Start Functions

The 3TK2821-1CB30 supports automatic and manual start functions, allowing it to be tailored to specific safety requirements of the machine or process. In automatic start mode, the relay resumes operation immediately after the safety circuit is closed, which is suitable for automated systems requiring quick recovery. In manual start mode, an operator must actively confirm the safety condition before restarting, adding a layer of control and safety. This flexibility makes the unit suitable for various machine applications, from simple e-stop configurations to more complex systems with safety gates or multiple interlocks.

Compact Design and Finger-Safe Terminals for Easy Installation

The relay's compact 22.5 mm width enables easy installation in crowded control cabinets without sacrificing functionality. It includes finger-safe screw terminals that simplify wiring while maintaining high safety standards, helping to prevent accidental contact during installation or maintenance. The modular design aligns with Siemens' SIRIUS safety components, allowing seamless integration with other SIRIUS modules in a standard panel layout. With its standardized terminal arrangement and marked connections, setup is straightforward for technicians familiar with Siemens automation products.

Certified Safety and Reliable Performance

Built to meet international safety standards, the 3TK2821-1CB30 ensures dependable performance in critical applications. It is especially suited for use in machinery safety circuits where fail-safe operation is crucial. The relay-enabling circuits ensure that the outputs remain deactivated until the monitored circuit is confirmed safe, reducing the risk of accidental startup. Its mechanical durability and electrical lifespan make it a long-term solution for continuous industrial use, minimizing the need for maintenance or replacement.

In-Stock Availability and Trusted Warranty from MRO Electric

The Siemens 3TK2821-1CB30 is available immediately from MRO Electric and Supply, making it a practical solution for new installations and urgent replacement needs. MRO includes a 2-year warranty on this safety relay, offering peace of mind and demonstrating confidence in the product's reliability. Additionally, free shipping ensures quick delivery, allowing customers to keep projects on schedule and systems protected without delay.

FAQs – Siemens 3TK2821-1CB30 Safety Relay

What voltage does the relay operate on?

It operates on both 24 VAC and 24 VDC.

How many safety outputs are included?

The relay includes three normally open (N/O) safety outputs.

What is the function of the typically closed (N/C) output?

The N/C output is used for signaling or monitoring purposes.

Can this relay be used in emergency stop applications?

Yes, it is specifically designed for emergency stop and safety interlock applications.

What is the width of the unit?

It has a slim 22.5 mm width, ideal for control cabinet installations.

Does it support manual and automatic start modes?

Yes, it can be configured for either manual or automatic start operation.

Are the terminals finger-safe?

Yes, it features finger-safe screw terminals for added safety during wiring.

Is it compatible with other SIRIUS modules?

Yes, it integrates easily with other SIRIUS safety and control components.

What kind of applications is it suited for?

It is ideal for machinery requiring reliable safety relays in e-stop and gate monitoring systems.

Is it available with a warranty and shipping?

Yes, it comes with a 2-year MRO Electric warranty and free shipping.

Contact Us Today For More Information About Siemens Products

Check out the rest of our Siemens product line. Whether it's using our online instant quote feature, giving us a call at (800) 691-8511, or emailing us at sales@mroelectric.com, we strive for customer satisfaction first. This means lower prices and better service for you. For more products like 3TK2821-1CB30, take a look at more from our Breakers line. If your current unit has gone bad, take advantage of our Core Exchange program for the most inexpensive route. You can learn more about this program on our FAQ page here. We offer a repair service on all of our 3TK2821-1CB30 products that keep your downtime to a minimum. To stay up to date on manufacturer news, as well as access any of our datasheets, manuals, or other documentation, we suggest you take a look at our blog.