Home › Manufacturers › Siemens › 3TK2821-2CB30

Siemens

Siemens 3TK2821-2CB30 SIRIUS Safety Relay - Spring Terminals

Siemens SIRIUS safety relay with spring terminals, expandable.

● In Stock 12-Mo Warranty Same-Day Dispatch Ships Worldwide 🎖 Veteran-Owned

In Stock — Ready to Ship

ManufacturerSiemens

Part number3TK2821-2CB30

Voltage 24 V AC/DC

Width 22.5 mm

Terminals Spring-type

EC Instantaneous 3 NO

Get a price for 3TK2821-2CB30

Response within 1 business hour

🛡

12-month warranty

All units tested

⚡

Same-day dispatch

Order by 2pm CST

🌐

Worldwide delivery

US, EU, Asia, Middle East

🎖

Veteran-owned

CAGE: 9NK75

24V AC/DC operation Spring-type terminals 3 NO EC contacts 1 NC SC contact Autostart/Manual start Expandable to PL e / SIL 3

Product description

The Siemens 3TK2821-2CB30 is a SIRIUS safety relay featuring relay enabling circuits (EC) and spring-type terminals, designed for expansion in safety systems. It operates on 24 V AC/DC and has a 22.5 mm width. This unit provides 3 instantaneous normally open (NO) EC contacts and 1 normally closed (NC) safety contact (SC). As a basic device, it offers PL 'c' and SIL 1, but when used to expand a compatible base safety relay, it supports achieving up to PL 'e' and SIL 3.

This safety relay is beneficial for modular safety control solutions, commonly found in automotive production, material handling, and packaging machinery. The spring-type terminals ensure quick and secure connections, ideal for environments where vibration is a concern or rapid installation is required.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 3TK2821-2CB30. We provide access to quality surplus components to help you maintain operational efficiency and safety compliance for your industrial automation systems.

Technical specifications

Voltage	24 V AC/DC
Width	22.5 mm
Terminals	Spring-type
EC Instantaneous	3 NO
EC Delayed	0
SC	1 NC
Autostart/Manual start	Yes
Basic Device SIL	1
Basic Device PL	c
Expansion SIL	3
Expansion PL	e

Common applications

Machine Safety

Industrial Automation

Safety System Expansion

Fast Installation

Manufacturing Automation

Packaging Machines

Compatible systems

Compatible with Siemens SIRIUS safety relay systems

Also known as

Siemens SIRIUS safety relay spring terminal 3TK2821-2CB30 safety module

Replaces / compatible with

Designed as an expansion unit to enhance safety functionality when used with compatible Siemens base safety relays.

Technical note

Expert tip

Verify compatibility with the main safety relay and ensure proper jumper configuration when integrating this unit into a safety circuit.

What happens next?

Email confirmation

Immediate receipt acknowledgment sent to you

Account manager assigned

Confirms your part's spec and condition

Your quote delivered

Tailored to your specific requirements

Frequently asked questions

What is the advantage of spring-type terminals on the Siemens 3TK2821-2CB30 safety relay for expansion?

The spring-type terminals on the Siemens 3TK2821-2CB30 enable faster and more secure wiring compared to screw terminals, which is beneficial for quick setup and reliable connections, especially when expanding complex safety circuits.