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Siemens 3TK2828-1BB41 SIRIUS Safety Relay - 24V DC, Screw Terminal

Siemens 3TK2828-1BB41 SIRIUS safety relay, 24V DC, screw terminal, short delay.

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ManufacturerSiemens

Part number3TK2828-1BB41

Voltage 24 V DC

Width 45 mm

Terminal Type Screw

EC Instantaneous 2 NO

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24V DC operation Screw terminal connection Short adjustable delay (0.05-3s) AUTOSTART functionality High safety integrity (SIL 3/2, PL e/d) 45mm compact size

Product description

The Siemens 3TK2828-1BB41 is a SIRIUS safety relay designed for 24V DC applications. This 45mm wide unit features robust screw terminals for installation. It offers 2 instantaneous normally open (NO) enabling circuits and 2 delayed normally open (NO) enabling circuits with a short, adjustable delay from 0.05 to 3 seconds. Additionally, it includes 1 normally closed (NC) safety circuit with AUTOSTART functionality for monitored start operations.

This safety relay is ideal for applications requiring rapid safety response and automated resetting, such as in machine safeguarding, control panel safety, and automated manufacturing processes. The short delay is beneficial for applications needing quick recovery after safety conditions are met.

As a veteran-owned surplus parts distributor, Stanlo Automation provides reliable access to essential industrial components like the Siemens 3TK2828-1BB41. We are committed to offering quality surplus parts to ensure your automation systems meet stringent safety requirements and operational efficiency.

Technical specifications

Voltage	24 V DC
Width	45 mm
Terminal Type	Screw
EC Instantaneous	2 NO
EC Delayed	2 NO (0.05-3 s)
SC	1 NC
Autostart	Yes
SIL	3/2
PL	e/d

Common applications

Machine safeguarding

Control panel safety

Automated manufacturing

Industrial safety

Emergency stop circuits

Safety interlocks

Compatible systems

General industrial control panels

Also known as

Siemens 3TK2828-1BB41

Replaces / compatible with

This is a specific model and does not have a direct replacement listed as standard. Consult Siemens documentation for upgrade paths.

Technical note

Expert tip

Ensure proper wiring of the safety contactor or monitored start input to guarantee the intended safety function and fault detection capabilities.

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Frequently asked questions

What is the function of the SC (Safety Circuit) in the Siemens 3TK2828-1BB41 safety relay?

The SC (Safety Circuit) in the Siemens 3TK2828-1BB41 safety relay typically refers to a normally closed (NC) output used for monitoring the status of external safety devices or for implementing a manual reset function. In this specific model, it is configured as 1 NC with AUTOSTART.