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Siemens 3TK2828-1BB40 SIRIUS Safety Relay - 24V DC, Screw Terminal

Siemens 3TK2828-1BB40 SIRIUS safety relay, 24V DC, screw terminal, autostart.

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ManufacturerSiemens

Part number3TK2828-1BB40

Voltage 24 V DC

Width 45 mm

Terminal Type Screw

EC Instantaneous 2 NO

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12-month warranty

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CAGE: 9NK75

24V DC power supply Screw terminal connections Adjustable delay range (0.5-30s) AUTOSTART enabled High safety integrity (SIL 3/2, PL e/d) Compact 45mm design

Product description

The Siemens 3TK2828-1BB40 is a SIRIUS safety relay designed for 24V DC operation. This 45mm wide unit features screw terminals for secure installation and offers 2 instantaneous normally open (NO) enabling circuits and 2 delayed normally open (NO) enabling circuits with an adjustable delay from 0.5 to 30 seconds. It includes 1 normally closed (NC) safety circuit with AUTOSTART functionality for monitored start.

This safety relay is widely applied in industrial settings requiring robust safety monitoring, such as emergency stop circuits, safety gate interlocks, and machine safeguarding systems. Its AUTOSTART feature simplifies operation in applications where automatic reset is desired.

Stanlo Automation, a veteran-owned surplus parts distributor, provides access to essential industrial components like the Siemens 3TK2828-1BB40. We are dedicated to offering reliable and cost-effective solutions to keep your automation systems safe and operational.

Technical specifications

Voltage	24 V DC
Width	45 mm
Terminal Type	Screw
EC Instantaneous	2 NO
EC Delayed	2 NO (0.5-30 s)
SC	1 NC
Autostart	Yes
SIL	3/2
PL	e/d

Common applications

Emergency stop circuits

Safety gate interlocks

Machine safeguarding

Industrial automation

Manufacturing

Control panels

Compatible systems

General industrial control panels

Also known as

Siemens 3TK2828-1BB40

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 that the monitored start circuit is properly wired to prevent unintentional restart after safety events.

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Frequently asked questions

What is the delayed switching time range for the Siemens 3TK2828-1BB40 safety relay?

The Siemens 3TK2828-1BB40 safety relay features a delayed enabling circuit with an adjustable time delay ranging from 0.5 seconds to 30 seconds.