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Siemens 3TK2824-1BB40 SIRIUS Safety Relay - 24V DC, 2 NO

Siemens 3TK2824-1BB40 SIRIUS safety relay with 2 NO autostart contacts.

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ManufacturerSiemens

Part number3TK2824-1BB40

Manufacturer Siemens

Part Number 3TK2824-1BB40

Series SIRIUS

Voltage 24 V DC

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2 NO instantaneous enabling circuits Autostart functionality Compact 22.5 mm width Screw terminal connections 24V DC operating voltage SIL 1 / PL c safety rating

Product description

The Siemens 3TK2824-1BB40 is a SIRIUS safety relay designed for 24V DC operation, featuring a 22.5mm width and screw terminals. This relay provides 2 normally open (NO) instantaneous enabling circuits (EC) and incorporates an autostart function. It is rated for a maximum achieved SIL 1 and PL c, suitable for standard safety monitoring tasks.

This unit is commonly employed in industrial settings for safety functions that require a basic level of risk reduction, such as monitoring safety mats or light curtains on automated machinery. The autostart capability simplifies installation by allowing automatic reset when the safety conditions are met after power-up.

Stanlo Automation, your veteran-owned source for surplus industrial parts, offers the Siemens 3TK2824-1BB40. We pride ourselves on delivering reliable components and excellent service to meet your automation needs.

Technical specifications

Manufacturer	Siemens
Part Number	3TK2824-1BB40
Series	SIRIUS
Voltage	24 V DC
Width	22.5 mm
Terminals	Screw
Enabling Circuits (EC) Instantaneous	2 NO
Enabling Circuits (EC) Delayed	0 NO
Safety Contacts (SC)	0 NC
Autostart	Yes
Maximum SIL	1
Maximum PL	c

Common applications

Basic machine safety

Industrial control panels

Automated manufacturing

Safety monitoring

Machine guarding

Compatible systems

Suitable for industrial automation systems requiring SIL 1 / PL c safety standards.

Also known as

Siemens 3TK2824-1BB40 relay SIRIUS 3TK2824-1BB40 Siemens 24V DC safety relay

Replaces / compatible with

Appropriate for applications demanding SIL 1 / PL c safety performance. Verify system compatibility with Siemens specifications.

Technical note

Expert tip

The autostart function requires careful consideration of the application's reset logic to ensure safe and predictable operation.

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Frequently asked questions

What are the specific safety contacts and features of the Siemens 3TK2824-1BB40?

The Siemens 3TK2824-1BB40 safety relay provides 2 normally open (NO) instantaneous enabling circuits. It features an autostart function and achieves a maximum SIL 1 and PL c safety rating, with no delayed NO or NC safety contacts.