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Siemens 3TK2824-2BB40 SIRIUS Safety Relay - 24V DC, Spring-Type

Siemens 3TK2824-2BB40 SIRIUS safety relay with 2 NO autostart, spring terminals.

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ManufacturerSiemens

Part number3TK2824-2BB40

Manufacturer Siemens

Part Number 3TK2824-2BB40

Series SIRIUS

Voltage 24 V DC

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

Product description

The Siemens 3TK2824-2BB40 is a SIRIUS safety relay designed for 24V DC applications, featuring a narrow 22.5mm width and convenient spring-type terminals. It offers 2 normally open (NO) instantaneous enabling circuits (EC) and includes an autostart feature for simplified operation. This relay meets a maximum achieved SIL 1 and PL c safety rating.

Ideal for panel builders and machine integrators, the spring-type terminals of the 3TK2824-2BB40 facilitate faster and more secure wiring connections, especially in vibration-prone environments. Its autostart function is suited for applications where immediate safety circuit re-enablement upon power restoration is desired.

Stanlo Automation, a veteran-owned distributor of surplus industrial automation parts, carries the Siemens 3TK2824-2BB40. We are committed to providing high-quality components and exceptional service to our customers.

Technical specifications

Manufacturer	Siemens
Part Number	3TK2824-2BB40
Series	SIRIUS
Voltage	24 V DC
Width	22.5 mm
Terminals	Spring-type
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

Machine safety

Industrial control panels

Automated manufacturing

Fast wiring applications

Vibration-resistant installations

Compatible systems

Integrates into control systems requiring SIL 1 / PL c safety performance, with enhanced connection reliability.

Also known as

Siemens 3TK2824-2BB40 relay SIRIUS 3TK2824-2BB40 Siemens 24V DC safety relay

Replaces / compatible with

Designed for applications requiring SIL 1 / PL c safety. The spring-type terminals offer an alternative to screw terminals for faster installation.

Technical note

Expert tip

Spring-type terminals offer excellent vibration resistance, making this relay suitable for mobile machinery or applications subject to shock.

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Frequently asked questions

What are the advantages of the spring-type terminals on the Siemens 3TK2824-2BB40 safety relay?

The spring-type terminals on the Siemens 3TK2824-2BB40 allow for quicker wire termination and provide a more robust connection in environments with significant vibration compared to screw terminals.