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Siemens 3TK2825-2BB40 SIRIUS Safety Relay - 24V DC, Spring, 3 NO, 2 NC

Siemens 3TK2825-2BB40 SIRIUS safety relay, 3 NO, 2 NC, 24V DC, spring terminals.

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ManufacturerSiemens

Part number3TK2825-2BB40

Manufacturer Siemens

Part Number 3TK2825-2BB40

Series SIRIUS

Voltage 24 V DC

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3 NO instantaneous enabling circuits 2 NC safety contacts Spring-type terminal connections 45mm overall width 24V DC operating voltage SIL 3 / PL e safety rating Autostart/Monitored start selectable

Product description

The Siemens 3TK2825-2BB40 is a SIRIUS safety relay designed for 24V DC applications, featuring a 45mm width and convenient spring-type terminals. This unit provides 3 normally open (NO) instantaneous enabling circuits and 2 normally closed (NC) safety contacts. It supports both autostart and monitored start functions, delivering a high level of safety with a maximum achieved SIL 3 and PL e rating.

Ideal for applications requiring robust and fast connections, the spring-type terminals on this relay ensure secure wiring even in high-vibration environments. Its versatility in start modes makes it suitable for a wide array of safety functions in industrial machinery and automation.

Stanlo Automation, your veteran-owned source for surplus industrial parts, offers the Siemens 3TK2825-2BB40. We are dedicated to providing quality components and reliable service to meet your automation needs.

Technical specifications

Manufacturer	Siemens
Part Number	3TK2825-2BB40
Series	SIRIUS
Voltage	24 V DC
Width	45 mm
Terminals	Spring-type
Enabling Circuits (EC) Instantaneous	3 NO
Enabling Circuits (EC) Delayed	0 NO
Safety Contacts (SC)	2 NC
Start Mode	Autostart/Monitored Start
Maximum SIL	3
Maximum PL	e

Common applications

Emergency stop circuits

Safety gate monitoring

Light curtain systems

Machine safety

Industrial automation

High-vibration environments

Compatible systems

Designed for integration into high-integrity safety systems (SIL 3 / PL e) where reliable and fast connections are essential, including in dynamic environments.

Also known as

Siemens 3TK2825-2BB40 relay SIRIUS 3TK2825-2BB40 Siemens 24V DC spring terminal relay

Replaces / compatible with

Suitable for applications demanding SIL 3 / PL e safety and requiring secure, fast connections. The spring terminals offer an advantage in high-vibration settings.

Technical note

Expert tip

The combination of high safety ratings (SIL 3 / PL e) and vibration-resistant spring terminals makes this relay ideal for mobile machinery and robust industrial applications.

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Frequently asked questions

What are the benefits of the spring-type terminals on the Siemens 3TK2825-2BB40 safety relay?

The spring-type terminals on the Siemens 3TK2825-2BB40 provide quick and secure wire connections that are highly resistant to vibration. This makes it an excellent choice for installations in demanding industrial environments where terminal connections must remain stable.