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Siemens 3TK2841-1BB40 SIRIUS Safety Relay - 24V DC

Siemens 3TK2841-1BB40 SIRIUS Safety Relay

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ManufacturerSiemens

Part number3TK2841-1BB40

Voltage 24V DC

Width 22.5 mm

Terminals Screw

EC Instantaneous 2 HL

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Veteran-owned

CAGE: 9NK75

Electronic enabling circuits (EC) 24V DC operation Autostart and monitored start SIL 3, PL e rating Compact 22.5mm width Standard device

Product description

The Siemens 3TK2841-1BB40 is a SIRIUS safety relay with electronic enabling circuits (EC) designed for standard safety applications. It operates on 24V DC and features a compact 22.5mm width with screw terminals. This standard device offers 2 electronic "HL" safety outputs and no delayed outputs, supporting both autostart and monitored start functionalities.

This safety relay achieves a higher safety rating of Safety Integrity Level (SIL) 3 and Performance Level (PL) e, making it suitable for more critical emergency stop and safety door applications.

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Technical specifications

Voltage	24V DC
Width	22.5 mm
Terminals	Screw
EC Instantaneous	2 HL
EC Delayed	0
Autostart	Yes
Monitored Start	Yes
SIL	3
PL	e
Type	Standard Device

Common applications

Machine safety

Emergency stop circuits

Protective door monitoring

High-risk industrial applications

Control systems

Compatible systems

Designed for use with advanced safety systems and sensors requiring SIL 3 / PL e.

Also known as

Siemens SIRIUS Standard Safety Relay 24V DC Electronic Safety Relay

Replaces / compatible with

This product is phased out/discontinued. The preferred successor is the 3SK1112-1BB40. Contact Siemens for specific replacement guidance.

Technical note

Expert tip

The SIL 3 / PL e rating makes this unit suitable for applications with the highest safety demands.

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Frequently asked questions

What is the difference between the 3TK2840-1BB40 and 3TK2841-1BB40 safety relays?

The primary difference is the safety rating: the 3TK2840-1BB40 achieves SIL 2/PL d, while the 3TK2841-1BB40 offers a higher SIL 3/PL e rating for more critical applications.