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Siemens 3TK2840-1BB40 SIRIUS Safety Relay - 24V DC

Siemens 3TK2840-1BB40 SIRIUS Safety Relay

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ManufacturerSiemens

Part number3TK2840-1BB40

Voltage 24V DC

Width 22.5 mm

Terminals Screw

EC Instantaneous 2 HL

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Electronic enabling circuits (EC) 24V DC operation Autostart and monitored start SIL 2, PL d rating Compact 22.5mm width Base unit

Product description

The Siemens 3TK2840-1BB40 is a SIRIUS safety relay featuring electronic enabling circuits (EC) for advanced safety monitoring. It operates on a 24V DC supply and has a compact 22.5mm width with screw terminals. This base unit provides 2 electronic "HL" (likely High Level or similar) safety outputs and no delayed outputs. It supports autostart and monitored start functions.

This safety relay is designed to achieve a Safety Integrity Level (SIL) of 2 and a Performance Level (PL) of d. It is suitable for emergency stop and protective door applications within industrial automation environments.

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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	2
PL	d
Type	Basic Device

Common applications

Machine safety

Emergency stop circuits

Protective door monitoring

Industrial control

Automation systems

Compatible systems

Integrates with safety sensors and control systems requiring SIL 2 / PL d compliance.

Also known as

Siemens SIRIUS Electronic Safety Relay 24V DC Safety Relay

Replaces / compatible with

This product is phased out. The preferred successor is the 3SK1112-1BB40. Contact Siemens for direct replacement information.

Technical note

Expert tip

The "HL" designation for outputs likely refers to specific electronic safety signal types; consult the datasheet for precise interpretation.

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Frequently asked questions

What are the safety integrity and performance levels for the Siemens 3TK2840-1BB40 safety relay?

The Siemens 3TK2840-1BB40 safety relay is designed to achieve a Safety Integrity Level (SIL) of 2 and a Performance Level (PL) of d, suitable for many industrial safety applications.