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Siemens 3TK2827-1BB40 SIRIUS Safety Relay - 24V DC

Siemens 3TK2827-1BB40 SIRIUS safety relay with 2 NO instantaneous, 2 NO delayed, 1 NC SC, 24V DC.

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ManufacturerSiemens

Part number3TK2827-1BB40

Voltage 24V DC

Width 45 mm

Terminals Screw

Enabling Circuits (EC) Instantaneous 2 NO

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2 instantaneous NO enabling circuits 2 delayed NO enabling circuits (0.5-30s) 1 NC monitored start contact 24V DC operation 45mm width Screw terminal

Product description

The Siemens 3TK2827-1BB40 is a SIRIUS safety relay designed for 24V DC operation, featuring a 45mm width with screw terminals. This basic device includes 2 instantaneous normally open (NO) enabling circuits and 2 NO delayed enabling circuits (0.5-30s), along with a 1 NC monitored start contact. It is built to high safety standards, achieving a maximum SIL of 3/2 and PL of e/d.

This safety relay is ideal for diverse industrial automation applications requiring reliable safety functions with timed responses and monitored start capabilities. Its 24V DC operation makes it suitable for a wide range of control systems.

Stanlo Automation, a veteran-owned distributor of surplus industrial automation parts, offers the Siemens 3TK2827-1BB40. We provide quality components and efficient service to ensure your safety infrastructure is robust and dependable.

Technical specifications

Voltage	24V DC
Width	45 mm
Terminals	Screw
Enabling Circuits (EC) Instantaneous	2 NO
Enabling Circuits (EC) Delayed	2 NO (0.5-30 s)
Safety Contacts (SC)	1 NC monitored start
Max SIL	3/2
Max PL	e/d

Common applications

Machine Safety

Emergency Stop

Safety Interlocking

Timed Safety Functions

Monitored Start

Industrial Control

Compatible systems

Compatible with various safety sensors and control systems requiring SIL 3/2 / PL e/d rated safety relays, especially those operating on 24V DC and needing timed or monitored start functions.

Also known as

Siemens 3TK2827-1BB40

Replaces / compatible with

This model is part of the SIRIUS safety relay range and integrates well with other Siemens industrial control components.

Technical note

Expert tip

The integrated adjustable timer for the delayed enabling circuits (0.5-30 seconds) simplifies system design by eliminating the need for an external timer for certain safety sequences.

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Frequently asked questions

How is the monitored start function used with the Siemens 3TK2827-1BB40?

The monitored start function (1 NC contact) on the Siemens 3TK2827-1BB40 requires a specific sequence for restarting machinery, typically involving a reset button press after safety conditions are met, preventing accidental machine startup.