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Siemens 3TK2827-1AJ20 SIRIUS Safety Relay - 115V AC

Siemens 3TK2827-1AJ20 SIRIUS safety relay with 2 NO instantaneous, 2 NO delayed, and 1 NC monitored start.

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ManufacturerSiemens

Part number3TK2827-1AJ20

Voltage 115V AC

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 115V AC operation 45mm width Screw terminal

Product description

The Siemens 3TK2827-1AJ20 is a SIRIUS safety relay designed for 115V AC operation, featuring a 45mm width and screw terminals. This basic device is equipped with 2 instantaneous normally open (NO) enabling circuits and 2 NO delayed enabling circuits (0.5-30s), along with 1 normally closed (NC) monitored start contact. It achieves a high safety integrity level, with a maximum SIL of 3/2 and PL of e/d.

This safety relay is suitable for applications requiring both immediate safety response and timed functions, such as machine guarding, emergency stops with timed restarts, and process interlocking. The monitored start function adds an extra layer of safety to the operational sequence.

Source your Siemens 3TK2827-1AJ20 from Stanlo Automation, a veteran-owned provider of surplus industrial automation parts. We offer quality components and reliable service to ensure your safety systems are robust.

Technical specifications

Voltage	115V AC
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 Circuits

Industrial Control

Compatible systems

Compatible with various safety sensors and control systems requiring SIL 3/2 / PL e/d rated safety relays, particularly those needing timed functions and monitored start capabilities.

Also known as

Siemens 3TK2827-1AJ20

Replaces / compatible with

The preferred successor for some applications might be the 3SK1 series, depending on specific requirements.

Technical note

Expert tip

The delayed enabling circuits offer adjustable timing from 0.5 to 30 seconds, allowing for integration into processes that require a specific delay before resuming operation after a safety event.

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Frequently asked questions

What is the function of the monitored start contact on the Siemens 3TK2827-1AJ20?

The 1 NC monitored start contact on the Siemens 3TK2827-1AJ20 ensures that the machine can only be restarted after a safety condition is met and the start button is pressed and released correctly, adding a layer of safety to the restart sequence.