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Siemens 3TK2827-1AL20 SIRIUS Safety Relay - 230V AC

Siemens 3TK2827-1AL20 SIRIUS safety relay with 2 NO instantaneous, 2 NO delayed, 1 NC SC, 230V AC.

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ManufacturerSiemens

Part number3TK2827-1AL20

Voltage 230V 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 230V AC operation 45mm width Screw terminal

Product description

The Siemens 3TK2827-1AL20 is a SIRIUS safety relay designed for 230V AC operation, featuring a 45mm width and screw terminals. This basic unit provides 2 instantaneous normally open (NO) enabling circuits and 2 NO delayed enabling circuits (0.5-30s), along with 1 NC monitored start contact. It achieves high safety ratings of SIL 3/2 and PL e/d according to IEC 61508 and EN 13849-1 respectively.

This safety relay is suitable for demanding industrial applications where safety is paramount, offering timed responses and monitored start functionality. It is commonly used in machine guarding, emergency stop systems, and process interlocking within manufacturing and automation environments.

Stanlo Automation, your veteran-owned source for surplus industrial automation parts, offers the Siemens 3TK2827-1AL20. We provide quality components and reliable service to ensure your facility's safety systems are up to standard.

Technical specifications

Voltage	230V 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

Industrial Automation

Compatible systems

Compatible with various safety sensors and control systems requiring SIL 3/2 / PL e/d rated safety relays, especially those operating on 230V AC and needing timed or monitored start functions.

Also known as

Siemens 3TK2827-1AL20

Replaces / compatible with

This is a phased-out product. The preferred successor is 3SK1121-1CB42 (24 V !) + 3SK1230-1AW20.

Technical note

Expert tip

The adjustable time delay on the delayed enabling circuits (0.5 to 30 seconds) provides flexibility for applications requiring specific sequential operations after a safety trigger.

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Frequently asked questions

What is the recommended successor for the Siemens 3TK2827-1AL20?

The preferred successor for the Siemens 3TK2827-1AL20, particularly for 24V operation, is a combination of the 3SK1121-1CB42 and 3SK1230-1AW20 safety relays.