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Siemens 3TK2825-1AJ20 SIRIUS Safety Relay - 115V AC, 45mm, 3 NO, 2 NC

Siemens 3TK2825-1AJ20 SIRIUS safety relay, 3 NO, 2 NC, 115V AC, 45mm.

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ManufacturerSiemens

Part number3TK2825-1AJ20

Manufacturer Siemens

Part Number 3TK2825-1AJ20

Series SIRIUS

Voltage 115 V AC

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3 NO instantaneous enabling circuits 2 NC safety contacts 45mm overall width Screw terminal connections 115V AC operating voltage SIL 3 / PL e safety rating Autostart/Monitored start selectable

Product description

The Siemens 3TK2825-1AJ20 is a high-performance SIRIUS safety relay designed for 115V AC operation. It features a 45mm width with screw terminals and provides 3 normally open (NO) instantaneous enabling circuits along with 2 normally closed (NC) safety contacts. This relay supports both autostart and monitored start modes, offering robust safety functionality with a maximum achieved SIL 3 and PL e rating.

This safety relay is engineered for critical safety applications in various industrial sectors, including manufacturing, automation, and machine building, where high levels of safety integrity are paramount. The flexible start modes and comprehensive contact configuration make it suitable for complex safety interlock systems.

Stanlo Automation, a veteran-owned surplus parts distributor, is pleased to offer the Siemens 3TK2825-1AJ20. We are committed to providing quality industrial automation components and exceptional customer service.

Technical specifications

Manufacturer	Siemens
Part Number	3TK2825-1AJ20
Series	SIRIUS
Voltage	115 V AC
Width	45 mm
Terminals	Screw
Enabling Circuits (EC) Instantaneous	3 NO
Enabling Circuits (EC) Delayed	0 NO
Safety Contacts (SC)	2 NC
Start Mode	Autostart/Monitored Start
Maximum SIL	3
Maximum PL	e

Common applications

Emergency stop circuits

Safety gate monitoring

Light curtain systems

Machine safety

Industrial automation

High-performance safety systems

Compatible systems

Designed for seamless integration into safety control architectures requiring SIL 3 / PL e compliance, supporting both automatic and manual reset configurations.

Also known as

Siemens 3TK2825-1AJ20 relay SIRIUS 3TK2825-1AJ20 Siemens 115V AC safety relay

Replaces / compatible with

Suitable for applications demanding SIL 3 / PL e safety performance. Consult Siemens documentation for specific system compatibility and replacement details.

Technical note

Expert tip

The dual functionality of autostart/monitored start allows this relay to be adapted to a wide range of safety circuits and reset procedures.

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Frequently asked questions

Can the Siemens 3TK2825-1AJ20 safety relay be used with both autostart and monitored start functions?

Yes, the Siemens 3TK2825-1AJ20 safety relay supports both autostart and monitored start modes. This allows for flexible configuration depending on the specific safety requirements of the application, with autostart for automatic resets and monitored start for manual reset initiation.