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Siemens 3TK2825-1AL20 SIRIUS Safety Relay - 230V AC, 45mm, 3 NO, 2 NC

Siemens 3TK2825-1AL20 SIRIUS safety relay, 3 NO, 2 NC, 230V AC, 45mm.

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ManufacturerSiemens

Part number3TK2825-1AL20

Manufacturer Siemens

Part Number 3TK2825-1AL20

Series SIRIUS

Voltage 230 V AC

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3 NO instantaneous enabling circuits 2 NC safety contacts 45mm overall width Screw terminal connections 230V AC operating voltage SIL 3 / PL e safety rating Autostart/Monitored start selectable

Product description

The Siemens 3TK2825-1AL20 is a SIRIUS safety relay designed for 230V AC operation, featuring a 45mm width and screw terminals. This relay is equipped with 3 normally open (NO) instantaneous enabling circuits and 2 normally closed (NC) safety contacts. It offers flexible operation with both autostart and monitored start capabilities, achieving a high safety rating of SIL 3 and PL e.

This safety relay is ideal for high-integrity safety applications in industrial automation, machine control, and manufacturing environments where reliable monitoring of safety devices is critical. The combination of versatile start modes and robust contact configuration makes it suitable for complex safety circuits.

Stanlo Automation, a veteran-owned distributor of surplus industrial parts, provides the Siemens 3TK2825-1AL20. We are committed to offering quality components and dependable service to keep your operations running efficiently.

Technical specifications

Manufacturer	Siemens
Part Number	3TK2825-1AL20
Series	SIRIUS
Voltage	230 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-risk machinery

Compatible systems

Integrates effectively into safety control systems requiring SIL 3 / PL e ratings, offering versatile start mode options for optimal safety implementation.

Also known as

Siemens 3TK2825-1AL20 relay SIRIUS 3TK2825-1AL20 Siemens 230V AC safety relay

Replaces / compatible with

Suitable for applications requiring SIL 3 / PL e safety performance. Verify system compatibility with Siemens documentation for precise replacement guidance.

Technical note

Expert tip

The 230V AC operating voltage makes this relay suitable for standard industrial power distribution systems, while its high safety ratings ensure critical protection.

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Frequently asked questions

How does the autostart/monitored start functionality on the Siemens 3TK2825-1AL20 affect safety resets?

The Siemens 3TK2825-1AL20 can be configured for autostart, which automatically re-enables the safety circuit when conditions are met, or monitored start, which requires an external reset button. This flexibility allows for adaptation to different safety protocols and risk assessments.