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Siemens 3TK2828-1AJ20 SIRIUS Safety Relay - 115V AC, Screw Terminal

Siemens 3TK2828-1AJ20 SIRIUS safety relay, 115V AC, screw terminal.

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ManufacturerSiemens

Part number3TK2828-1AJ20

Voltage 115 V AC

Width 45 mm

Terminal Type Screw

EC Instantaneous 2 NO

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12-month warranty

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CAGE: 9NK75

115V AC operation Screw terminal connections Adjustable delay (0.5-30s) AUTOSTART function High safety integrity levels (SIL 3/2, PL e/d) 45mm modular width

Product description

The Siemens 3TK2828-1AJ20 is a SIRIUS safety relay designed for AC voltage applications, operating at 115V AC. This 45mm wide unit features screw terminals for secure connections and includes 2 instantaneous normally open (NO) enabling circuits and 2 delayed normally open (NO) enabling circuits with an adjustable delay from 0.5 to 30 seconds. It also incorporates 1 normally closed (NC) safety circuit with AUTOSTART functionality for monitored start.

This safety relay is suitable for a broad spectrum of industrial safety applications, including machine tools, assembly lines, and material handling equipment where AC power is prevalent. Its features are vital for ensuring compliance with safety standards in manufacturing and processing plants.

Stanlo Automation, a veteran-owned distributor of industrial automation surplus, offers the Siemens 3TK2828-1AJ20. We provide a reliable source for high-quality safety components, ensuring your facility maintains optimal safety standards while benefiting from cost-effective solutions.

Technical specifications

Voltage	115 V AC
Width	45 mm
Terminal Type	Screw
EC Instantaneous	2 NO
EC Delayed	2 NO (0.5-30 s)
SC	1 NC
Autostart	Yes
SIL	3/2
PL	e/d

Common applications

Machine tools

Assembly lines

Material handling

Industrial automation

Manufacturing plants

Safety control systems

Compatible systems

General industrial control panels

Also known as

Siemens 3TK2828-1AJ20

Replaces / compatible with

This is a specific model and does not have a direct replacement listed as standard. Consult Siemens documentation for upgrade paths.

Technical note

Expert tip

The AUTOSTART feature should only be used in applications where the risk of unexpected machine restart is acceptable or mitigated by other safety measures.

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Frequently asked questions

Does the Siemens 3TK2828-1AJ20 safety relay support automatic start-up?

Yes, the Siemens 3TK2828-1AJ20 safety relay is equipped with an AUTOSTART function. This means that after a safety function is restored, the device will automatically restart without requiring a separate start command, simplifying operation in certain applications.