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Siemens 3TK2828-1AJ21 SIRIUS Safety Relay - 115V AC, Screw Terminal

Siemens 3TK2828-1AJ21 SIRIUS safety relay, 115V AC, screw terminal, short delay.

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ManufacturerSiemens

Part number3TK2828-1AJ21

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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Veteran-owned

CAGE: 9NK75

115V AC input Screw terminals for secure wiring Short delay adjustment (0.05-3s) AUTOSTART capability High safety ratings (SIL 3/2, PL e/d) 45mm compact design

Product description

The Siemens 3TK2828-1AJ21 is a SIRIUS safety relay designed for 115V AC power systems. This 45mm wide unit features reliable screw terminals for installation. It provides 2 instantaneous normally open (NO) enabling circuits and 2 delayed normally open (NO) enabling circuits with a precisely adjustable delay ranging from 0.05 to 3 seconds. Additionally, it includes 1 normally closed (NC) safety circuit with AUTOSTART functionality for monitored start operations.

This safety relay is suitable for applications requiring fast safety response times and automated restarts, commonly found in machine guarding, assembly automation, and material handling systems. It is particularly useful in environments where rapid cycle times are important.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 3TK2828-1AJ21. We are committed to providing quality industrial automation components that help maintain the highest safety standards for your operations.

Technical specifications

Voltage	115 V AC
Width	45 mm
Terminal Type	Screw
EC Instantaneous	2 NO
EC Delayed	2 NO (0.05-3 s)
SC	1 NC
Autostart	Yes
SIL	3/2
PL	e/d

Common applications

Machine guarding

Assembly automation

Material handling

Industrial safety

Manufacturing automation

Control panels

Compatible systems

General industrial control panels

Also known as

Siemens 3TK2828-1AJ21

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

When using the AUTOSTART function, ensure that all potential hazards are cleared before the safety circuit is re-enabled to prevent unexpected machine movement.

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Frequently asked questions

What is the purpose of the AUTOSTART feature on the Siemens 3TK2828-1AJ21?

The AUTOSTART feature on the Siemens 3TK2828-1AJ21 allows the safety relay to automatically reset and resume operation once the safety conditions are met, without the need for an external reset signal. This is useful for applications where manual reset is not practical or desired.