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Siemens 3TK2825-1BB40 SIRIUS Safety Relay

Siemens 3TK2825-1BB40 SIRIUS safety relay, 24V DC, SIL 3, PL E.

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ManufacturerSiemens

Part number3TK2825-1BB40

Type SIRIUS Safety Relay

Voltage 24 V DC

Width 45 mm

Terminals Screw

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Veteran-owned

CAGE: 9NK75

High safety ratings (SIL 3, PL E) Compact 45mm width 24V DC operation 3 instantaneous enabling circuits 2 NC safety outputs Monitored start capability

Product description

The Siemens 3TK2825-1BB40 is a SIRIUS safety relay with relay enabling circuits (EC). It operates on 24V DC and has a narrow 45mm overall width with screw terminals. The basic device offers 3 instantaneous NO enabling circuits and 2 NC safety outputs, supporting both autostart and monitored start configurations.

This safety relay is designed to monitor safety functions in machinery and industrial applications, contributing to higher safety integrity levels (SIL 3) and performance levels (PL E). It is crucial for applications where personnel safety is paramount, such as emergency stop circuits and safety gate monitoring.

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Technical specifications

Type	SIRIUS Safety Relay
Voltage	24 V DC
Width	45 mm
Terminals	Screw
Enabling Circuits (EC)	3 NO instantaneous
Safety Outputs (SC)	2 NC
Start Mode	Autostart/Monitored start
SIL	3
PL	E

Common applications

Machine safety

Emergency stop circuits

Safety gate monitoring

Industrial control panels

Automation safety systems

Compatible systems

Siemens SIRIUS safety components Emergency stop buttons Safety gates and light curtains Industrial automation control systems

Also known as

Siemens SIRIUS Safety Relay 3TK2825-1BB40 24V DC Safety Relay 3TK28251BB40

Replaces / compatible with

This safety relay is part of the Siemens SIRIUS 3TK28 range, designed for comprehensive machine safety solutions.

Technical note

Expert tip

For monitored start, ensure the correct wiring of the start/stop buttons and any reset devices to the appropriate terminals.

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Frequently asked questions

What are the key safety ratings for the Siemens 3TK2825-1BB40 safety relay?

The Siemens 3TK2825-1BB40 safety relay achieves a Safety Integrity Level (SIL) of 3 and a Performance Level (PL) of E. These high ratings ensure robust protection for critical safety functions in industrial machinery.