SIEMENS 3TK2825-1BB40

Siemens SIRIUS 3TK2825-1BB40 Safety Relay

Description

The Siemens 3TK2825-1BB40 is a safety relay from the proven SIRIUS series, designed for monitoring safety functions in industrial applications. It operates on a 24V DC supply and is suitable for applications requiring high safety standards, such as emergency stop circuits and protective door monitoring. This unit provides a dependable solution for ensuring machine and operator safety.

Specifications

• Manufacturer: Siemens
• Series: SIRIUS
• Model: 3TK2825-1BB40
• Supply Voltage: 24V DC
• Power Consumption: 3W
• Outputs: 2 NO (Normally Open) instantaneous enabling circuits
• Contact Rating (AC-15): 6A at 230V
• Contact Rating (DC-13): 6A at 24V
• Terminals: Screw-type
• Mounting: 35mm DIN Rail
• Safety Level: SIL 3 (IEC 61508), PL e (EN ISO 13849-1)

Label Info

• Part Number: 3TK2825-1BB40
• EAN: 4011209380691

Application

This safety relay is ideal for implementing safety functions in a wide range of machinery, including manufacturing lines, packaging machines, and robotic cells. It is typically used to monitor E-STOP buttons, safety gates, light curtains, and two-hand controls.

Country of Origin

Made in Germany.

CO2 Impact

By purchasing this reused Siemens safety relay, you are helping to avoid approximately 12 kg of CO2 emissions compared to buying a new one. This saving is a significant contribution to sustainable industrial practices.

Availability

This is an obsolete item but available from our stock as a reliable spare part for existing systems. Order now from spareparts2day for expert support and fast delivery.

FAQ

What is the difference between an instantaneous and a delayed enabling circuit?

An instantaneous enabling circuit switches immediately when the safety conditions are met. A delayed circuit, which this specific model does not have, waits for a preset time before switching. This model, 3TK2825-1BB40, features two instantaneous NO circuits.

Can this 3TK2825-1BB40 relay be used for monitoring a light curtain?

Yes, this safety relay is suitable for monitoring OSSD (Output Signal Switching Device) outputs from safety devices like light curtains, provided the light curtain’s specifications are compatible with the relay’s input requirements.

This model is obsolete. What considerations are needed when migrating to a modern 3SK1 series relay?

When migrating to a successor like the 3SK1 series, you must check the wiring diagram, terminal layout, physical dimensions, and safety function certifications. The 3SK1 relays are more compact and may offer enhanced diagnostic features, but a direct 1-to-1 terminal replacement is not always possible, so the circuit design should be reviewed.

Last Update: Friday, March 13, 2026

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