Description: 3TK2825-1BB40
The Siemens 3TK2825-1BB40 is a classic **SIRIUS Safety Relay** designed for monitoring safety-critical circuits such as Emergency Stops (E-Stop) and protective doors/gates. Operating on 24 V DC, it ensures the safe shutdown of machinery in hazardous situations.
Specifications
- Supply Voltage: 24 V DC.
- Safety Contacts: 3 NO (Normally Open) – Instantaneous.
- Auxiliary Contacts: 2 NC (Normally Closed).
- Category: Up to Cat. 4 / PL e according to EN ISO 13849-1.
Legacy Replacement
While Siemens has introduced the newer 3SK1 series, the **3TK2825-1BB40** remains installed in countless control panels globally. Replacing it with the exact part number avoids the need to redesign the safety circuit wiring diagrams. It features cross-circuit detection and monitored start capabilities.
