Siemens – 3TK2828-2BB41 – SIRIUS Safety Relay with Enabling Circuits (24 V DC)

Main Features

• Manufacturer: Siemens (SIRIUS series)  

• Model/MPN: 3TK2828‑2BB41

• Device Type: Safety relay with built-in enabling circuits (EC) for use in emergency-stop and safety-door applications  

• Supply Voltage: 24 V DC  

• Enabling Circuit Contacts: 2 × NO instantaneous + 2 × NO delayed (0.05–3 s)  

• Signaling Contact: 1 × NC feedback contact (SC)  

• Time Delay Range: Adjustable from 0.05 to 3 seconds  

• Safety Integrity: Achieves SIL 3 (instantaneous) / SIL 2 (delayed) and Performance Level e/d  

• Mounting & Dimensions: Compact 45 mm-wide DIN-rail module with spring‑type terminals  

• Protection & Certifications: Finger-safe terminals, IP20, insulation rated 300 V, meets IEC 61508 / ISO 13849‑1 standards