Siemens 3TK2825-1BB40 Safety Relay 3TK28251BB40

Description:

The Siemens 3TK2825-1BB40 safety relay is used in industrial machine safety and protection systems. Commonly installed in emergency stop circuits, safety interlocks, and machine guarding applications. Maintenance teams, OEMs, and system integrators use this part for replacement, retrofit, and safety circuit implementation.

Applications:

The Siemens 3TK2825-1BB40 is used in industrial automation systems to monitor and control safety circuits for machinery and equipment. It is widely deployed in production lines, robotic systems, and manufacturing equipment where emergency stop, guard door monitoring, and operator safety are critical. The safety relay ensures reliable shutdown and compliance with industrial safety standards in hazardous environments.

Technical Specifications:

• Manufacturer: Siemens
• Model / Part Number: 3TK2825-1BB40
• Product Type: Safety Relay
• Supply Voltage: 24 V DC
• Contact Configuration: 3 NO (normally open) safety contacts + 1 NC auxiliary contact
• Switching Capacity: Up to 5 A per contact
• Safety Category: Suitable for Category 3 / PL d applications
• Response Time: Fast switching response (<30 ms typical)
• Reset Type: Manual / automatic reset selectable
• Monitoring Function: Emergency stop and safety circuit monitoring
• Mounting: DIN rail
• Protection Rating: IP20
• Operating Temperature: -25°C to +55°C
• Terminal Type: Screw terminals
• Standards Compliance: EN ISO 13849-1, IEC 62061

Common Replacements:

• Siemens 3SK1111-1AB30
• Siemens 3TK2827-1BB40
• Siemens 3SK1121-1AB30