SIEMENS 3TX7002-1BB00

Siemens SIRIUS 3TX7002-1BB00 Coupling Relay

Description

The Siemens 3TX7002-1BB00 is a versatile coupling relay from the SIRIUS series, designed as an interface converter for industrial control systems. It provides reliable electrical isolation and signal amplification between a controller’s output and the field actuator or sensor. This module features a wide-range input for 24V AC/DC signals and provides one changeover contact output, suitable for switching various loads.

Specifications

• Manufacturer: Siemens
• Part Number: 3TX7002-1BB00
• Series: SIRIUS
• Product Type: Coupling Relay / Interface Converter
• Input Voltage (A1/A2): 24V AC/DC
• Input Power Consumption: 0.75W
• Output Contacts: 1 x Changeover (CO)
• Switching Capacity (AC15): 3A at 230V AC
• Switching Capacity (DC13): 1A at 24V DC
• Mounting: DIN Rail
• Terminal Connection: Screw terminals

Label Info

• Standard: IEC60947-5-1
• Max Surrounding Temperature: 40 deg C
• UL/cUL Rating: B300/R300

Application

This module is ideal for use as an interface in automation panels, connecting PLC digital outputs to higher-power devices like contactors, solenoid valves, and indicator lamps. It is also used for signal multiplication and electrical isolation.

Country of Origin

Made in Czech Republic.

CO2 Impact

Opting for this pre-owned unit prevents the emission of approximately 2.0 kg of CO2 compared to manufacturing a new one. This saving is equivalent to driving 10 km in a standard passenger car.

Availability

This is an obsolete item, available from our stock while supplies last. Order now from spareparts2day for expert support and fast delivery.

FAQ

Question?
What is the function of the small display on the 3TX7002-1BB00?

The display is not a user-programmable HMI. It’s a simple status indicator that can show the operating state, a diagnostic feature not commonly found on standard relays, providing at-a-glance information about the relay’s condition.

Question?
Can this relay be directly replaced by a standard electromechanical relay?

While a standard relay with the same voltage and contact ratings might work electrically, the 3TX7002-1BB00 is an interface converter designed for low-power PLC outputs. It has a very low input power consumption (0.75W) and built-in protective circuits. A standard relay might draw too much current for the PLC output to handle. Always check the PLC output specifications before substituting.

Question?
Is this module compatible with modern Siemens TIA Portal projects?

No, this is a legacy hardware component. It does not have any communication capabilities or integration features that would require it to be configured in TIA Portal. It functions as a simple hardware interface, so its operation is independent of the programming environment, but it would not appear in a modern hardware catalog.

spareparts2day is not an authorized distributor, reseller or representative of the products featured on this website. All product names, trademarks, brands and logos used on this site are the property of their respective owners.

Laatst bijgewerkt: Friday, March 13, 2026