Siemens 3RT2047-3SP30 Power Contactor 110A, 55kW, S3 Size with Spring-Loaded Terminals Original Brand New

Overview: Siemens 3RT2047-3SP30 Power Contactor

The Siemens 3RT2047-3SP30 is a high-performance power contactor designed for reliable motor and load switching applications in demanding industrial environments. Part of the SIRIUS 3RT2 series, this robust 3-pole contactor is engineered for use in AC-3 and AC-3e applications, capable of handling a significant 110 A current and 55 kW at 400 V. Its compact S3 size makes it suitable for integration into various control panels and systems.

A standout feature is the integrated varistor, which provides surge protection and enhances the longevity of the device by suppressing voltage spikes. The dual-purpose main circuit connections utilize reliable screw terminals, while the control and auxiliary circuits feature convenient and secure spring-loaded terminals, reducing wiring time and maintenance. The “F-PLC-IN” designation signifies its compatibility with F-PLC inputs, making it an ideal component for use in safety-related circuits and functional safety systems.

Key Features & Technical Specification

• Product Type: Power Contactor
• Part Number: 3RT2047-3SP30
• Current Rating: 110 A (AC-3e/AC-3)
• Power Rating: 55 kW at 400 V
• Number of Poles: 3-pole
• Operating Voltage: 175-280 V AC/DC (50/60 Hz)
• Auxiliary Contacts: 1 NC (Normally Closed)
• Integrated Protection: Built-in varistor for surge suppression
• Terminal Type (Main Circuit): Screw terminal
• Terminal Type (Control & Auxiliary Circuit): Spring-loaded terminal
• Size: S3
• Compatibility: F-PLC-IN (Functional Safety PLC Input)

Benefit

• Exceptional Durability: The integrated varistor protects against voltage surges, extending the contactor’s operational life.
• Flexible Wiring: Combines the security of screw terminals for high-power main circuits with the fast, reliable connection of spring-loaded terminals for control wiring.
• High Performance: Rated for demanding motor and load switching applications with a high current capacity.
• Space-Saving Design: The compact S3 frame size allows for efficient use of panel space.
• Enhanced Safety: “F-PLC-IN” compatibility makes it a safe and reliable choice for integration into functional safety systems.
• Reduced Installation Time: Spring-loaded terminals simplify and speed up the wiring process, reducing labor costs.

Function

The Siemens 3RT2047-3SP30 power contactor serves as a critical electromechanical switch. Its primary function is to remotely and safely control the flow of electrical power to a three-phase motor or another large load. When the control circuit is energized (within the 175-280 V AC/DC range), the contactor’s coil pulls the main contacts closed, allowing power to flow to the connected equipment. The integrated NC auxiliary contact can be used for signaling a control system that the main circuit is de-energized, or for interlocking with other components.