Siemens 4RY8403-0EB11 Power Factor Controller

Description

The Siemens 4RY8403-0EB11 is a reliable and intelligent Power Factor Controller (Blindleistungsregler) designed for automatic reactive power compensation. It monitors the power factor of an electrical system and switches capacitor banks in or out through its 6 relay outputs to maintain a target power factor. This process reduces reactive power demand, lowers energy costs, and improves overall power quality and system stability. Its panel-mount design and clear interface make it a staple in industrial control cabinets.

Specifications

• Manufacturer: Siemens
• Model: 4RY8403-0EB11
• Product Type: Power Factor Controller
• Number of Control Steps: 6
• Supply Voltage: 230V AC (+/- 15%), 50/60Hz
• Measurement Voltage: 200-700V AC, 50/60Hz
• Relay Contact Rating: max. 250V AC, 5A
• Communication: Optical RS-232 Interface
• Mounting: Panel Mount

Label Info

• Siemens 4RY8403-0EB11
• Blindleistungsregler / Power Factor Controller
• Internal ID: 7889-01

Application

This controller is widely used in industrial facilities, commercial buildings, and manufacturing plants to manage power factor correction systems. It is essential for applications with significant inductive loads, such as motors, transformers, and lighting ballasts, helping to avoid utility penalties for poor power factor.

Country of Origin

Germany

CO2 Impact

Reusing this component saves approximately 32 kg of CO2, contributing to a more sustainable industrial environment compared to manufacturing a new one.

Availability

This is an obsolete item, available as a refurbished spare part. Limited stock available. Order now from PLC2Day for expert support and fast delivery.

FAQ

The RS-232 optical interface is used for parameterization, diagnostics, and data readout using a PC with appropriate Siemens software. It allows for safe, galvanically isolated communication with the device.

Yes, the controller is programmable. You can configure it to use any number of steps up to its maximum of six, depending on the requirements of your specific power factor correction system.

The device is designed to work with standard current transformers with a secondary output of either 1A or 5A. The correct CT ratio must be programmed into the controller to ensure accurate power factor measurement and correction.

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Laatst bijgewerkt: Friday, March 13, 2026