📝 Description

Used product. Schaffner FS23418-38-33 EMC/EMI filter, designed for DC applications and intended to reduce conducted interference on the DC lines of power electronic equipment, particularly inverters, converters, and photovoltaic systems. The exact code visible on the label is FS23418-38-33, while the associated part number is 43,0001,1298-100. The component is also identified with Schaffner code 803002 in product management documents.

⚙️ Technical Specifications

• Brand: Schaffner
• Model: FS23418-38-33
• Part Number: 43,0001,1298-100
• Schaffner Code: 803002
• Type: DC EMC/EMI filter
• Rated Voltage: 600 VDC
• Rated Current: 38 A @ 50 °C
• System: DC
• Frequency: DC / not applicable
• Configuration: + / − line
• Connections: LINE / LOAD
• Connection Direction: LINE input, LOAD output
• Mounting: panel / chassis
• Cooling: passive, through the metal structure
• Temperature/Climatic Class: 25/100/21, as indicated on the nameplate
• Construction: metal housing with internal filtering elements
• Production: Made in Thailand
  The 38 A @ 50 °C marking indicates the rated current specified by the manufacturer at the reference ambient temperature of 50 °C. The maximum voltage indicated on the nameplate is 600 VDC.

⚡ Function in the Electrical System

The FS23418-38-33 is a DC line filter. Its function is to reduce conducted electromagnetic interference generated by electronic switching stages, limiting the propagation of interference along the positive and negative conductors.
It is therefore particularly suitable for integration into equipment such as:

• photovoltaic inverters;
• DC/DC converters;
• power converters;
• industrial power supplies;
• energy conversion systems;
• electronic equipment with high switching interference.
  The visible LINE / LOAD and + / − configuration confirms that the component must be installed in series with the DC line, respecting the polarity and installation direction specified by the manufacturer.
  Schaffner specializes in EMC/RFI solutions for controlling electromagnetic interference in electronic and power systems.

🔌 Connections

The label clearly identifies the four functional connection points of the filter:
LINE

• +
• −
  LOAD
• +
• −
  The connection must strictly respect the polarity and LINE/LOAD side.
  The photographed component also features two pre-wired conductors, with terminals prepared for electrical connection. The cables are part of the photographed assembly and are supplied as shown in the images.

🏭 Construction and Installation

The filter features a shielded metal housing, two lateral/lower mounting brackets, and dedicated power connections for the DC line.
The metal structure contributes to interference management and heat dissipation of the component. There is no dedicated fan: the component is designed for passive heat dissipation.
The filter must be installed in an environment compatible with its thermal class and with sufficient space for heat dissipation. The 25/100/21 value shown on the nameplate identifies the climatic class of the component.

☀️ Photovoltaic Applications

The 600 VDC / 38 A configuration makes this filter particularly suitable for the DC section of photovoltaic inverters and conversion systems.
In a PV system, it can be used to help reduce high-frequency interference present between the positive and negative DC conductors, improving the electromagnetic compatibility of the equipment.
It is nevertheless necessary to verify voltage, current, polarity, wiring diagram, and code compatibility before installing it on a specific inverter.

🛡️ Safety and Product Condition

The component is used and shows normal signs of previous installation, with light abrasions and superficial marks on the housing. The connections and mechanical structure are visibly present.
As a component rated for 600 VDC / 38 A, it must be considered a high-voltage power device. Before any intervention, ensure that the circuit is completely de-energized and that any capacitors connected upstream or downstream are discharged.
During installation, the following must be respected:

• 600 VDC maximum;
• 38 A @ 50 °C;
• correct + / − polarity;
• correct LINE → LOAD direction;
• appropriate conductor cross-sections;
• correct protection and disconnection systems.

📦 Package Contents

• 1 × Schaffner FS23418-38-33

🚀 Final Description

Original Schaffner FS23418-38-33, DC EMC/EMI filter, rated 600 VDC / 38 A @ 50 °C, designed to suppress conducted interference in power electronic equipment. The component features LINE +/− on the input side and LOAD +/− on the output side, with a metal housing and wired connections.
It is particularly suitable as a replacement for photovoltaic inverters, DC/DC converters, and industrial power equipment requiring EMC filtering on the DC line.