Description

Used product. Original Schaffner FN2200B-250-99 EMC/RFI filter, designed for electromagnetic interference filtering on the DC line in power applications, particularly photovoltaic inverters and high-power conversion systems.
The photographed component is the FN2200B-250-99 version, with a maximum voltage of 1200 VDC and rated current of 250 A at 55 °C. The -99 configuration provides input and output connections via busbars, as clearly visible on the component.
The label identifies two distinct sides of the filter: PV-FIELD and INVERTER, with + / − / PE connections. The filter is therefore installed between the photovoltaic DC field and the DC input of the inverter, attenuating conducted disturbances generated by power electronic equipment. Schaffner/TE documentation identifies the model as a single-stage DC EMC/EMI filter, 250 A, 1200 VDC, with busbar input and output.

⚙️ Technical Specifications

• Manufacturer: Schaffner
• Series: FN2200
• Model: FN2200B-250-99
• Schaffner/TE code: 803517-SF
• Type: DC current EMC/EMI filter
• Configuration: single-stage
• Application: DC / photovoltaic / inverter
• Maximum voltage: 1200 VDC
• Rated current: 250 A @ 55 °C
• Catalog indicated overload current: approx. 288 A
• Input connection: busbar
• Output connection: busbar
• Input side: PV-FIELD
• Output side: INVERTER
• Polarity: + / −
• Protective connection: PE
• Mounting: chassis mounting
• Cooling: natural convection
• Dimensions: approx. 300 × 180 × 110 mm
• Weight: approx. 5 kg
• Operating temperature: −40…+100 °C
• Overvoltage category: II
• Pollution degree: PD2
• Protection rating: IP00
• Flammability class: UL94 V-2
• Environmental category: 40/100/21
• Differential-mode attenuation at 150 kHz: approx. 18 dB
• Standards: IEC/EN 60939, UL 1283, CSA
• Approvals: cURus / ENEC
• Visible identification number: 6034974
• Marking: 06 / 1027R
  The official data confirm 250 A, 1200 VDC, 300 × 180 × 110 mm, approx. 5 kg, with chassis mounting, busbar input and output, and natural convection cooling.

⚡ Function in the Electrical System

The Schaffner FN2200B-250-99 is designed to reduce conducted electromagnetic interference on the DC line.
In photovoltaic inverters, high-frequency switching stages can generate interference components that propagate along the DC connections. The filter uses its inductive and capacitive elements to attenuate these high-frequency components, improving the electromagnetic compatibility (EMC) of the system.
The connection must follow the direction indicated by the manufacturer:
PV-FIELD → photovoltaic field side
INVERTER → inverter side
Correct connection of the + and − polarities and the PE connection is essential for proper system operation.

☀️ Photovoltaic Applications

The FN2200B-250-99 is particularly suitable for applications with high-power photovoltaic inverters, where high DC current ratings are required.
TE/Schaffner documentation explicitly identifies the FN2200 family as a high-performance EMC/RFI filtering solution for photovoltaic inverters, with versions available for very high currents.
The 250 A / 1200 VDC model is therefore suitable for high-power DC systems, always verifying compatibility with voltage, current, busbar sizing, and inverter configuration.

🔧 Faults, Errors and Symptoms

A damaged or incorrectly connected DC filter may cause:

• increased EMC/RFI interference;
• increased conducted emissions;
• electromagnetic compatibility problems;
• interference with electronic equipment;
• abnormal heating of the connections;
• abnormal voltage drop along the DC path;
• irregular inverter operation in the presence of interference;
• damage or deterioration of the filter's internal elements;
• abnormalities caused by loose or oxidized connections.
  However, an inverter problem must not automatically be attributed to the filter: the PV field, DC wiring, connections, inverter, and other EMC components must also be checked.

🛠️ Inspection and Verification

For professional verification of the FN2200B-250-99, it is advisable to check:

• enclosure integrity;
• condition of the connection busbars;
• connection tightness;
• possible oxidation of the terminals;
• continuity of the + and − path;
• insulation to PE;
• any signs of overheating;
• integrity of the internal elements;
• any abnormal voltage drop;
• correct filter behavior during a controlled test.
  Verification must be performed using instruments and procedures suitable for the presence of DC voltages up to 1200 V and currents up to 250 A.

🏭 Construction and Product Condition

The photographed component is used and shows evident signs of previous installation and handling, including scratches, oxidation on the busbars and hardware.
The power conductor busbars, their insulators, and the input/output connections are present. The metal enclosure appears structurally intact in the photographs.

🌐 Applications

The Schaffner FN2200B-250-99 is primarily intended for:

• photovoltaic inverters;
• DC/AC conversion systems;
• high-power photovoltaic systems;
• power electronic equipment;
• systems where EMC interference on the DC line must be limited;
• installations with high DC currents.
  The photographed version is particularly suitable for applications requiring 250 A and up to 1200 VDC, with busbar connections.

🛡️ Safety

The component operates on high-voltage and high-current DC circuits. Even when the system appears to be switched off, dangerous voltages may be present from the photovoltaic field or circuits with stored energy.
Installation, disconnection, inspection, and maintenance must only be carried out by qualified personnel, using procedures suitable for circuits up to 1200 VDC / 250 A.
It is essential to respect the + / − polarity, PV-FIELD / INVERTER direction, and PE connection indicated on the label.

📦 Package Contents

1 × Schaffner FN2200B-250-99 DC EMC/RFI filter, 1200 VDC – 250 A @55 °C, with busbar connections and mounting components visible in the photographs.

🚀 Final Description

The Schaffner FN2200B-250-99 is a high-power DC EMC/RFI filter, designed for photovoltaic applications and inverter systems, with a rated capacity of 250 A at 55 °C and a maximum voltage of 1200 VDC.
The PV-FIELD / INVERTER configuration, with + / − and PE polarity, clearly identifies its use as a filter installed on the DC line between the photovoltaic field and inverter. The -99 version uses power connections via busbars, suitable for handling high currents.