3-Phase Filters FN351

General Purpose EMC Filter


General Purpose EMC Filter

  • EMC solution for industrial inverters and motor drives
  • Rated currents from 8 to 280 A
  • Selectable voltage level of 440 V and 520 V
  • High differential and common-mode attenuation

Features and Benefits

Broad range of power ratings for fast and convenient filter selection
Available as 440 VAC (FN 351) and 520 VAC (FN 351 H) versions for network-specific applications
FN 351 filters provide a broadband common and differential-mode attenuation performance, which remains available also when high interference levels are present
Solid, touch-safe filter terminals contribute to overall equipment safety
Introduced as one of the very first motor drive EMC filters in the market, FN 351 has been widely imitated and has success- fully proven its function over more than 10 years

Typical Applications

Three-phase motor drives
Inverters and converters
Industrial automation equipment
General purpose three-phase filtering

Technical Specifications

Maximum continuous operating voltage

3x 520/300 VAC (FN 351 H)

3x 440/250 VAC (FN 351)

Operating frequency

DC to 60 Hz

Rated currents

8 to 280 A @ 40°C

High potential test voltage

P –> P 2250 VDC for 2 sec (FN 351 H)

P –> E 2600 VDC for 2 sec (FN 351)

P –> P 1900 VDC for 2 sec (FN 351)

P –> E 2750 VDC for 2 sec (FN 351 H)

Protection category

IP 20

Overload capability

4x rated current at switch on,

1.5x rated current for 1 minute, once per hour

Temperature range (operation and storage)

-25°C to +100°C (25/100/21) (FN 351 H)

-25°C to +85°C (25/085/21) (FN 351)

Flammability corresponding to

UL 94 V-2 or better

Design corresponding to

UL 1283, CSA 22.2 No. 8 1986, IEC/EN 60939

MTBF @ 45°C/480 V (Mil-HB-217F)

135,000 hours

Typical electrical schematic


Approvals & Compliances

RoHS Label
UL Recognized Label
ENEC 14 Label
CSA Label
C CSA US Label
CE Label
UKCA Label

Approvals up to 110 A