{"id":33326,"date":"2026-08-13T09:30:00","date_gmt":"2026-08-13T08:30:00","guid":{"rendered":"https:\/\/www.engineernewsnetwork.com\/blog\/?p=33326"},"modified":"2026-08-12T09:38:56","modified_gmt":"2026-08-12T08:38:56","slug":"single-and-three-phase-common-mode-hemp-power-line-filters","status":"publish","type":"post","link":"https:\/\/www.engineernewsnetwork.com\/blog\/single-and-three-phase-common-mode-hemp-power-line-filters\/","title":{"rendered":"Single and three phase common mode HEMP power line filters"},"content":{"rendered":"\n

EMC solutions provider\u00a0EMIS<\/a>\u00a0<\/strong> offers a range of EMI powerline filters designed to protect sensitive electrical and electronic equipment against High-Altitude Electromagnetic Pulse (HEMP) and conducted Electromagnetic Interference (EMI\/RFI) resulting from high-energy electromagnetic events, including nuclear-induced electromagnetic disturbances and lightning-related transients.<\/p>\n\n\n\n

EMIS SMF913 and TMF913HEMP EMI Power Line Filters provide single phase and three phase configurations, and suitable for a wide range of AC and DC facility power applications. With current ratings from 6 A to 3000 A, they are ideal for supporting applications ranging from control panels and communication equipment to high-current facility power distribution systems. The EMIS HEMP filter design features Integrated 80 kA peak surge-current protection (8\/20\u03bcs) which provides protection against lightning-induced surges and power switching transients.<\/p>\n\n\n\n

Standard Performance models provide 100dB insertion loss from 30MHz to 18GHz, followed by 90dB attenuation up to 40GHz. Extended-performance models provide 100dB attenuation from 14kHz to 40GHz, offering enhanced protection against both low-frequency conducted interference and high-frequency electromagnetic disturbances. Built-in discharge resistors safely dissipate energy stored in internal capacitors after power is switched off, improving operator safety and reducing maintenance hazards<\/p>\n\n\n\n

The EMIS HEMP filters are designed in accordance with the requirements of MIL-STD-188-125-1\/2 and MIL-PRF-15733J, supporting HEMP-hardened facility and high-performance EMI\/RFI protection applications and tested in accordance with MIL-STD-188-125-1\/2 to withstand specified E1 Short Pulse and E2 Intermediate Pulse current injection levels under common-mode and line-to-ground conditions, with E1 residual current limited to \u226410 A and no damage to the filter during E2 testing<\/p>\n\n\n\n

EMIS HEMP filters help to prevent equipment malfunction, reduce communication and control errors, minimise system downtime and enhance the reliability and service life of connected equipment.<\/p>\n\n\n\n

Applications include:<\/p>\n\n\n\n