HEMP power line filters

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 to 3000A, they are suitable for supporting applications ranging from control panels and communication equipment to high-current facility power distribution systems. The EMIS HEMP filter design features Integrated 80kA peak surge-current protection (8/20μs) which provides protection against lightning-induced surges and power switching transients.

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

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 ≤10 A and no damage to the filter during E2 testing
 

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.

Applications include:

• EMP Shielded Mobile Shelters: Provides HEMP and EMI protection at power entry points, safeguarding critical electronic and communication in mobile and rapidly deployable facilities.
• EMP Racks: Protects sensitive equipment within EMP-protected racks by suppressing conducted HEMP, EMI/RFI and power-line transients.
• Command and Control Centres: Protects mission-critical communication, surveillance, command, and control systems from HEMP and conducted electromagnetic disturbances, ensuring reliable operation.
• Data Centres: Protect critical servers, networking equipment, UPS systems, and other IT infrastructure against HEMP, EMI/RFI, and power-line disturbances, helping maintain continuous operation.
• Combat / Tracked Vehicles: Protect vehicle power systems against HEMP and EMI, supporting reliable operation of communication, navigation, electronic warfare and other mission-critical electronic equipment.
• Radar Power Supplies: Provides protected and low-noise power to radar systems, minimising conducted electromagnetic interference and supporting reliable signal processing and operational performance.
• MIL-Grade Panels: Integrated into military-grade power distribution panels to provide HEMP, EMI/RFI, and transient protection for critical defence electronic systems.
• Communication & Electronic Warfare Systems: Protect sensitive communication, surveillance and electronic warfare equipment against conducted HEMP and EMI disturbances on power lines, enhancing system reliability in demanding electromagnetic environments.
• Critical Infrastructure: Protect facility power systems and connected electronic equipment in telecommunications, utilities, transportation, and other mission-critical facilities against HEMP, EMI/RFI, and power-line disturbances, supporting reliable and continuous operation.

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