Single and Three Phase Common Mode HEMP Power Line Filters from EMIS

­Global EMC solutions provider EMIS 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.

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 (8/20μs) which provides protection against lightning-induced surges and power switching transients.

Standard Performance models provide 100 dB insertion loss from 30 MHz to 18 GHz, followed by 90 dB attenuation up to 40 GHz. Extended-performance models provide 100 dB attenuation from 14 kHz to 40 GHz, 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, minimizing 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.

EMIS aims to offer an end-to-end solution to meet industry’s ongoing EMI Challenges. With a robust global supply footprint across eight industry segments, EMIS is continuously investing in technology and skills to deliver its promise of efficiency with seamless customer support.

EMI Solutions has been designing and manufacturing EMI filters for more than 40 years and is a global source for efficient EMI and EMC solutions across all industries, applications and the frequency spectrum. Products available include EMI/EMC Components, Feedthrough Components, Power Quality, Military Grade Filters and Surge Protection.

Customers are supported by a very experienced consulting team, a fully equipped Pre-Compliance Lab and a huge safety certified standard product offering of over 2500 part-numbers produced in their own very efficient facility.

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