TEMPEST COTS EMI Power Line Filter

Filters are listed per UL specification #1283
Temperature Range: Operating -55°C to +85°C
Enclosures are made from cold rolled steel with continuously welded seams
Filter ground path connecting surfaces shall be tin plated or stainless steel
Conduit hubs or clearance holes may be provided if specified when ordering
Each phase filter is individually removable
Internal filters are filed with a non-flammable impregnant and hermetically sealed
Legs for floor mounting may be provided if specified when ordering
Filters for 300AMP and up have 6” x 2” mounting U-Channel.

Attenuation 100dB from 14kHz to 18GHz measured under full load per Mil-Std 220C

130dB from 14kHz to 18GHz in Tempest application.

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DMC-FCP-11 Series 60 Hz & DMC-FCP-12 Series available for 400 Hz

Part Number	Current Rating (AMP)	Voltage Rating		Frequency Rating (Hz)	Dimensions (INCHES)					Weight Approx. (LBS)
Part Number	Current Rating (AMP)	LG / LL VAC	VDC	Frequency Rating (Hz)	A±.060	B±.060	C±.060	D±.060	E±.060	Weight Approx. (LBS)
DMC-FCULX-4 X 30E2	4 x 30	277 / 480	600	60	28	38	6	64	26	220
DMC-FCULX-4 X 60E2	4 x 60	277 / 480	600	60	28	41	8	64	29	315
DMC-FCULX-4 X 100E2	4 x 100	277 / 480	600	60	57	60	10	80	48	520
DMC-FCULX-4 X 225E2	4 x 225	277 / 480	600	60	28	60	16	64	48	750
DMC-FCULX-4 X 250E2	4 x 250	277 / 480	600	60	28	54	16	64	42	750
DMC-FCULX-4 X 300E2	4 x 300	277 / 480	600	60	60	72	16	66	44	850
DMC-FCULX-4 X 400E2	4 x 400	277 / 480	600	60	60	72	16	66	44	975
DMC-FCULX-4 X 500E2	4 x 500	277 / 480	600	60	60	72	16	66	44	1075
DMC-FCULX-4 X 600E2	4 x 600	277 / 480	600	60	45	72	34	38	44	1600
DMC-FCULX-4 X 800E2	4 x 800	277 / 480	600	60	60	72	34	66	44	2400
DMC-FCULX-4 X 1000E2	4 x 1000	277 / 480	600	60	60	72	34	66	44	2500
DMC-FCULX-4 X 1200E2	4 x 1200	277 / 480	600	60	96	72	34	64	44	2750
DMC-FCULX-4 X 1500E2	4 x 1500	277 / 480	600	60	96	72	34	64	44	2900

All Filter Cabinets are also available in 3 line and 4 line configuration

PART NO	CURRENT	VOLT AGE	FREQ	WIRE	FIGURE	DIMENTIONS (INCH)			INSERTION LOSS (DB)
PART NO	(AMP)	(VAC)	(HZ)	SIZE	No	A	B	C	14kHz	100kHz	10MHz	1GHz	18GHz
DMC-FCULX- 1×30-E2	1 x 30	277	0-60	#10	1	33	6	4.5	100	100	100	100	100
DMC-FCULX- 2×30-E2	2 x 30	277	0-60	#10	2	33	12	4.5	100	100	100	100	100
DMC-FCULX- 1×60-E2	1 x 60	277	0-60	#10	1	33	6	4.5	100	100	100	100	100
DMC-FCULX- 2×60-E2	2 x 60	277	0-60	#10	2	33	12	4.5	100	100	100	100	100
DMC-FCULX- 1×100-E2	1 x 100	277	0-60	#2	1	41	8.5	6	100	100	100	100	100
DMC-FCULX- 2×100-E2	2 x 100	277	0-60	#2	2	41	17	6	100	100	100	100	100
DMC-FCULX- 1×200-E2	1 x 200	277	0-60	250MCM	1	41	14	6	100	100	100	100	100
DMC-FCULX- 1×250-E2	1 x 250	277	0-60	250MCM	1	42	14	6	100	100	100	100	100

DMC PART NO	CURRENT RATING (AMP)	VOLTAGE RATING (VAC)	FREQ RATING (HZ)	WIRE SIZE	DIMENSIONS (INCHES)
DMC PART NO	CURRENT RATING (AMP)	VOLTAGE RATING (VAC)	FREQ RATING (HZ)	WIRE SIZE	A	B	C	D	E	F	G	H
DMC-FC-962	2 x 5	277	0-60	#10	24	7	4	36	1.75	19.25	9.25	6
DMC-FC-962A	2 x 5	277	0-400	#10	24	7	4	36	1.75	19.25	9.25	6
DMC-FC-1407	2 x 5	600	0-60	#10	24	8	7	36	1.75	19.25	10.25	6
DMC-FC-1407A	2 x 5	600	0-400	#10	24	8	7	36	1.75	19.25	10.25	6
DMC-FC-943	2 x 30	277	0-60	#10	24	7	7	36	1.75	19.25	9.25	6
DMC-FC-943A	2 x 30	277	0-400	#10	24	7	7	36	1.75	19.25	9.25	6
DMC-FC-1387	2 x 30	600	0-60	#10	24	8	7	36	1.75	19.25	10.25	6
DMC-FC-1387A	2 x 30	600	0-400	#10	24	8	7	36	1.75	19.25	10.25	6
DMC-FC-944	100	277	0-60	#2	34	4.5	6.5	36	2	26.25	6.75	9
DMC-FC-944A	100	277	0-400	#2	34	4.5	6.5	36	2	26.25	6.75	9
DMC-FC-1197	100	600	0-60	#2	34	8	6.5	36	2	26.25	10.25	9
DMC-IEC-1197A	100	600	0-400	#2	34	8	6.5	36	2	26.25	10.25	9
DMC-FC-945	225	277	0-60	4/0	41	8	8	36	2	27.25	10.25	15
DMC-FC-945A	225	277	0-400	4/0	41	8	8	36	2	27.25	10.25	15
DMC-FC-1198	225	600	0-60	4/0	41	8	8	36	2	27.25	10.25	15
DMC-FC-1198A	225	600	0-400	4/0	41	8	8	36	2	27.25	10.25	15

Each field wiring terminal and ground stud is provided with a set screw type lug .Each circuit is provided with discharge resistors. Each Filter available in Tempest configuration

Specifications

GENERAL

The filter herein described shall be designed for filtering of radio frequency interference and to meet the requirements of Military Specifications MIL-F-15733, where applicable. These filters may be used with other electrical devices to enable the devices to meet the requirements of MIL-I-26600, MIL-I-16910, MIL-I-6181, MIL-I-11748, MIL-STO-461, 462, 463, FED-STD-222 and FCC Specification Part 18. Also, DCA specifications and others developed for special equipment and systems applications.

ELECTRICAL

CURRENT RATING: The filters shall be capable of carrying full-rated current with a heat rise not exceeding 25°C above ambient temperature. The filters shall be capable of withstanding 150% of rated current overload for 15 minutes without any deterioration.

VOLTAGE: The filters shall be capable of operating continuously at full-rated voltage and of withstanding an over-voltage test of twice the rated voltage for one minute. Maximum voltage drop shall not exceed 2 volts when measured in accordance with MIL-F-15733. Maximum operating temperature: 85°C.

MECHANICAL

CASE: The inner cases of each filter shall be made of
C.R.S. 16 GA. min. Each phase filter shall be individually replaceable. All internal filters are hermetically sealed.

TERMINALS: The terminals shall be made of high temperature alumina ceramic and shall be leak proofed. The ceramic terminal shall have a flexible insulated lead, one end of which is permanently attached to the terminal, the other end in a permanently affixed lug mounted on , 7 approved flame-retardant stand-off insulator secured with a suitable screw. All connections shall be made only at the stand-offs.

IMPREGNANT: Where applicable the impregnant shall be non-flammable as classified by U.L. and MIL-F-15733.

CONSTRUCTION: Input and output terminals shall be completely enclosed in RF shielded compartments. Covers on the input and output RF shielded compartments shall be held down with screws. Gasketing shall be used between the cover and the inside fitting flange to maintain RF integrity. Internal components shall be mounted and fixed to prevent damage when subjected to applicable shock and vibration tests.

FINISH: All filter cases shall be made rust proof by painting over primer. All unfinished grounding surfaces are protected by suitable plating.

Frequently Asked Questions

What is a TEMPEST COTS EMI Power Line Filter and how does it work?

It’s a commercial off-the-shelf filter designed to block electromagnetic emissions on power lines. It works by suppressing conducted RF noise to protect sensitive electronics.

What current and voltage ratings are available for TEMPEST COTS EMI Power Line Filters?

Available ratings usually range from 1 A to 300 A and voltages from 120 V to 480 V AC. Custom ratings may be provided for specific systems.

What standards and military specifications are supported by TEMPEST EMI filters?

They often comply with TEMPEST, MIL-STD-461, and other EMI/EMC standards. This ensures suitability for secure military and government applications.

What frequency range attenuation does a TEMPEST COTS EMI Power Line Filter provide?

Typically, they attenuate from a few kHz up to several GHz. This ensures suppression of both low and high-frequency interference.

Why are TEMPEST EMI power line filters important for secure electronic systems?

They prevent electromagnetic leaks that could reveal sensitive data. They also protect systems from external EMI threats.

How does the filter prevent electromagnetic interference from entering or leaving equipment?

It uses inductors and capacitors to block unwanted high-frequency signals. This creates a barrier to EMI on both incoming and outgoing power lines.

What materials and construction features are used in TEMPEST EMI power line filters?

Filters use high-quality magnetic cores, capacitors, and shielded housings. Rugged metal enclosures ensure durability and effective EMI suppression.

Can TEMPEST EMI filters be customized for specific power systems or applications?

Yes, filters can be tailored for different voltages, currents, and connector types. Custom designs ensure optimal EMI suppression for any application.

What temperature range can the TEMPEST COTS EMI Power Line Filter operate in?

They typically operate between -40 °C to +85 °C. Some ruggedized models can handle even higher temperatures.

Are these filters suitable for shielded enclosures and secure facilities?

Yes, they are designed to integrate with RF-shielded rooms and secure electronics. They maintain TEMPEST-level protection when properly installed.

What Our Clients Say

Reliable EMI Power Line Filter for RF Interference Control

September 28, 2026

We’re very pleased with this EMI power line filter for our setup. It provides effective control of conducted RF interference on both incoming and outgoing power lines, helping us maintain a cleaner and more controlled electrical environment. Overall, it has been a practical solution for our requirements.

Nicole Lawson

High-Attenuation Solution for TEMPEST Applications

September 28, 2026

We’re very pleased with the attenuation performance of this product for our TEMPEST-related requirements. The stated attenuation of up to 130 dB provides strong performance for applications where signal isolation is important. The overall design feels well suited to demanding, security-focused environments.

Jason Whitaker

Flexible Filters for 60 Hz and 400 Hz Systems

September 23, 2026

We’re very pleased with the flexibility this filter range provides. Having options for both 60 Hz and 400 Hz systems makes it easier to match different power requirements and applications. The overall design feels practical and reliable for professional use.

Elena Harrington

Protected Filter Design for Demanding Applications

September 23, 2026

We’re very pleased with the design of these filters. The hermetically sealed internal filters provide added protection for the components, which is particularly useful in demanding applications. The overall construction feels robust and well suited for reliable long-term use.

Caleb Whitmore

Removable Phase Filters for Easy Maintenance

September 18, 2026

We’re very pleased with the practical design of these filters. The individual phase filters can be removed easily, which makes routine maintenance and servicing much more convenient. This feature helps simplify access when needed and makes the overall system easier to manage. A well-thought-out solution for professional installations.

Caroline Hughes

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