MIL-STD-188-125-1A Hemp Filter Range

This range of filters is the latest in high-altitude electromagnetic protection (HEMP) for power lines. MPE have designed these filter circuits from the ground up in order to be compliant with the stringent E1 and E2 pulse current injection and shielding effectiveness requirements of the latest United States MIL-STD-188-125-1A protection standard. These high performance filters also protect equipment from the effects of intentional electromagnetic interference (IEMI).

All lines are individually filtered and feature inductive input to offer both good continuous wave electromagnetic compatibility (EMC) performance and superior transient handling performance even on supplies with low source impedance. All lines are fitted with high-energy transient suppressors.

Insertion Loss Performance

Asymmetric attenuation shown as measured in 50Ω system with or without load, in accordance with MIL-STD-220C, CISPR-17 and BS EN 55017.

• Single-Line
• 2-Line
• 3-Line
• 4-Line
• Shielding Effectiveness
• Applications
• Downloads

Rated Current (A)	Part Number	DC Resistance (mΩ)	Max. Earth Leakage* (A)	Residual Current [2.5kA] (A)	Length A (mm)	Width B (mm)	Height C (mm)	Terminal Size
32	HPS32-1	10	1.8	5.3	430	180	165	M8
63	HPS63-1	5	1.8	4.6	680	270	215	M8
100	HPS100-1	2	6.3	5.9	680	270	215	M8
200	HPS200-1	1	12.5	6.2	940	270	215	M12
250	HPS250-1	0.5	15	5.6	1250	270	215	M16
400	HPS400-1	0.5	15	4.4	1250	270	215	M20
800	HPS800-1	0.1	26	4.4	1600	310	320	50x8 busbar
1200	HPS1200-1	0.1	26	4.4	1600	310	320	80x10 busbar

Rated Current (A)	Part No.	A	B	C	D	E	F
32	HPS32-2	395	755	165	430	180	160
63	HPS63-2	590	1125	215	680	270	220
100	HPS100-2	590	1125	215	680	270	220
200	HPS200-2	590	1385	215	940	270	220
250	HPS250-2	590	1855	215	1250	270	300
400	HPS400-2	590	1855	215	1250	270	300
800	HPS800-2	680	2805	320	1600	310	600
1200	HPS1200-2	680	2805	320	1600	310	600

Rated Current (A)	Part No.	A	B	C	D	E	F
32	HPS32-3	610	755	165	430	180	160
63	HPS63-3	810	1125	215	680	270	220
100	HPS100-3	810	1125	215	680	270	220
200	HPS200-3	810	1385	215	940	270	220
250	HPS250-3	810	1855	215	1250	270	300
400	HPS400-3	810	1855	215	1250	270	300
800	HPS800-3	1050	2805	320	1600	310	600
1200	HPS1200-3	1050	2805	320	1600	310	600

Rated Current (A)	Part No.	A	B	C	D	E	F
32	HPS32-4	825	755	165	430	180	160
63	HPS63-4	1230	1125	215	680	270	220
100	HPS100-4	1230	1125	215	680	270	220
200	HPS200-4	1230	1385	215	940	270	220
250	HPS250-4	1230	1855	215	1250	270	300
400	HPS400-4	1230	1855	215	1250	270	300
800	HPS800-4	1420	2805	320	1600	310	600
1200	HPS1200-4	1420	2805	320	1600	310	600

Frequency	10kHz	100kHz	1MHz	10MHz	100MHz	1GHz
Minimum Shielding Effectiveness to meet MIL-STD-188-125-1A	20dB	40dB	60dB	80dB	80dB	80dB
Typical Filter Shielding Effectiveness	30dB	50dB	75dB	100dB	100dB	100dB

• Fixed ground-based C⁴I military facilities
• New build & upgrade facilities requiring HEMP protection to MIL-STD-188-125-1A

HPS-1A Filter Catalogue

HPS32-2X277

• Select the Filter Prefix HPS 
• Select 2, 3 or 4 digits to reflect the current rating required
• Select 1X, 2X 3X or 4X to reflect the number of lines required 
• Select either 120, 250 or 277 for voltage rating required