PCD 126A | Surge & Ring-Wave Coupling

PCD 126A - 6.6 kV Surge and Ring-Wave Coupling Network

Gallery PCD 126A - 6.6 kV Surge and Ring-Wave Coupling Network

PCD 126A - 6.6 kV Surge and Ring-Wave Coupling Network

Surge coupling for unbalanced lines, plus ring-wave coupling for balanced and unbalanced lines.

The Haefely PCD 126A couples combination-wave surge and 100 kHz ring-wave disturbances onto up to four unshielded data or control wires at 6.6 kV peak. Combination-wave testing is for asymmetrical lines; ring-wave testing supports both symmetrical and asymmetrical lines. Coupling elements and paths are selected manually, with decoupling supplied separately.

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HAEFELY EMC

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TEST STANDARDS:

IEC/EN 61000-4-12 ,
IEC/EN 61000-4-5 ,

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PCD 126A Datasheet V2026.06

SPECIFICATIONS

HAEFELY EMC ACCESSORIES

PCD 126A - 6.6 kV Surge and Ring-Wave Coupling Network

Surge coupling for unbalanced lines, plus ring-wave coupling for balanced and unbalanced lines.

Overview and application

Safety banana sockets make the selected coupling path visible.
Use DEC 7 for appropriate asymmetrical-line decoupling; select the decoupling network for the line type, bandwidth and EUT voltage.
Manufacturer-listed generators include PIM 100 / PIM 110 on the Surge Platform and PSURGE 4010. AXOS 5/8 list PCD 126A as an accessory; ring-wave testing requires a ring-wave-equipped generator.
Use PCD 121 for symmetrical combination-wave coupling; PCD 126A alone does not cover that case.

Technical specifications

Specification	Details
Function	Coupling network only; separate decoupling required
Line capacity	Up to 4 wires simultaneously
Combination wave	1.2/50 us - 8/20 us; Z = 2 ohm; asymmetrical lines
Ring wave	100 kHz; Z = 12, 30 or 200 ohm; symmetrical or asymmetrical lines
Maximum impulse amplitude	6.6 kV for both impulse shapes
Series resistor	1 x 40 ohm for IEC 61000-4-5 testing
Path selection	Manual common-mode and differential-mode coupling
Capacitive coupling	0.5 uF / 3 uF; asymmetrical lines, both impulse shapes
ABD coupling	Asymmetrical lines for both waveforms; symmetrical lines for ring wave only
Gas-arrestor coupling	Symmetrical lines, ring wave only
Direct coupling	Output for customer-specified coupling elements
EUT voltage with capacitors	Maximum 375 V DC or 265 V AC RMS
EUT voltage with ABDs or gas arrestors	Maximum 72 V DC or 50 V AC RMS
Signal bandwidth with capacitors	Greater than 1 kHz, as stated in the datasheet
Signal bandwidth with ABDs	Greater than 1 MHz, as stated in the datasheet
Signal bandwidth with gas arrestors	Greater than 10 MHz, as stated in the datasheet
Dimensions (W x D x H)	450 x 570 x 195 mm (17.7 x 22.4 x 7.7 in)
Weight	Approximately 12 kg net (26.5 lb)

Included components

PCD 126A coupling network
Fischer-Fischer HV cable
Cable set
Short-circuit bridge
User manual

Generator, EUT, auxiliary equipment and other coupling/decoupling networks are separate system equipment unless explicitly included above.

Standards and system configuration

IEC/EN 61000-4-5 Edition 2, Figures 11-13; Edition 3, Figure 9.
IEC/EN 61000-4-12 Edition 2, Figures 9-11; Edition 3, Figure 8.

Compare data-line coupling and decoupling networks

Product	Function	Signal circuit	Test waveform	Key ratings
PCD 121	Coupling	Symmetrical; 2 pairs / 4 wires	Combination wave	6.6 kV; selectable gas arrestor / ABD coupling
PCD 126A	Coupling	4 wires; asymmetrical surge; symmetrical or asymmetrical ring wave	Combination wave; 100 kHz ring wave	6.6 kV; capacitors, ABDs, gas arrestors or direct
DEC 5	Decoupling	Symmetrical; 4 wires	Combination, telecom and ring wave	6.6 kV; 20 mH compensated; 1 A
DEC 6	Decoupling	Symmetrical; 4 wires	Combination, telecom and ring wave	6.6 kV; 200 ohm; 0.1 A
DEC 7	Decoupling	Asymmetrical; 4 wires	Combination and ring wave	6.6 kV; 20 mH uncompensated; 1.5 A
PCD-1000-4	Coupling + decoupling	Balanced Ethernet; 1 / 2 / 4 pairs; 1000Base-T	Combination wave	4 kV / 150 A surge; 65 V DC / 1 A line; IEEE 802.3af PoE

Combination wave: 1.2/50 us voltage and 8/20 us current. Telecom wave: 10/700 us voltage and 5/320 us current. Ratings depend on the selected coupling/protection elements; review each product specification before configuring the system.

PCD 121 and PCD 126A provide coupling only. DEC 5, DEC 6 and DEC 7 provide decoupling/protection only. PCD-1000-4 combines both functions for high-speed Ethernet. IP4B is an EFT/burst clamp and is intentionally excluded from this matrix.