Voltage Limiting Devices

Electrical isolation of insulated track sections and earthed parts of installations
Safe equipotential bonding in case of a short-circuit or earth fault at the overhead contact line due to high-current-resistant welding of the electrodes
Discharge of lightning overvoltages without short-circuit formation due to lightning-resistant SDS ... voltage limiting device
Short-circuit withstand capability up to 25 kA_rms/ 100 ms; 36 kA_rms/ 75 ms

Mast adapter for SDS voltage-limiting device

For mounting on the mast support profile of a contact wire mast with Fl 8–12 mm.

Art.-Nr. 723199

MA SDS M12

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Voltage-limiting device for a power-frequency sparkover voltage of ≤ 940 V.

Art.-Nr. 923110

SDS 1

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VLD type (EN 50122-1)	VLD-F
Power frequency sparkover voltage (U_aw)	≤ 940 V
d.c. sparkover voltage (U_ag)	700 V -14% ... +28%
Impulse sparkover voltage	≤ 1400 V (1 kV/µs)
Self-extinguishing capability	300 A / 65 V
Lightning current discharge capacity (10/350 µs) 0.1x / 0.5x / 1x	5 kA
Lightning current carrying capability (10/350 µs)	100 kA
Safe short-circuit due to welding of the electrodes in case of alternating currents	≥ 2.5 kA / 1000 V / 30 ms, ≥ 1.5 kA / 1000 V / 100 ms
Safe short-circuit due to welding of the electrodes in case of direct currents	≥ 750 A / 250 ms
Additional short-circuit current rating	25 kA_rms/ 100 ms; 36 kA_rms/ 75 ms
Long-term current	1 kA_rmsfor t ≤ 120 s
Leakage current (I_lc)	< 1 µA for 100 V d.c.
Operating temperature range (T_U)	-40 °C ... +80 °C
To be mounted with	mast adapter MA SDS M12 or SIEMENS No. 8WL6503-xx
Approvals	EBA
DB drawing No.	4 Ebs 15.13.20 Sheet 2

Voltage limiting device for a d.c. sparkover voltage of 350 V.

Art.-Nr. 923117

SDS 2

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VLD type (EN 50122-1)	VLD-F
d.c. sparkover voltage (U_ag)	350 V +/- 20 %
Impulse sparkover voltage	≤ 900 V (1 kV/µs)
Lightning current discharge capacity (10/350 µs) 0.1x / 0.5x / 1x	2 kA
Lightning current carrying capability (10/350 µs)	25 kA
Safe short-circuit due to welding of the electrodes in case of direct currents	≥ 600 A / 250 ms
Additional short-circuit current rating	25 kA_rms/ 100 ms; 36 kA_rms/ 75 ms
Long-term current	1 kA_rmsfor t ≤ 120 s
Leakage current (I_lc)	< 1 µA for 100 V d.c.
Operating temperature range (T_U)	-40 °C ... +80 °C
To be mounted with	mast adapter MA SDS M12 or SIEMENS No. 8WL6503-xx

Voltage limiting device for a d.c. sparkover voltage of 550 V.

Art.-Nr. 923116

SDS 3

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VLD type (EN 50122-1)	VLD-F
d.c. sparkover voltage (U_ag)	550 V +/- 20 %
Impulse sparkover voltage	≤ 1000 V (1 kV/µs)
Lightning current discharge capacity (10/350 µs) 0.1x / 0.5x / 1x	2.5 kA
Lightning current carrying capability (10/350 µs)	25 kA
Additional short-circuit current rating	25 kA_rms/ 100 ms
Operating temperature range (T_U)	-40 °C ... +80 °C
To be mounted with	mast adapter MA SDS M12 or SIEMENS Nr. 8WL6503-xx

Voltage limiting device for a d.c. sparkover voltage of 230 V.

Art.-Nr. 923118

SDS 4

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VLD type (EN 50122-1)	VLD-F
d.c. sparkover voltage (U_ag)	230 V +/- 20%
Impulse sparkover voltage	≤ 650 V (1 kV/µs)
Lightning current discharge capacity (10/350 µs) 0.1x / 0.5x / 1x	2.5 kA
Lightning current carrying capability (10/350 µs)	25 kA
Impulse current discharge capacity (8/20 µs) 0.1x / 0.5x / 1x	20 kA
Safe short-circuit due to welding of the electrodes in case of direct currents	≥ 600 A / 250 ms
Additional short-circuit current rating	25 kA_rms/ 100 ms; 36 kA_rms/ 75 ms
Long-term current	1 kA_rmsfor t ≤ 120 s
Leakage current (I_lc)	< 1 µA for 100 V d.c.
Operating temperature range (T_U)	-40 °C ... +80 °C
To be mounted with	mast adapter MA SDS M12 or SIEMENS No. 8WL6503-xx

Voltage limiting device for a d.c. sparkover voltage of 120 V.

Art.-Nr. 923119

SDS 5

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VLD type (EN 50122-1)	VLD-F
d.c. sparkover voltage (U_ag)	120 V +/- 20 %
Impulse sparkover voltage	≤ 600 V (1 kV/µs)
Lightning current discharge capacity (10/350 µs) 0.1x / 0.5x / 1x	2 kA
Lightning current carrying capability (10/350 µs)	25 kA
Impulse current discharge capacity (8/20 µs) 0.1x / 0.5x / 1x	20 kA
Safe short-circuit due to welding of the electrodes in case of direct currents	≥ 600 A / 250 ms
Additional short-circuit current rating	25 kA_rms/ 100 ms; 36 kA_rms/ 75 ms
Long-term current	1 kA_rmsfor t ≤ 120 s
Leakage current (I_lc)	< 1 µA for 100 V d.c.
Operating temperature range (T_U)	-40 °C ... +80 °C
To be mounted with	mast adapter MA SDS M12 or SIEMENS No. 8WL6503-xx

Lightning current carrying capability (10/350 µs)	25 kA
Additional short-circuit current rating	21 kA_rms / 30 ms
Long-term current	1 kA_rms at t ≤ 120 s
Leakage current (I_lc)	< 1 µA at 100 V d.c.
Material	Brass
Degree of protection of the inner enclosure	IP 67
Dimensions of the threaded pin	M12