Surge Arresters | Surge Protection Devices

Surge Arresters | DSP1A/SSI/120

Surge Protection Devices

The DSP1A/SSI/120 manufactured by PD Devices Ltd is based on the successful DSP range of surge arresters and uses technology that has been proven in locations with some of the highest Keraunic levels worldwide.

It offers protection for signals, points, level crossings, and other systems. Additionally, the device features protection status indication and remote signalling capabilities. It helps reduce the failure rate of TFMs, prolongs the service life of equipment, and meets the requirements of Network Rail specification (PAD’s No: 0086/000060).

Surge Protection Devices Specification

Operating Voltage Range (AC or DC)	90 to 150V rms or DC
Nominal Voltage (AC or DC)	120V rms or DC
Frequency Range (For AC installation)	40 to 60 Hz
Maximum Surge Current, Imax (8/20μs)	30kA
Voltage protection level, Up (6kV/3kA CWG)	400V
Response Time	<10ns
Power Consumption (Nominal)	18mA
Earth Leakage Current	200μA
Screw Terminals	16sqmm max – Line, Neutral, Earth 2.5sqmm max – Remote Signalling
Status Indication	Green – Full Protection Red & Green – Reduced Protection Red – No Protection
Operating Temperature*	-40 °C to +70 °C
Case	Steel, Epoxy Coated
Dimensions (mm)	186mm (length), 47mm (width), 72mm (height)

*Unit can be operated at a higher temperature if de-rated, please ask for details.

DSP1A/SSI/120 Dimensions

AN Wallis & PD Devices LTD

Overvoltage Protection for Power Generation Equipment

SPD | Surge Protection Devices | Earthing & Lightning Protection

AN Wallis has fully acquired PD Devices Ltd, making it a 100% subsidiary of the Wallis Group.

PD Devices Ltd specialises in the design and manufacture of Earthing, Lightning Protection & Surge Protection Systems.

The PD Devices range of Surge Protection Devices (SPD’s) protect against transient over-voltages and increase the reliability of Low & High Voltage electrical equipment systems utilising their Metal Oxide Varistor (MOV) technology: this includes standard Mains Power, Data, Photovoltaic Protection & Equipotential Bonding applications.

Specialist application Surge Protection Devices include: Solid State Interlocking (SSI) | Airfield Lighting Circuits | Rail Trackside (internal linked)

AN Wallis, based in the UK are a leading manufacturer of Earthing & Lightning Protection Products, using high conductivity copper to BS EN 13601 – their earthing products are installed to protect buildings, overhead lines and low/medium/high voltage substations (LV-MV-HV) against potentially catastrophic damage that can be caused by a lightning strike resulting in short circuiting.

The Wallis product range includes copper earth rods (solid copper, copper bond and stainless steel types), earth bars, copper tape, earth clamps and aluminium tapes.

Data Sheets