GDT Provides Surge Protection for Power Supplies

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Power Supply Lightning/Surge Protection: Y08SV-312B
Sankosha's GDT Desgined Specificaly For Power Supplies Y08SV-312B
Sankosha’s Gas Tube Arrester Model Y08SV-312B was developed to provide the highest level of protection possible for consumer electronics and other equipment while also meeting the IEC and UL requirements for line isolation from ground. The 3700V maximum Impulse Breakdown Voltage of the Y08SV-312B is well below the typical withstand voltage of protected equipment and its minimum DC Breakdown Voltage of 2850V enables this gas tube to pass the stringent Class Y2 requirements of the Sixth Edition of UL 1414.

Power Supply manufacturers must develop protection circuitry on the input side but the IEC (IEC60950) and Underwriters Laboratories (UL 1414) both require line isolation from ground to protect people from possible hazard. Recent changes in UL 6500, for example, dictate the use of double or reinforced insulation to achieve the required additional level of safety. Equipment must be designed so that accessible conductive parts cannot become hazardous live in the event of a failure of the basic insulation. The UL 1414 Y2 Recognized Y08SV-312B provides this reinforced isolation.

Power supply equipment isolation must be maintained during 1.5kV AC Hi Pot testing and circuitry must be protected when impulse breakdown waveforms as defined by IEC61000-4-5 are applied. The Y08SV-312B is designed to meet these conflicting requirements winning regulatory agency approval while providing maximum surge protection.

Because the zero crossing of the AC line is not sufficient to de-ionize the gas tube, one or two metal oxide varistors (rated at 300 VRMS) are required in series with the gas tube to limit AC Follow-On Current.

Samples and complete specifications are available upon request.

Note: The Y08SV-312B is UL 1449 (File No. E96234) and UL 1414 Y2 (File No. E165829) Recognized

Sankosha Corporation Introduction Video 

Sankosha U.S.A., Inc.
For over 75 years, Sankosha has developed and manufactured the Ceramic Gas Tube Surge Arrester (Gas Discharge Tube or GDT). Sankosha gas tube arresters protect personnel, equipment and circuitry from abnormally high voltages caused by lightning or electrical transients. Our surge protection devices have well defined surge-limiting characteristics enabling them to spark over (or breakdown) when the abnormal voltage on a line reaches a specific level. When sparkover occurs in the GDT, the surge is redirected to earth.

Sankosha’s gas tube arrestors are known for their quality. Throughout the world, products from our factories provide protection for equipment and personnel. Sankosha has been selling gas tube arresters in the U.S. since the seventies and Sankosha U.S.A., Inc., the company’s 100% owned subsidiary, was established in 1987 to better service the growing market in the Americas.

Different applications require different surge suppressors and Sankosha provides gas tubes to meet every need. Consumer electronics, modems, satellite, computer, CATV/Broadband, industrial, and telecom circuit protection are just a few areas that utilize our gas discharge tubes. Sankosha’s gas discharge tubes are extremely durable and provide the industry’s best impulse life specifications. They feature high surge ratings with very low capacitance and provide excellent response to fast rising transients.

Sankosha gas discharge tubes are available in axial leaded, radial leaded, surface mount, and special packages. High voltage gas tube models like the Y08SV-312B are designed for power supply applications where HiPot testing is required, and we also manufacture very small gas tube arrester models for surface mount applications where real estate is at a premium. Sankosha’s GDT’s come in both two and three electrode configurations. Discharge voltages from 75V to 6000V are available.

Sankosha’s RJ45 LAN SPD provide reliable surge protection of GigE (1000Base-T), 100Base-TX, 10Base-T and Power Over Ethernet (PoE) equipment. All four compact Local Area Network modules are equipped with RJ45 Connectors and can be used as stand alone surge protection devices. They are also designed with integrated clips for easy installation on a standard 35mm DIN rail.

In the 1970’s, Sankosha developed SAN-EARTH, the original conductive concrete groundbed. SAN-EARTH M5C is a fine powder used to build highly effective environmentally safe permanent grounding electrodes. SAN-EARTH M5C is manufactured in accordance with Sankosha’s ISO 9001 Quality Standards and conforms to IEC Standard 62561-7 which specifies the requirements and tests for earthing enhancing compounds producing low resistance of an earth termination system. Safe, economical and permanent, SAN-EARTH is the best grounding solution for both equipment performance and personnel safety.