Ceramic Arresters

The Ceramic Gas Tube Arresters manufactured by Sankosha Corporation provide protection for personnel, equipment and circuitry from the abnormally high transient voltages which can surge limiting characteristics. When the abnormal voltage on a line reaches that defined level, sparkover (or breakdown) occurs within the gas tube arrested, the surge is redirected and people and equipment are protected.

Sankosha's Ceramic Arresters are very durable and extremely gastight. They have precise sparkover voltages and very high AC current withstand capability and impulse withstand capability. Different applications require different types of arresters and Sankosha provides arresters to meet every need. Arrester models vary both in dimension and in electrical characteristics and it is important that arresters be selected in accordance with the requirements of the particular application. While two electrodes arresters have the advantage of being lower priced, the opening iin the center electrode of the three electrode arrester allows the two gaps of the arrester to share a common gas chamber. This causes sparkover to occur almost simultaneously in both side of the arrester and minimizes the current surge in the protected lines.

The various standard design that Sankosha currently produces are described in the PDF Files that follows. Arresters for special application are also available and we welcome your inquiries if the model you need is not listed.

Unless otherwise specified, the terms used throughout this catalogue are defined as follows.

DC Sparkover Voltage:	With a rate of rise of 100?/s or less, the minimum rising DC voltage that will cause sparkover or breakdown when applied across the terminals of an arrester.
Insulation Resistance:	The maximum voltage attained by an impulse of designated waveform(100 V/µs or 1 kV/µs) applied across the terminals of an arrester prior to the flow of discharge current.
Insulation Resistance:	The resistance measured between the terminals of an arrester when the DC coltage specified in thes catalogue is applied at a nominal ambient temperature (25°C) and relative humidity (75%)
Capacitance:	The capacitance as measured between the terminals of an arrester.
DC Holdover Voltage:	The maximum DC Voltage across the terminals of an arrester under which it may be expected to clear and return ti its high impedance state after the passage of a surge under specified circuit condition.
Impulse Life:	The minimum number of impulse of a specified waveform and peak current which an arrester will conduct without suffering any of the failure modes as defined in this catalogue.
Impulse Discharge Current:	The maximum current of a waveform of 8/20µs that can be applied across the terminals of an arrester without causing the arrester to fail as defined by the failure modes describes below.
AC Discharge Current:	The RMS current value that an arrester will conduct without suffering ane of the failure modes defined in this catalogue when a current of 50Hz or 60Hz is applied for a period of 9 cycles (50Hz) or 11 cycles (60Hz).
Failure Judgment:	After the Impulse Life Test, Impulse Discharge Current Test and the AC Discharge Current Test, and arrester shall be judged to have failed if any of the following failure mode exist.
	Low DC Sparkover Voltage:	Less than 50% of the nominal DC Sparkover Voltage
	High DC Sparkover Voltage:	More than 150% of the nominal Sparkover Voltage
	High Impulse Sparkover Voltage:	More than 150% of the nominal 100V/µs Impulse Sparkover Voltage
	Insulation Resistance:	Less thab one Megohm

The scope of the Sankosha's sampling inspections and the maximum admissible number of defects are based on the specifications of MIL-STD-105E, single sampling plan for normal inspection General Inspection Level II. The AQL at delivery is 0.65 for the DC Sparkover and Insulation Resistance of Sankosha's arresters.

IBS Electronics, Inc.

3506-D, Lake Center Dr., Santa Ana, CA 92704, U.S.A.
714-751-6633 800-717-6475
FAX 714-751-8159

e-mail

Two Electrode	Three Electrode	Miniature
Y08U & Y08UZ Series	3YVJ Series	Y06S & 3Y06 Series
Y08JS Series	3YVP Series
Y08 Series	3YW Series


		Ceramic Arresters
		Radioactive Material Free