B88069 series - gas arresters for protection of telecommunication and signal circuits

20.10.2023

Pulse interference is a very serious obstacle in the operation of electronic devices, and can also be the cause of their failure, therefore, protection against pulse interference of various nature is one of the key tasks in the creation of user and industrial equipment and devices. One of the most effective means, along with other methods of protection against interference, is the use of gas-filled arresters.

Внешний вид газового разрядника типа A81 серии B88069Appearance of A gas arrester type A81 series B88069

Gas-filled surge limiters operate on the principle of arc discharge. Electrically, overvoltage limiters act as voltage-dependent switches. As soon as the voltage applied to the spark gap exceeds the spark discharge voltage, an electric arc is formed within nanoseconds in the hermetically sealed area of the spark gap. The ability to withstand a large pulse current and arc voltage, which is practically independent of the current, lead to a short circuit during overvoltage. When the discharge stops, the arc goes out, and the internal resistance of the spark gap returns to values of more than 100 mOhm.

Thus, the overvoltage limiter optimally meets the requirements for the protective element: it reliably limits the overvoltage to acceptable values, and under normal operating conditions, high insulation resistance and low capacitance contribute to the fact that the arrester practically has no effect on the protected system.

Together with varistors, PTC thermistors, diodes and inductors, gas arresters provide step protection, creating a reliable solution for many applications. Basic protection schemes using two or three-electrode gas arresters (upper row), or with the addition of PTC thermistors (lower row) are shown in the figure:

Базовые схемы защиты с использованием газовых разрядниковBasic protection schemes using gas arresters

The key characteristics of the arresters are: constant breakdown voltage (DC), pulse discharge current (8/20 µs), discharge current for alternating voltage (50Hz). The features of gas–filled arresters in the B88069 series are the number of electrodes (2 or 3), overall dimensions by type in the series, low capacitance and high insulation resistance.

In our assortment in the B88069 series, the types of arresters received the greatest demand:
A71 – for medium loads, designed for connecting overhead and underground cables and protecting subscriber equipment;
A81 – for heavy loads, designed for overhead lines and equipment particularly sensitive to lightning strikes, protection of subscriber equipment in unprotected places;
M51 – for small loads, designed to protect user equipment (WLAN routers, TV receivers, cable modems, wireless communication modules) and others.

Reliable voltage limitation, high discharge current load capacity, low intrinsic capacitance and high insulation resistance of the B88069 series gas arresters provide optimal protection against overvoltages caused by lightning, electrostatic or electromagnetic discharges.

In more detail, the technical characteristics of the arresters of the B88069 series are presented in the Specifications for the series on the product page.