Surge protection for power supplies

Every type 1 lightning current arrester fulfills the high requirements in terms of discharge capacity. At the same time, it is also a type 2 surge protective device (SPD). The fact that a type 1 lightning current arrester satisfies test class II is redundant information and does not constitute an additional qualification. Therefore, such protective devices are called combined lightning current and surge arresters (SPD type 1+2). A combined lightning current and surge arrester is a protective device that fulfills both test classes.

The type 1+2 special combined lightning current and surge arrester differs fundamentally from the type 1+2 version. This is because the type 1+2 special combined lightning current and surge arrester contains two independent protective devices that are connected in parallel in a very small space. The voltage-switching spark gap (SPD type 1+2) works ideally in combination with a voltage-limiting varistor (SPD type 2). In this combination, two autonomous protective devices in one compact block ensure optimum response behavior, optimal system protection, and a long service life for the components.

Type 2 surge protective devices (SPDs) are generally installed in subdistribution stations or machine control cabinets. They form the second protection level in a three-stage surge protection concept. SPDs of type 2 must be able to protect against surge voltages from indirect lightning strikes or switching operations. Overvoltages caused by switching operations are often highly dynamic and occur much more frequently than overvoltages caused by lightning. Technology featuring a fast response behavior – such as varistor technology – has proven itself here.

Type 3 surge protective devices are generally installed immediately upstream of the end devices to be protected. Thus, they are also referred to as “device protection”. Type 3 SPDs are available in a wide range of designs to suit different installation environments:

• Devices for DIN rail mounting
• Devices for insertion in sockets

With the right surge protection, you ensure the availability of your application. Whether for regenerative and thus clean energy generation or for the mobility of the future, the right protection against overvoltages is simply essential. Networked buildings, industrial systems, and the associated infrastructure are the basis for automated value creation.

To keep your equipment and investments available and productive, we provide you with the ideal surge protection products for almost all applications and supply system configurations.