General
Product type	Surge protection plug
Clamping technology	High-performance varistor
Monitoring	Thermal
Fault reporting	Optic
Operating voltage	230 V AC
Compatibility	VAL-MS base element

The VAL-MS 230 ST surge protection plug from Phoenix Contact is a Type 2 protection module specifically designed for integration into VAL-MS base elements. It provides protection for electrical installations against overvoltages caused by lightning discharges or switching operations in the network. The device is designed for an operating voltage of 230 V AC and features a high-performance varistor as the main component for diverting overvoltages. Thermal monitoring of the varistor ensures safe operation by triggering a response in case of overload or wear of the component. An optical fault indication allows visual inspection of the protection plug’s status, enabling quick detection of a defective condition and replacement of the protection.

Applications

The VAL-MS 230 ST is intended for use in electrical installations within the low-voltage technology sector, particularly in buildings where protection against transient overvoltages is required. It is typically installed in distribution boxes or enclosures, where it connects to the VAL-MS base element. Applications include industrial, commercial, and residential buildings where high availability of electrical supply and protection of connected devices are essential. The Type 2 protection class meets requirements for diverting overvoltages occurring within buildings and is therefore suitable for use in accordance with DIN VDE 0160 and EN 61643-11.

Functions and Equipment in Detail

The protection plug features a high-performance varistor that rapidly and efficiently diverts overvoltages. Thermal monitoring of the varistor ensures that an overload or wear of the component triggers a response to prevent damage to the installation. The optical fault indication, implemented via an LED display, enables visual inspection of the operational status. In case of a fault, the LED lights up, allowing for quick detection and subsequent maintenance. The design for 230 V AC makes the plug suitable for standard supply voltage in Europe.

Technology Explained Simply

A Type 2 surge protection plug protects electrical installations from short-term voltage spikes caused by external influences such as lightning strikes or internal switching operations. The high-performance varistor reacts to voltage increases and safely diverts the excess energy. Thermal monitoring tracks the temperature of the varistor to ensure it is not overloaded. The optical fault indication shows whether the protection is still functional. This combination of diversion, monitoring, and visual control ensures reliable protection.

Compatibility and Accessories

The VAL-MS 230 ST is specifically designed for mounting in VAL-MS base elements and is therefore only usable in combination with these base elements. Available accessories include markings such as the ZBN 18,LGS:ERDE 2749589, the B-STIFT 1051993, or the Zackband ZBN 18,LGS:L1-N,ERDE 2749576, which are used to label terminals and conductors. These markings facilitate installation and maintenance by clearly identifying conductors and functions within the distribution box. The unprinted Zackband ZBN 18:UNBEDRUCKT 2809128 can also be used for custom labeling.

Mounting and Installation

Installation is performed by inserting the VAL-MS 230 ST into the corresponding VAL-MS base element. The device is installed in a distribution box or enclosure, with electrical connections made according to VDE regulations and the specific system design. Connections are made via the designated terminals, which are rated for 230 V AC. The thermal monitoring and optical fault indication require no additional external components, as they are integrated directly into the protection plug.

Advantages in Operation

The VAL-MS 230 ST provides reliable protection against overvoltages, enhanced by its integrated thermal monitoring and optical fault indication. Visual inspection enables quick detection of faults, reducing maintenance intervals and increasing operational safety. Compatibility with VAL-MS base elements ensures modular and flexible installation that can be adapted to the specific requirements of the installation. The use of high-performance varistors ensures efficient diversion of overvoltages, protecting connected devices from damage.