Surge protective devices (SPDs) play a critical role in protecting sensitive electronic equipment from unexpected voltage changes, such as voltage surges and spikes. These sudden voltage spikes can cause significant damage to equipment, leading to costly downtime and repair. In this article, we will explore the different components of Surge protective devices (SPDs) and describe their functions.
1. Surge Protective Device Base
The Surge protective device base is the core component of a Surge protective device (SPD). This base is typically composed of a durable and sturdy material, such as plastic or metal, and designed to hold the inner components in place. The base is usually equipped with mounting options that allow it to be secured to a surface or mounted on a DIN rail.
2. Varistor
A varistor, also known as a voltage-dependent resistor, is the primary component that protects the equipment from voltage surges. A varistor changes its resistance based on the voltage it encounters. When a voltage spike occurs, the varistor responds by effectively diverting the excess voltage away from the equipment. As a result, the voltage spike is diverted to ground, preventing any potential damage to the equipment.
3. Inner Mudule Indicator Key
The inner module indicator key is a small mechanical device that provides a visual indication of the status of the Surge protective device (SPD). This indicator key displays the status of the device by changing its color or position relative to the base. A typical indicator key may display green when the Surge protective device (SPD) is functioning correctly, and red when the device has been damaged due to an unexpected voltage surge.
4. Pluggable Lightning Protection Module
A pluggable lightning protection module is an additional component that can be plugged into a Surge protective device (SPD). This module provides an extra level of protection against lightning strikes and other electrical disturbances. The pluggable module contains a series of protective components, such as surge arresters, gas discharge tubes, and transient voltage suppressors.
In conclusion, Surge protective devices (SPDs) play a crucial role in protecting sensitive electronic equipment from unexpected voltage surges and spikes. The components described above work together to provide reliable and robust surge protection. By understanding the basic components of a Surge protective device (SPD), you can make informed choices when selecting surge protection systems for your sensitive electronic equipment.
In an electrical systems, SPDs are usually installed in tap-off configuration (in parallel) between the live conductors and the earth. The operating principle of SPD can be similar to that of a circuit breaker. In normal use (no overvoltage): the SPD is similar to an open circuit breaker. When there is an overvoltage: the SPD […]
Surge Protection Devices (SPD) are used for electric power supply networks, telephone networks, and communication and automatic control buses. The Surge Protection Device (SPD) is a component of the electrical installation protection system. This device is connected in parallel on the power supply circuit of the loads that it has to protect (see Fig.1). It […]
GENERAL INFORMATION l Single-pole/ Two-pole/ Three pole/ Four pole varistor surge protective device (AC SPD) l Visual indication and optional remote contact signaling(S). l The Prewired complete unit consisting of a base part and plug-in protection modules. l Installation at the boundary of zones LPZ1 and LPZ2. l The Modular surge arrester for use in AC or DC PV system. l DIN rail […]
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