SR4D4018

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Power relays are an important class of electronic components which are commonly used in numerous electrical systems for the purpose of switching and controlling electric loads. SR4D4018 is an example of a power relay series designed by Schneider Electric. It is a 4-pole DC-operated power relay which comes with a wide range of coil voltages, contact configurations, and current ratings. This article will first provide an overview of the application field and working principle of the SR4D4018 relay. It will then discuss the various features and specifications of this relay series.

Application Field and Working Principle

The SR4D4018 series of power relays are designed for use in building automation systems and industrial motor control applications. The SR4D4018 relays can be used to control various electric loads such as motors, pumps, lighting systems, HVAC units, and other electrical components. They are ideal for applications where there is a need for reliable switching and accurate control of electric loads.

In terms of working principle, the SR4D4018 relay is designed with a four-pole arrangement. Each pole consists of a power contact which is capable of controlling a specific electrical load. The power contact is connected to the coil which is responsible for energizing the relay. A DC stationary source is then used to provide the voltage which is needed to energize the coil and trigger the relay. When the coil is energized, the contact points will then move, causing the electrical loads to be switched on or off.

The SR4D4018 is designed with a plastic cover which provides protection from environmental factors such as dust and moisture. The contacts and coils are also sealed to ensure reliable operation in a variety of harsh environments. Moreover, the contact configuration and current ratings of the SR4D4018 can be customized as per the application requirements.

Features and Specifications

The SR4D4018 power relay series has various features and specifications which can be customized according to the application requirements. It is designed with 4 independent power contacts, each capable of controlling a specific electric load. The 4 contacts are designed with a rating of up to 2A and a voltage rating of up to 250V. The contact configuration of the SR4D4018 is available in 1C, 2C, or 3C configurations, depending on the application requirements.

The SR4D4018 series is designed with a wide range of coil voltages, from 4.5 to 60V DC. The coil resistance and inductance are designed to be as low as possible so as to ensure reliable performance in switching applications. The coil is also designed with surge protection to protect against transient voltages. The SR4D4018 is rated for an ambient temperature range of -25°C to +85°C and can be used in environments with high humidity and temperature fluctuations.

The SR4D4018 series is designed with a number of safety and environmental protection features. It meets the applicable standards such as UL 508, IEC/EN 61810-1, and CE Marking. It is also UL Recognized and TUV Certified.

In conclusion, the SR4D4018 series of power relays has been designed for use in industrial motor control and building automation systems. It is versatile and customizable, capable of controlling up to four electrical loads with a current rating of up to 2A. The contacts, coils, and contacts are also designed with numerous safety and environmental protection features. Furthermore, the SR4D4018 series is rated for an ambient temperature range of -25°C to +85°C and comes with a wide range of coil voltage options.

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