The Difference Between Soft Starters and Inverters

The distinction between soft starters and inverters in the electrical world is a crucial matter for optimizing the performance of electric motors and electrical devices. While both serve as tools for initiating electric motors, there are vital differences in their functionalities and applications that require a detailed examination.

A soft starter operates as a type of gentle and adjustable initiation for electric motors. During the motor start-up moment, this device applies voltage and current smoothly and in a suitable sequence. The use of a soft starter is highly beneficial for reducing the pressures resulting from the rapid launch of electric motors.

On the other hand, an inverter or drive is responsible for altering the frequency and voltage of the input to precisely control the speed and performance of the electric motor. Recognized as an intelligent solution, this device is known for optimizing energy consumption and enhancing the efficiency of electric motors.

Considering the provided explanations, it is evident that soft starters and inverters address various aspects, including mitigating the stress of quick starts and optimizing the efficiency of electric motors. To gain the best understanding of their differences and applications, it is essential to familiarize ourselves with their features and usage. This article, with a focus on the distinctions and applications of these two devices, aids in a deeper comprehension of the subject. For further information, delve into the article.

Introduction to Soft Starter

A fundamental tool in the electrical world, the soft starter, or soft launch, is employed to control and regulate the voltage of motors at the moment of startup. These devices find application in conditions where there is a need for very high startup current or in confined spaces, emphasizing space savings and efficiency. Despite the potential high costs, they have gained significant attention due to their widespread applications and ease of use.

Soft starters have the capability to control the torque and speed of motors during the startup process, recognized as vital tools in this regard. With their compact footprint and the ability to regulate voltage in the initial moments of startup, they are considered an excellent choice for constrained environments requiring precise electrical control of motors.

Inverter or Variable Frequency Drive (VFD)

Variable Frequency Drives (VFDs), also known as Variable Speed Drives (VSDs), are recognized as vital and professional technologies in optimizing the performance of motors in the electrical world. As advanced electronic devices, inverters are responsible for controlling and adjusting the speed of motors during startup and shutdown, a control mechanism based on altering voltage and frequency.

The versatility of inverters in various designs is aimed at maintaining a constant flow of current and pressure, contributing to energy consumption reduction. The operation of inverters at low motor speeds allows you to optimize energy consumption at minimal cost.

The use of inverters provides full speed control capability, leading to a reduction in internal pipe vibrations and oscillations. These features, coupled with dynamic torque and smooth motion, transform these devices into ideal tools for use in escalators and elevators. Moreover, inverters, with their precise speed control ability, are recognized as exceptional tools in industries such as mixers, crushers, and mills.

Examining the Differences Between Soft Starters and Inverters Considering Various Factors

In choosing between soft starters and inverters, attention must be paid to specific needs and intended applications. These two electrical tools, with distinct features, are suitable for controlling motors and electrical devices. To better compare and understand the differences between the two, various factors need to be taken into account.

Speed Control Program:

– If the program requires a sudden surge of current but does not necessitate precise speed control, soft starters are a suitable option.

– If precise motor speed control is needed, it is better to use an inverter or drive.

Performance Differences:

– Soft starters are utilized for motor startups and have a more limited range of applications.

– Inverters are used for changing and controlling motor speeds, initiating motor startups, and altering the motor rotation direction.

Dimensions and Space Requirements:

– Soft starters have smaller dimensions compared to inverters and occupy less space.

– Inverters have larger dimensions and utilize more space.

Price and Cost:

– Due to their advanced capabilities, inverters have a higher price compared to soft starters.

– In general, the price of inverters is usually higher than that of soft starters.

Considering these factors, you can choose between soft starters and inverters based on your specific needs and desired specifications for different applications.

The Difference Between Soft Starters and Inverters

Differences Between Soft Starters and Inverters in Terms of Device Keys

In the electrical world, soft starters and inverters are two devices with different features and applications. One of their key differences relates to the device keys.

Soft starters, equipped with static keys, are used as tools to control current and voltage in high-power applications in a reverse and parallel manner. This prominent feature of soft starters is particularly significant in applications with considerable power.

In contrast, due to more advanced capabilities, inverters are better suited for connecting to motors. This device can be connected to multiple motors, but it is recommended to limit this to achieve optimal performance.

Considering the comparison between soft starters and inverters, one of the fundamental differences lies in their remote control capabilities. Inverters are utilized as advanced tools in the industry, possessing the ability for precise and remote control. This feature makes them an ideal choice for applications requiring accurate remote control.

Conversely, soft starters do not provide this capability and have more limited applications in the industry. These devices are primarily used for motor startups and do not offer remote control features.

Given this fundamental difference, inverters are introduced as an advanced and reliable option, especially for users requiring precise and remote control. On the other hand, soft starters are typically employed in applications with lower demands.

Practical Examples of Soft Starters and Inverters

In practical examples, the use of these two devices in water treatment stands out. For water treatment facilities requiring a constant flow, soft starters are preferred as a reliable and efficient option. In this scenario, the soft starter, with precise control of the current during pump startups, operates optimally. On the other hand, when there is a need for changes in the input and output water demand, as well as pump speed, inverters are introduced as a suitable option.

Therefore, the main difference between soft starters and inverters lies in how they utilize device keys, each catering to specific power and electrical requirements within their domain.

As a final decision, choosing between a soft starter and an inverter depends on the features and requirements of the specific program. For the best comparison of these two tools, attention should be given to various factors discussed below.

In some applications, such as air cooling systems, there is a need for precise control of fan speed. In this case, inverters are highly suitable tools with variable and flexible speed capabilities. These devices, with dynamic speed adjustment, contribute to optimizing energy consumption and environmental cooling. If only the need is to turn the device on or off, soft starters remain a cost-effective and suitable option.


In the conclusion, we provided a detailed comparison of the differences and features between soft starters and inverters. Despite the significant differences, these two devices also share common applications in electrical systems. Typically, inverters are used for motor speed regulation, while soft starters are employed for motor startup and shutdown.

Key differences between these two devices include price, dimensions, and speed control, all of which were discussed in this article. The choice between them depends on your specific needs and applications. Depending on the intended use, you can opt for one or both of these devices.

Credibility and quality are of utmost importance. In ElectraShine, products such as soft starters and inverters come with guaranteed quality and diverse applications. These products, ensured for quality by ElectraShine, are made available to you.

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