What is Open frame linear and other types of solenoids
Dec 03 , 2021

At the performance of mini size, push pull type, Open Frame Solenoid are most-effective , widely used for various machine.

First, let we know about the difference between open frame linear DC solenoids and other types of solenoids.

Linear solenoids are an intricate part of our daily lives. They are used in locks, cars, vending machines, and most of the equipment and appliances we use every day.

There are several types of linear solenoids on the market, including tubular solenoids, latch solenoids, and open frame linear solenoids.

Each is designed to better meet the needs and functions of different applications.

The open frame varieties are the least understood in this group and in most cases are confused with tubular solenoids, and they are a very different product type.

Let's take a closer look at open frame linear DC solenoids, their components, how they work, and how to achieve their benefits.

What is Open frame linear and other types of solenoids?

Among the different types of linear solenoids, the open frame solenoid has the simplest design. They are defined as solenoids with mechanically unprotected, visible, overmolded or tape coils with a movable plunger in the center of the coil.

Due to its unique construction, the open frame is lighter and more cost-effective than other types of linear solenoids.

Like most other linear solenoids, the open frame generates force in a single direction, which can be pulling or pushing when energized.

What is the difference between an open frame linear electromagnet and a tubular electromagnet?

It is best to compare solenoids based on the key characteristics that should be considered when selecting solenoids. This requires a clear understanding of the differences between the three types of solenoids.


One of the differences is structure. Only the tubular solenoid adopts a closed design, and the coil is safely hidden in a metal casing. The coils of the open frame are exposed at least on both sides. The magnetic latch solenoid can adopt a tubular or open frame design.

The general shapes of the latch frame and the open frame are usually the same. Among the changes within these solenoid categories, the shapes and sizes between the two may be slightly different.


All tubular, open frame and magnetic latch solenoids have push-pull styles. In the tubular and open frame, the center plunger can move without current, and has a flexible duty cycle, which can be continuous or intermittent according to the requirements of the application. In a latch solenoid, the plunger is held in place by a permanent magnet, and there is no chance of continuous circulation.

Stroke and retention

The latch and open frame solenoids have very similar statistics in terms of retention force and stroke length. However, unlike the open frame, the magnetic latch solenoid does not require current in the terminal position.

Life expectancy

Open frame solenoids are usually based on 500,000 to 100,000 cycles, while tubular varieties are more durable, with an expected life span of more than 25 million cycles.

The above comparison aims to highlight the differences in how to optimize various options for best performance in a given operating environment and application.

Application of open linear electromagnet

Open frame solenoids have a wide range of applications in different industries. Some of the most common applications include:

  • vending machine
  • Residential and commercial locks
  • Card key lock (smart lock)
  • ATM machine
  • Battery powered lock
  • Cash drawer
  • Medical supplies cabinet
  • Game console

Matching the correct components to the correct application is essential to ensure optimal performance and operation.

Leave A Message
If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.