Do you know these advantages of solid-state device circuit breakers?

11 Dec,2023

In industrial control applications, it is usually provided by DC switching power supplies, and solid-state device circuit breakers are the ideal solution for selective protection of system components in the DC field. It features selective tripping to provide optimal overload or short-circuit protection for a wide range of loads, and non-faulty circuits are not affected by normal operation, thus ensuring downtime in the production process.

The importance of secondary side fuse protection

On the secondary side, the switched-regulated power supply supplies supply DC voltages to the control loop loads such as controllers, operator panels, displays, and auxiliary relays. Wiring protection is required for the control circuitry and, if the load itself is not protected, for the load equipment. At the same time, the Machinery Directive EN 60204 also requires that dangerous ground faults in control circuits be detected and cut off within five seconds.
When the output is overloaded, the overcurrent protection device on the primary side of the switching regulated power supply can react quickly. However, if the power supply is not capable of providing short-term overcurrents, selective protection of the circuits in the secondary circuit by blowing the fuse or conventional circuit breaker is often not possible.

 

There are several types of fuse protection

Temperature type

For example, NH type and DP type fuses require high overcurrent for quick tripping

Example: 10 times overcurrent (refer to fuse rating): trip within 30 ms (best case) or 200 ms (worst case).

Only 2 times the overcurrent: trip in 2 s (best case) or > 100 s (worst case).

 

Thermomagnetic

Commonly found in circuit breakers or motor protection switches, where high overcurrents are required for quick tripping

Example: 3 ... in type B characteristic curve, AC operation 5 times the overcurrent, multiplied by a safety factor of 1.2 or 1.5, so that, in the worst case, the trip current is 7.5 times the rated current

 

Electronic solid-state

Make sure you set it up precisely

Trips quickly even at low overcurrent

Protection is provided even when the cable is long and the conductor cross-section is small

Even at low overload currents and long cable lengths, the ECB ensures reliable protection

 

How Solid State Device Circuit Breakers Work

A solid-state device circuit breaker checks if the output current exceeds the rated current. As soon as the output current is higher than the rated current, the semiconductor switch electronically cuts off the output. The tripping time depends on the magnitude of the overcurrent. The measurement of the output current, the processing and calculation of the trip time, and the triggering of the semiconductor switch are all carried out by a microprocessor. At the same time, the processor can monitor one or more output channels. The corresponding trip time can be referred to the figure on the right.

 

Advantages of Solid State Device Circuit Breakers:

Solid state device circuit breakers actually have more flexible and rich trip curves to match the different load characteristics of customers. At the same time, the optimization of power quality and energy consumption is becoming more and more important today, low-voltage systems put forward higher requirements for ordinary circuit breakers, solid-state equipment circuit breakers can provide the most basic protection functions, but also add a series of convenient functions such as analysis, measurement and communication, it can be seen that as a more intelligent circuit breaker, solid-state equipment circuit breakers can help you optimize and protect your system to the greatest extent:

• Protection system from overload, short circuit.

• Improve power reliability and optimize circuit distribution

•Abundant tripping curves to fit devices with different sensitivities

• Unaffected by the length of the front-end line of the load, it trips accurately

 

Kingsi KSiSA1 multi-channel solid-state device circuit breaker

"Precise load protection function"

It provides reliable overload protection and short-circuit protection, and automatically trips within a set time if the corresponding overload current is reached or exceeded. The trip current and delay time can be flexibly adjusted to better suit different application scenarios.

 

"Support access for multiple load types"

The ability to start loads of 80mF without the need to set a higher current rating eliminates the risk of impacting production due to equipment not starting.

 

"Multi-channel adjustable".

Four- and eight-channel products with adjustable current ratings from 1 to 10A for the flexibility required for a wide range of applications;

 

"Smaller size".

Compact shape design, thickness of only 41mm, high channel density, can save more than 85% of cabinet space;

 

"Easy to install and visualize".

The in-line wiring method is adopted, and the wiring can be installed without tools, saving labor costs; Each channel comes with a built-in LED indicator to display the working status of the circuit in real time;

 

"Abundant alarms and controls".

Early warning, input side overvoltage and undervoltage warning, output side overcurrent warning, remote group alarm, remote reset and control;

 

"Active Current Limit".

Optimized pre-power supply capacity to enable the use of small switching power supplies and prevent accidental voltage drops;