2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:41
Thanks to the active development of new technologies, a special type of switches has appeared - a differential circuit breaker. This attribute better protects against electric shock. In the event of a phase-to-phase short circuit or a ground fault, the machine operates almost instantly, which is why it is often used in hospitals to power highly sensitive devices.
Structurally, the device is made of two components: a differential protection module, made on an electronic basis, and the switch itself.
Today ABB circuit breakers are quite popular. The quality of their production allows you to be sure of the reliability and reliability of the device.
The electronic module of the machine includes a current transformer, with the help of which the differential of the value change is calculated. The transformer works in conjunction with an amplifier that serves to accuratelyjump detection. The switch is installed on a special DIN rail using a plastic latch. Thus, the machine is easy to maintain and very easy to replace.
ABB - new generation circuit breakers, their operation is based on the comparison of incoming currents with outgoing currents. When the machine is turned on, the electronic module is energized, while the connected load creates a working current. With the help of a transformer, the direction of the currents and their magnitude are determined. In normal mode, the vectors are directed oppositely, and their algebraic sum is equal to zero.
If the differential circuit breaker closes to ground, then along with the load current, a leakage current occurs in the circuit - this is the difference between the input and output values. As soon as the leakage current exceeds the setting threshold, the secondary winding of the current transformer sends a signal to the trip coil of the machine.
Using the "Return" button, you can check the differential circuit breaker and try to turn it on again. In order to monitor the performance of the machine, it has an electronic circuit for testing the device. There is a test button on the front panel. With its help, it is possible to artificially create a tripping leakage current. If the machine worked quickly and without jamming, then it is normal and ready for further operation.
The main advantages that a differential circuit breaker has is, of course, speedtriggering. In addition, such machines allow you to protect the circuits in three ways:
- protection against overload current circuits;
- protection against phase-to-phase short circuit;
- Earth fault protection.
Manufacturers offer different types of differential machines. The total number of types and models exceeds 40 units, while each operation is accompanied by a special indication announcing an accident.
The minimum service life of such switches is 15 years or more. Other advantages of the device include an improved design of the control module, a fairly wide temperature range at which the machine can work flawlessly: from -25°C to +40°C. Thus, difautomatic devices are excellent devices for combined protection of equipment, but they are not recommended for use in everyday life, as they are quite sensitive: problems with frequent shutdowns may arise. Even a small leak when heating an electric kettle is enough for differential machines, which happens quite often.
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