What is a differential circuit breaker?
Thanks to the active development of new technologiesa special kind of commutators appeared - a differential automatic switch. This attribute is better protected from electric shock. When there is a short phase-to-phase fault or a short to ground, the automaton operates almost instantly, so it is often used in hospitals to supply high-sensitivity devices.
Structurally, the device is made of two components: a differential protection module, made on an electronic base, and the switch itself.
Today, automatic switches ABB are quite popular. The quality of their production allows you to be confident in the reliability and reliability of the device.
The electronic module of the machine includesa current transformer, by means of which the differential of the value change is calculated. The transformer works in conjunction with an amplifier, which serves to accurately determine the jump.
Installation of the switch is made on a special DIN-rail with a plastic latch. Thus, the machine is easy to maintain and very simple to replace.
ABB - automatic circuit breakers of the newgeneration, their work is based on a comparison of the currents of the incoming currents. When the machine is switched on, the electronic module is under power, while the connected load creates working current. With the help of the transformer, the direction of the currents and their magnitude are determined. In the normal mode, the vectors are reversed, and their algebraic sum is zero.
With the help of the button "Return" it is possible to confirmDifferential circuit breaker and try to re-enable. In order to monitor the operability of the machine, it has an electronic circuit for testing the device. On the front panel there is a button "Test". With its help, it is possible to artificially create a disconnecting leakage current. If the machine has worked quickly and without jamming, then it is normal and ready for further use.
The main advantages of a differential circuit breaker are, of course, the speed of operation. In addition, these machines can protect the circuit in three ways:
- protection against overload current circuits;
- interfacial short-circuit protection;
- earth fault protection.
Manufacturers offer different typesdifferential automata. The total number of types and models exceeds 40 units, with each operation being accompanied by a special indication informing about the accident.
Minimum service life of such switches from 15years and above. Other advantages of the device include an improved design of the control module, a fairly wide range of temperatures at which the machine can operate reliably: -25 ° C to + 40 ° C. Thus, the diaautomatics are excellent devices for combined protection of equipment, but are not recommended for use in everyday life, as they are quite sensitive: there may be problems with frequent trips. Differential automatons are sufficient even for a small leak when heating an electric kettle, which happens quite often.
