Things to know about low voltage switchgear

Switching devices now play an integral role in the electrical system. They will ensure safety as well as help the system operate safely and reliably. The following article will help you understand more about these switches. Specifically, the low-voltage switch.

Low voltage switchgear, also known as aptomat, automatic air cutter ... These devices are used to disconnect the circuit automatically when problems such as overload, reverse power, low voltage , short circuit…
For modern low voltage switchgear, it has the ability to interrupt currents up to 300Kh, or sometimes it is curved to be used for close, infrequent shutdowns with normal circuit circuits. .
For switching equipment - low voltage LS, depending on each criterion we can classify them in different ways such as:
- Classify them based on structure as 1 pole, 2 pole, 3 pole type.
- Classify them based on duration of impact such as slow impact or rapid impact
Or you can also classify them based on protection tools such as: polar line, max current, reverse power protection, universal aptomat, aptomat shaping, minimum current aptomat, voltage aptomat low.
When using low-voltage switchgear we need to pay attention to the following:
These low-voltage devices must be ensured for long-term operation, with the rated currents flowing through the machine must be stable and durable.
These low-voltage switchgears should also be guaranteed to cut short-circuit currents up to several tens of kilos. Also, for contacts that may be closed or closed, their main contacts still suffer from very large short-circuit currents.
- Even after the system has been switched off, these devices must still be operating at the rated current. In parallel with this, the circuit breaker needs to be able to adjust the duration of the action, and adjust the value of the active current.
- With this device must ensure the short circuit time to avoid the circuit breaker can occur due to short circuit current. At the same time, it can stabilize electrodes and temperature of other electrical devices.