1021
This electrical safety device is intended to protect people from electric shock when touched directly and indirectly, and also reduces the consequences of damage to the equipment connected to this installation, and also limits the possibility of fire. On the site https://robelectro.ru you can find any electrical equipment
The principle of operation of the switch of the differential machine
Turns off the protected electric circuit when it is detected when the geometric sum of the currents entering and leaving it is not equal to zero. Then a differential or otherwise flowing current arises. Design of the switch of the differential machine
- contacts of current tracks with a lever that turns on the device;
- the trigger, which is most often a polarized relay;
- Ferranta transformer, through which the phase wires and the neutral wire pass;
- testing scheme for checking the switch.
We can distinguish differential current switches, which are divided into two groups. First, these are devices that are used to monitor the occurrence of leakage current. On the contrary, the second group refers to devices that have the ability to self-restore when the differential current enters the circuits.
How does a circuit breaker work?
The outstanding relay from this group of products is undoubtedly the RGU-2 relay. Ego housing with 2 DIN modules includes an LCD display, a diode strip that visually shows the percentage value of the leakage current. We have the opportunity to program the nominal differential current and operating time.
The RGU-2 and CBS-10 relay is a practically identical solution for RGU-4. Their cases are wider than RGU-2 and have the size of 3 DIN modules. During normal operation, the RGU-10 and CBS-4 relays have an LCD screen highlighted in green, and when the set leakage current threshold is exceeded, it turns red. One and the other have an additional RS-485 Modbus / RTU communication module.
Popular Models
The above relays are class A, the only exception is the RGU-10b relay, which is class B. They all work with WGC type transformers. In addition, RG1M have two independent programmable outputs (main and preliminary alarm).
From the second group of devices, the REC-3 model is a distinctive class A differential switch. It is mounted like an ordinary switch, except that there is no need to make internal connections between its motor drive and part of the differential current. Depending on the model, it is supplied in a 2- or 4-pole version at 30 mA or 300 mA.
