How to know which RCCB should I install?

Identifying needs

You need to know what type of RCCB Residual Current Circuit Breaker you should use in a home or ship. Determining the amperage of the general switch is essential, as well as knowing which would be the most optimal so that all components can be protected. Stay in this post so you can know some important information.

Everything will depend on the use you are going to give it, as well as knowing if it is monophasic or triphasic . If it is monophasic, 40A / 30ma circuit breakers are mostly used. However, if they are triphasic, they are usually used 40A / 300ma.

Next we will see a comparison between the best single-phase RCCB Residual Current Circuit Breaker on the market so you can weigh your purchase decision.

Diferencial Monofásico
Interruptor diferencial 25A 30mA curva AC
MÁSS CONFIABLE
Schneider Electric A9R60240 Interruptor Diferencial, 2P, 40A, 30mA, Clase AC
MÁS VENDIDO
BOGAS ELECTRONICS Interruptor Diferencial SuperInmunizado SI, 30 mA, 2P, Clase A y 6kA (40 Amperios)
MÁS BARATO
ABB - Interruptor automático (25 a F202A-25/0,03) Blanco y Rojo
CABLEPELADO Interruptor diferencial residencial 2P-30mA | Poder de corte: 6000A | Clase AC-6kA - PIA - ID eléctrico - salvavidas - automático - magnetotérmico - disyuntor | 25A
DESCRIPCION
Interruptor diferencial 25A 30mA curva AC
Schneider Electric A9R60240 Interruptor Diferencial, 2P, 40A, 30mA, Clase AC
BOGAS ELECTRONICS Interruptor Diferencial SuperInmunizado SI, 30 mA, 2P, Clase A y 6kA (40 Amperios)
ABB - Interruptor automático (25 a F202A-25/0,03) Blanco y Rojo
CABLEPELADO Interruptor diferencial residencial 2P-30mA | Poder de corte: 6000A | Clase AC-6kA - PIA - ID eléctrico - salvavidas - automático - magnetotérmico - disyuntor | 25A
VALORACION
-
-
-
-
OPINIONES
-
-
-
-
Diferencial Monofásico
Interruptor diferencial 25A 30mA curva AC
MARCA
DESCRIPCION
Interruptor diferencial 25A 30mA curva AC
VALORACION
-
OPINIONES
-
PRECIO
MÁSS CONFIABLE
Diferencial Monofásico
Schneider Electric A9R60240 Interruptor Diferencial, 2P, 40A, 30mA, Clase AC
MARCA
DESCRIPCION
Schneider Electric A9R60240 Interruptor Diferencial, 2P, 40A, 30mA, Clase AC
VALORACION
-
OPINIONES
-
PRECIO
MÁS VENDIDO
Diferencial Monofásico
BOGAS ELECTRONICS Interruptor Diferencial SuperInmunizado SI, 30 mA, 2P, Clase A y 6kA (40 Amperios)
MARCA
DESCRIPCION
BOGAS ELECTRONICS Interruptor Diferencial SuperInmunizado SI, 30 mA, 2P, Clase A y 6kA (40 Amperios)
VALORACION
-
OPINIONES
-
PRECIO
MÁS BARATO
Diferencial Monofásico
ABB - Interruptor automático (25 a F202A-25/0,03) Blanco y Rojo
MARCA
DESCRIPCION
ABB - Interruptor automático (25 a F202A-25/0,03) Blanco y Rojo
VALORACION
-
OPINIONES
-
PRECIO
Diferencial Monofásico
CABLEPELADO Interruptor diferencial residencial 2P-30mA | Poder de corte: 6000A | Clase AC-6kA - PIA - ID eléctrico - salvavidas - automático - magnetotérmico - disyuntor | 25A
MARCA
DESCRIPCION
CABLEPELADO Interruptor diferencial residencial 2P-30mA | Poder de corte: 6000A | Clase AC-6kA - PIA - ID eléctrico - salvavidas - automático - magnetotérmico - disyuntor | 25A
VALORACION
OPINIONES
PRECIO

COMPARISON OF 40A 30mA RCCB Residual Current Circuit Breaker

With all this, the protection you want to give it also influences, according to the possibilities of direct contacts that are foreseen. For example, it is not the same that ballasts are going to be fed on the roof of a ship, that they are going to be connected to household outlets.

Another aspect to consider regarding the ICP is that it will depend on where they are going to go, whether it will be in a home or in a warehouse.

There are places where the regulations do not allow more than 15 consumption outlets in a circuit, so when we make the plan, the entire installation must be divided every 15 or fewer outlets, better less than 15 in case you ever decide to add more outlets in that circuit. To each circuit we will assign a different thermal, the thermal that we will assign depends on the consumption of the circuit, there are special cases where a single appliance will have a very high consumption, an air conditioning or micro waves for example, in this case we will place an exclusive thermal for the same, the outlet must also be of power.

Power Calculation

To see an example of how the power calculation is done to choose the thermals that we will place in a house, we will make a practical example.

According to the plan we will make a power table counting the mouths and the intakes. The mouths will be 100 watts and we will add the 200 watts sockets, and to get the intensity we will do the following formula:

I = P / E * cos phi

Cosine of phi is a constant that has the value 0.9

We will multiply the intensity value by the simultaneity coefficient to obtain as a final result the intensity that the circuit will eventually consume.

Circuit I
1100 W / 220 V * 0.9 = 5.55 A

5.55 A * 0.8 = 4.4

La térmica mas próxima a este valor es la de 5 A

Cuadro de potencia

Circuito Bocas Toma Potencia total Cos de phi Intensidadtotal Coeficiente de simultaneidad Térmica
I 6 4 1400 W 0.9 5.55 0.8 5 A
II 2 5 1200 W 0.9 6.06 0.6 5 A

As the thermals are sold with fixed values, it is necessary to look for a thermic close to the value of intensity consumed that the formula gives us.

Total I * C.S. = I of the thermal

The thermals can be obtained from the following intensity capacities:

5A or 6 A, 10 A, 15 or 16 A, 20 A, 25 A, 32 A, 40 A, 50 A, 63 A, 80 A, 100 A.

The smallest circuit breaker is the 25 A, from there they continue with the same values as the thermal ones.

In this Comparative Table we will put some of the single-phase circuit breakers so that you can compare some technical details and you can buy the one that best suits your needs.

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How to place the RCCB Residual Current Circuit Breaker and thermal switches

Finally we will see how the thermals and the circuit breaker are connected, although the connection is easy, it was necessary to know how to choose the appropriate thermal for your house or for any electrical circuit.

The ID that we will use will be 25A, it is a lot for this small installation, but it is the smallest circuit breaker.

The line cable must also be suitable for the consumption of the installation, the higher the intensity, the greater the section of the cable that we will use in this part of the circuit. It is calculated that they are 5 amps per millimeter of cable section, if we do not choose the cable correctly, it may be possible that at a time of overload due to high consumption devices, the cable will heat up to melt and damage the entire installation. Sometimes the thermals can protect the cable from overloads, but I have seen in some repairs that I have made, that before acting the thermal melts the cable little by little, this could also cause fires.

In this case the cable that we will use will be 4 mm to prevent future expansion, with a 2.5 mm cable it would be enough according to the calculation that I mentioned above, we will use this cable measurement until we leave the two thermals, after the two thermals it will be enough to continue with a 2.5 cable.

Surely there are many things that I am forgetting regarding these two components, so I ask that if you have any questions, please do so through the comments.

It is worth clarifying that this note is written as a memory aid for installers or electricians, also only to inform electricity to people without knowledge. No person without experience or knowledge should do this type of work on your own. If the latter is your case, I recommend that you leave this job to a professional.

Install in Industrial warehouse

In case of an industrial warehouse and being single-phase, then it must be 40A,

COMPARISON OF 40A 300mA RCCB Residual Current Circuit Breaker

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In case it is triphasic, then you should use a 16A.

Calculating the amperage for the RCCB Residual Current Circuit Breaker to use

You can use the calculation to know exactly which RCCB Residual Current Circuit Breaker to use in your circuit, depending clearly, as we have said previously, if it is in a home or in a ship:

To make the exact calculation you must know the simultaneity coefficient applicable to the case in question, but as we have said, it is the most approximate and what is used as a general rule.

Calculation of power demand Max. simultaneous

You can calculate the simultaneous maximum power demand (DPMS)
Power assigned to each circuit, affected by simultaneity factors.
For single-phase installations
P= Uf x I
For three-phase installations
P = √3 x UL x I
Being:
P: apparent power (VA)
Uf: phase voltage (Volt)
UL: line voltage (Volt)
I: intensity (Amp)
We consider for small electrical installations (approximately = Cos Ф = 1)

Hypothetical case of an installation

If you had to power an electrical box with a new one, and you have to power lighting circuits, with a maximum consumption of 450W, in this case you do not need ICP (power control switch), because it is already given from the primary panel.
On the other hand, if they are only for lighting and with consumption of 450W, you do not need to put PIA (small automatic switch) of 16A, it is enough for them to be 10A.

Delete the circuit

You can also eliminate a circuit and join it with another lighting, counting that between the two they do not consume more than 10A, that way, you save a differential.

As for the general switch, it will depend on the total consumption and the simultaneity factor, but if they consume 450W each line at most, the sum of all at once is 12th, so with a 16A general switch it is sufficient and suitable for those powers and you also save.

It is important to remember that the protection of each cable is calculated by its maximum energy transport capacity, thus, a 10A Pia can only protect cables of 1.5m / m2:
• De 16A de 2,5 m/m2.
• Si es de 20A de 4 m/m2.
• Si es de 25A de 6 m/m2.

If you ignore these parameters, then the Pías may not act, since they are magnetothermic, that is, they act due to the heat given off by an excessively charged conductor and can be dangerous for the installation.

If a 16A pia is installed with a 1.5m / m2 cable, it is of no use since the breaking power of the Pia is greater than the critical load limit of the conductor. The result would be the melting of the cable, the fire of the receiver, or being left with half a burned installation in the best case.

In the opposite case, Pia of 10 and 2.5m / m2 cable, the result is excess consumption due to the increase in resistance unnecessarily.

Última actualización el 2024-02-07 / Enlaces de afiliados / Imágenes de la API para Afiliados