John’s protective keys:

 John’s protective key is one of the types of electrical protection keys that is used in an electrical system to protect persons and equipment. John’s protective key, which is provided in several different types

One of the safest protection keys for detecting and disconnecting power leakage and also preventing shock caused by indirect contact with electricity.

How life saver keys work:

The way this key works is that by comparing the difference between the flow of the went and the return current, if there is a difference between the flow, it goes and cuts off the return current of the circuit.

In simpler language, this key

Measures the inflow to the device and the output current from it. Normally, the amount of flow went is equal to the return flow. But if there’s a disagreement, this difference can be due to

The connection between each of the phase wires or electrical parts of the circuit is with the fuselage, which is called a current leakage. In case of flow leakage, the life-protecting key detects this leakage and circuit

disconnects. This amount of small leakage currents is not detected by the miniature key, causing fires in the building or causing electrocution for the user. John’s protective keys in the face

The leakage current occurs in a fraction of a second and acts quickly and cuts off the circuit.

The life guard key is also called the differential flow key, the residual flow key, and the differential flow key.

Types of life-protective keys:

RCCB keys:

RCCB stands for Residual Current Circuit Breaker, which means lexical leakage switches, RCDs that do not have overload protection. Their task is only to protect against flow


RCBO keys:

RCBO stands for Residual Current Circuit Breaker With Over Protection, meaning lexical leakage switches with overload protection. These keys are in addition to leakage current protection

Their main task is to protect against overload flow. The word RCBO is more prevalent in Europe.

Another name for the RCBO key, which is common in the United States and Canada, is GFCI, the term Ground Fault Circuit Interrupter. The RCBO key is also called the Combined John’s Protective Key.

Requirements for the use of john protective keys:

Today, according to building safety standards, the existence of life-protecting key in all circuits is mandatory.

There are four areas in the building where the lifeguard key or RCD is mandatory. These areas include:

Inlet switchgear: The presence of a life-protecting key protects the switchgear from dangers such as short circuit fires and overloads.

Switches and sockets: All switches and sockets in the system must be equipped with a life protection key for risks such as user electrocution.

Bathrooms and all wet areas: So that all switches and sockets of the toilet must be protected by leakage keys. Because in moisturized environments, when the skin

The body is wet, the body is extremely sensitive to electrical current.

Terms of use of life-protecting keys:

1- John protective keys are available with the power to cut short circuits of 6 kA and 10 kA under working temperatures from -35 to +70 °C.

2- RCCB keys do not have short circuit protection and overload, so miniature switches are used before RCCB’s in orbit.

3- John’s protective keys are made in amps from 6 to 100 amps.

4- In construction units or single-phase applications, John Dopel’s protective key is used and in industrial units or three-phase applications, 4-bridge life protection keys are used.

5- The sensitivity or automatic disconnection of life-protective keys is from 10 to 500 mAh with a cut-off time of up to 150 mm.

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