Residual Current Protection Relays of Acrel and Their Application Scenarios

ACREL Residual Current Protection Relay Product Models

ACREL Residual Current Protection Relay Products include ASJ10 series rail type residual current operated relay, ASJ10L LCD residual current operated relay, ASJ20 series panel type residual current operated relay, AIM-R100 panel type residual current operated relay, and ASJ60 series residual current monitoring products.

Functions of ACREL Residual Current Protection Relay Product

Residual Current Protection Relay for the protection against direct contact electric shocks

In the protection against direct contact electric shocks, the Residual Current Protection Relay (RCD) only serves as a supplementary protective measure for basic protection against direct contact electric shocks (excluding protection against direct contact electric shocks formed between phase and phase, phase and N wire). When used for protection against direct contact electric shocks, an RCD with no time delay and a rated operating current not exceeding 30mA should be selected.

Residual Current Protection Relay for the protection against indirect contact electric shocks

The main measure for the protection against indirect contact electric shocks is the use of automatic power cut-off protection method. This is to prevent the harmful impact caused by the continuous dangerous voltage on the exposed accessible conductors of electrical equipment due to an earth fault when the insulation of the electrical equipment is damaged, or the occurrence of electrical equipment damage accidents. When a circuit occurs with insulation damage causing an earth fault, and the earth fault current value is less than the operating current value of the overcurrent protection device, an RCD should be installed.

Summary: Residual Current Protection Relay can greatly reduce electrical accidents and ensure the safety of people's lives and property.

(Direct contact electric shock: Direct contact electric shock is the shock received by touching the live parts of equipment and lines during normal operation(such as the shock caused by accidentally touching a terminal), also known as the shock in normal state.

Indirect contact electric shock: Indirect contact electric shock is the shock received by touching the conductors that are not live in normal state but become live accidentally when the equipment or lines fail(such as the shock caused by touching the casing of leaking equipment), also known as the shock in fault state. The human body will bear less than the normal working voltage, such as human body voltage < phase voltage 220V, when touching live casings, etc. The risk is also relatively high.)

Application Scenarios of Residual Current Protection Relay

Residual Current Protection Relay for terminal protection

• Class I mobile electrical equipment and handheld power tools;

• Electrical equipment used in industrial production;

• Electrical mechanical equipment at construction sites;

• Electrical equipment installed outdoors;

• Temporary electrical equipment;

• Electrical outlets or outlet circuits in agencies, schools, hotels, restaurants, enterprises, and residences, except for wall-mounted air conditioner power outlets;

• Electrical equipment for swimming pools, fountains, bathrooms, and tubs;

• Power supply lines and equipment installed in water;

• Medical electrical equipment that may directly contact the human body in hospitals;

• Electrical equipment for agricultural production;

• Electrical equipment for aquatic product processing;

• Other places where RCD needs to be installed.

Residual Current Protection Relay for line protection

For low-voltage distribution lines, according to the specific situation, secondary or tertiary protection can be adopted. An RCD should be installed at the power source end, the head end of the load group, or the terminal end of the line (power distribution box of agricultural production equipment).