RCCB (Residual Current Circuit Breaker) is a protective device that detects residual current (such as leakage current) in a circuit and quickly cuts off the power supply. It is mainly used to prevent electric shock to the human body and fires caused by electric leakage, but does not have overcurrent protection function (needs to be used in conjunction with MCB or RCBO)
The core difference between electromagnetic and electronic RCCB
Working principle
Electromagnetic RCCB: uses a pure mechanical construction based on high magnetic conductivity materials and permanent magnetic steel for motion. Upon a detection of residual current, the tripping mechanism is directly driven by electromagnetic induction to cut off the supply power, without the use of an external supply power
Electronic RCCB: Electronic amplification circuit within, which relies on line voltage for its power. When leakage is detected, the electronic component amplifies the signal and controls the mechanical device to turn off the circuit. In case the line voltage is defective (i.e., a defective neutral wire), the electronic circuit may not work properly
Action energy dependence
Electromagnetic type: not dependent on power supply voltage, it can operate in case of leakage even if the circuit is open.
Electronic: requires a stable power supply voltage support, voltage fluctuation or loss will cause protection function failure
Anti-interference ability
Electromagnetic type: insensitive to voltage fluctuations, surge currents, and other interferences, with higher stability.
Electronic: Electronic components are susceptible to grid harmonics or lightning strikes, and may malfunction or be damaged
Lifespan and Maintenance
Electromagnetic type: The mechanical structure is durable, with a lifespan of over 20000 cycles and low maintenance requirements.
Electronic: The lifespan of electronic components is limited, and sensitivity may decrease after long-term use
Comparison of advantages and disadvantages
| Feature | Electromagnetic RCCB | Electronic RCCB |
|---|---|---|
| Maintainability | High (No electronic components) | Medium (Dependent on circuitstability) |
| Cost | Higher | Lower |
| Application | Industrial, high-demand householdenvironments | Ordinary households, stable voltageenvironments |
| Weak lineprotection | Supported (Effective even if neutral line isdisconnected) | Not supported |
| Surge resistance | Strong | Weak |
How to choose RCCB?
Home users
In case of a high budget and long-term stability, electromagnetic RCCB (especially in old lines or areas with poor voltage reliability) must be at the top of the priority list.
In case of a stable line and an economical solution is required, electronic RCCB can fulfill minimal requirements
Industrial scenario
Electromagnetic type must be used since it works more stably under complex power grid conditions
Special requirements
If phase loss protection is required (such as three-phase equipment), electromagnetic type only can be applied.
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