RCD & RCDD
Residual current devices (RCDs) – that usually cut off the power supply in case of detecting an imbalance of the electrical current flow, thus providing protection against electrocution and electrical fires. It is one of the widely used measures to protect people and equipment against leakage current. Typical RCDs used in industries and household application are listed as follows:
(from Wikipedia, please contact us if any issues)
(from Online-information, please contact us if any issues)
RCD Type | Fault current detected | Typical types of load |
Type AC |
- Sinusoidal AC residual current |
Resistive, capacitive, inductive loads. Immersion heater, oven/hob with resistive heating elements, electric shower, tungsten/halogen lighting, etc |
Type A |
- Sinusoidal AC residual current - Pulsating DC residual current |
Single-phase with electronic components Single phase inverters, class 1 IT & multimedia equipment, power supplies for class 2 equipment, appliances such as washing machines, lighting controls, induction hobs etc.
* Type A is also suitable for Type AC applications. |
Type F |
- Sinusoidal AC residual current - Pulsating DC residual current |
Frequency controlled single-phase equipment/appliances Appliances such as a washing machine that is frequency controlled, some class 1 power tools, some air conditioners using variable frequency speed drives
* Type F is also suitable for Type AC and Type-A applications. |
Type EV (Type EV was lauched by BITUOTECHNIK, for breaker/ Din rail type plz contact them by https://www.bituo-technik.com/RCDs-and-RDC-DD.html, if you need ring type/core type, please consider IVY brand) |
- Sinusoidal AC residual current - Pulsating DC residual current |
Mode-3 EV chargingAC EV charging where both AC 30mA (A-type) protection and DC fault current>6mA detection are requested by IEC 61851-1 & IEC 60364-7-722
* Type EV is also suitable for Type AC and Type A applications |
Type B |
- Sinusoidal AC residual current - Pulsating DC residual current |
Three phase electronic equipment Inverters for speed control, ups, mode-3 EV charging, Photo voltaic, Power Electronic Converter Systems, industrial machines, cranes
* Type B is also suitable for Type AC, Type A Type F, and Type EV applications. |
(from IVY METERING)
There are many concepts here that you may need to know:
RCD =Residual current devices (RCDs) – that usually cut off the power supply in case of detecting an imbalance of the electrical current flow, thus providing protection against electrocution and electrical fires. It is one of the widely used measures to protect people and equipment against leakage current.
CBR = Circuit-Breaker incorporating Residual current protection, are circuit breakers with residual current protection function
GFCI = Ground Fault Circuit Interrupter, is the term used in North America for RCCB
RCBO (IEC/EN 61009-1, IEC/EN 62423)= Residual Current operated circuit-Breaker with integral Over current protection, equivalent to the combined FI/LS and LS/DI switches
RCCB (IEC/EN 61008-1, IEC/EN 62423)= Residual Current operated Circuit-Breaker without overcurrent protection, corresponds to the pure FI or DI switches, (is equivalent to RCD residual-current device)
RCM (IEC/EN 62020)= Residual Current Monitor, Residual Current Monitor Device
RCMS = Residual Current Monitoring System
RCU(IEC/EN 61009-1) = Residual Current Units, are residual current triggers for attachment to circuit breakers
PRCD = Portable Residual Current operated Device, are mobile, most commonly found under Personal Protection Adapters
SRCD = Socket outlet Residual Current Device, are FI or DI sockets (to increase the protection level usually in electrical installations with classic zeroing in socket form)
mRCD (IEC 60947-2 (M)): A residual current module used in conjunction with a MCB or MCCB to provide residual current protection. A shunt trip or under-voltage release may be used additionally.
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