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Types of RCD/RCBO

The Different Types

RCD’s exist in various different forms and react differently depending on the presence of DC components or different frequencies. The following RCD’s are available with the respective symbols and the designer or installer is required to select the appropriate device for the specific application:

Type AC – General purpose use RCD can detect & respond to AC

sinusoidal wave only.

Type A – Equipment incorporating electronic components

RCD can detect & respond as for type AC, PLUS pulsating DC components.

Type F – Equipment with frequency-controlled speed drives

RCD can detect & respond as for type A, PLUS high frequency residual current.

Type B –Electric vehicle chargers, PV supplies.

RCD can detect & respond for type F, PLUS smooth DC residual current.

RCD Examples of type of equipment / load

Resistive, Capacitive, Inductive loads generally without any electronic components, typically:

  • Immersion heater
    • Oven/Hob with resistive heating elements • Electric shower
    • Tungsten & halogen lighting

Single phase with electronic components, typically:

  • Single phase invertors
  • Class 1 IT and Multimedia equipment
  • Power supplies for Class 2 equipment
  • Appliances such as a washing machine

that is not frequency controlled e.g. d.c. or

universal motor

  • Lighting controls such as a dimmer switch

and home and building electronic systems

LED drivers

  • Induction hobs
  • Electric Vehicle charging where any smooth

DC fault current is less than 6 mA

Type A is also suitable for Type AC applications.

Frequency controlled equipment / appliances, typically:

  • Some washing machines, dishwashers and driers e.g. containing synchronous motors*
  • Some class 1 power tools
  • Some air conditioning controllers using

variable frequency speed drives

Type F is also suitable for Type AC and Type A applications.

Three phase electronic equipment typically:

  • Inverters for speed control
  • UPS
  • Electric Vehicle charging where any smooth

DC fault current is greater than 6mA

  • Photo voltaic
  • Power Electronic Converter Systems (PECS)

typically:

  • Industrial machines
  • Cranes

Type B is also suitable for Type AC, Type A and Type F applications.

Shop for Type A RCBOs with Electrical4Less 

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