Types of RCD. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Types of RCD. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Current Devices

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There are various RCDs in terms of technical design. Below is an approximate classification of RCDs.

1. By appointment

RCD without built-in overcurrent protection;
RCD with built-in overcurrent protection.

RCDs with built-in overcurrent protection are divided into groups according to the instantaneous trip characteristic:

type B
type C
type D

2. According to the condition of the dependence of performance on voltage:

RCDs that are functionally independent of voltage;
RCD functionally dependent on voltage.

3. According to the position of the power contacts and the preservation of protective functions in the absence of voltage:

RCDs that automatically open power contacts when the supply voltage fails and close them when the voltage is restored;
RCDs that automatically open power contacts when the supply voltage fails and do not close them when the voltage is restored;
RCDs that do not open power contacts when the supply voltage fails, but retain their protective functions, i.e. the ability to open the power circuit in the event of a differential current;
RCDs that do not open power contacts when the supply voltage fails and lose their protective functions, i.e. incapable of tripping when a residual current occurs.

4. According to the installation method:

RCD for stationary installation with fixed wiring;
RCDs are mobile (portable type) and for cord connection.

5. By the number of poles and current circuits:

bipolar with two protected poles;
four-pole with four protected poles.

6. According to the operating conditions in the presence of a constant component of the differential current:

RCDs of the AC type, responding to a sinusoidal alternating differential current, slowly increasing or occurring abruptly;
Type A RCDs that respond both to sinusoidal alternating differential current and to pulsating direct (rectified) differential current, slowly increasing or occurring abruptly;
Type B RCDs responding to differential currents - sinusoidal alternating, pulsating direct, pulsing direct with a superimposed smoothed ripple of direct current with a value of 0,0006 A, slowly increasing or occurring abruptly.

7. By the presence of time delay:

RCD without time delay - type of general application;
RCD with time delay - type S and type G (selective).

Publication: electro.narod.ru

See other articles Section Current Devices.

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