FIGURE 12.
● The circuit protection difficult interfere with.
● The supply may safely restored unskilled operator. The toggle switch can also used disconnect the
circuit for maintenance isolation test the MCB for satisfactory
operation.
● faulty circuit may easily and quickly restored.3
MCBs Breaker, fits Wylex Standard consumer unit (Courtesy Wylex).
● They contain mechanical moving parts and therefore require regular
testing ensure satisfactory operation under fault conditions.
The circuit can restored when the fault removed pressing the ON
toggle.
● The circuit provided with discrimination.
CHARACTERISTICS MCBs
MCB Type 60898 will trip instantly between three and five
times its rated current and also suitable for domestic and commercial
installations.
● faulty circuit may quickly identified.
. This latches the various mechanisms within the MCB and ‘makes’
the switch contact.Overcurrent, short circuit and earth fault protection
243
electromagnetic devices normal operation but under overcurrent condi-
tions they activate and trip the MCB.
ADVANTAGES MCBs
● They have factory set operating characteristics.
DISADVANTAGES MCBs
● They are relatively expensive but look the advantages see why
they are popular these days.
● Tripping characteristics and therefore circuit protection set the
installer
