← 3.2 Equipment at Consumers intake point
Main fuse and circuit breaker
Electrical Technology · Grade 10 · about 40 minutes
How the main fuse or MCB protects the installation against overload and fault current, and how a fuse differs from a resettable breaker.
Sign in to read this lesson
Lessons are for learners and teachers with an account. Browsing the curriculum — subjects, strands and what each sub-strand covers — stays open to everyone.
- 7 sections of explanation, worked examples and diagrams
- 1 practice task with hints and worked answers
- A quiz that marks itself as you go
- Your progress kept across every subject you take
Other lessons in this sub-strand
- Equipment at the consumer intake point
- The KPLC service line
- The supplier cut-out
- The energy meter
- The main isolation switch
- Main fuse and circuit breaker
- The consumer unit
- Functions of the control equipment
- Installing intake equipment in sequence
- The consumer earthing point
- Installing an earth electrode
- Why intake equipment must follow the rules