This test aimed to test the trip time characteristic of MCB if it’s within limits or no and check MCB auxiliary contact if it is available. Main keywords for this article are What is MCB, MCB, What is miniature circuit breaker.
What is MCB?
MCB stands for “Miniature Circuit Breaker.” It is an electrical protection device widely used in residential, commercial, and industrial electrical distribution systems to safeguard against electrical faults and overcurrents. MCBs are compact and designed to automatically disconnect the electrical circuit in case of an overload or short circuit, preventing damage to electrical appliances and potential fire hazards.
All fuses have to be compelled to get replaced with MCB switch for higher safety and management after they have done their job within the past. not like a fuse, AN MCB switch operates as automatic switch that opens within the event of excessive current flowing through the circuit and once the circuit returns to traditional, it are often reclosed with none manual replacement.
MCBs area unit used primarily as an alternate to the fuse switch in most of the circuits. a good kind of MCBs are in use these days with breaking capability of 10KA to 16KA, altogether areas of domestic, business and industrial applications as a reliable means that of protection.
Required equipment for Miniature Circuit Breaker Test
- Sverker (used as current source).
- Multi-meter.
Mechanical checked and visual inspection
- Check tightness for all wires.
- Check ferrules.
- Check for physical damage or defect.
Test connection and procedure for Miniature Circuit Breaker
Connect sverker (which used as current source) direct to MCB switch, check MCB type and its rated current value.
Inject from sverker twice of its rated current and measure the trip time in which MCB switch will be tripped, compare the measured trip time with its acceptable limit from MCB switch manual depending on its type.
Auxiliary contact should be checked in both condition of MCB (open/close) and check that auxiliary contact change its status from being open to close or vise, depending on its nature Normally open or Normally close.
Industry coded for Miniature circuit breaker
NESC: National Electrical Safety Code.
NFPA: National Fire Protection Association.
NEC: National Electrical Code (2008 Edition).
ASTM: American Society for Testing and Materials.
IEC: International Electrical Commission.
IEEE: Institute of Electrical and Electronic Engineers.
NETA: National Testing Association.
Nice blog and content, I really excited, thanks for share!