Annual Report 2003-2004

NRITransmission & Distribution Research CenterProject Title:NRI Miniature Circuit Breaker LabDepartment: High VoltageProject Manager: S. AbyaziEmployer: Niroo Research Institute Project Code: ---Project Staff: A.R. Moradian, M. Oskuoee, S. Abyazi, R. Behzadi, M. Dorfaki.Summary:Great usage of miniature circuit breakers (MCB’s) in industrial and housingapplications in two recent decade is showing their importance role in electricalprotection systems safety and reliability.MCB’s function is protecting electrical apparatus, such as wires, cables and againstproblems related to the current faults accuring in electric circuits like as firing,explosion and electrocution. Therefore having safe exploitation and secure systemoperation to electrical energy by using of qualitative MCB’s has a vital importance.A lot usage of MCB’s have caused numerous producers for those. Nonconformity ofmany MCB’s requirements to international standard and lack of existance of refrencecredit organizations for giving technical certifications for MCB’s result in to tendencyof people to use non standardized MCB’s (and usually to lower price) consequently, weexploit inproper and nonsecure from electrical energy.Type tests is down in NRI MCB lab according to IEC 60898-2002Following tests is done in mcb lab Marking & Indelibility of marking. Mechanism. Clearances and creepage distances. Non-interchangeability. Reliability of screws,current-carrying parts and connections. Reliability of screw-type terminals for external conductors. Protection against electric shock. Resistance to heat.44