WHAT IS curve in circuit breaker?
Simply put, a trip curve is a graphical representation of the expected behavior of a circuit protection device. They are provided by the manufacturers of circuit protection devices to assist users with selecting devices that provide proper equipment protection and performance, while avoiding nuisance tripping.
What is C and B in MCB?
Type B devices are designed to trip at fault currents of 3-5 times rated current (In). For example a 10A device will trip at 30-50A. Type C devices are designed to trip at 5-10 times In (50-100A for a 10A device). Type D devices are designed to trip at 10-20 times In (100-200A for a 10A device).
What is Abtrip curve?
Common MCB Trip Curves B curve breakers: Trip between 3-5 times rated current in a short circuit situation. B curve MCBs should be applied where loads are resistive and do not have in-rush current. The ideal application is lighting or electronic circuits.
What is C curve in electrical?
‘C’ Curve MCB is used for the protection of circuits with equipment that cause surge current i.e. low-HP motors used for air-conditioners, small mono block and submersible pumps with mainly Inductive Load. Finolex’s B and C Curve MCB’s are a safe and trusted brand for those looking for the best electrical solutions.
What does C curve mean?
This type of MCB trips between 5 and 10 times full load current. This is used in commercial or light industrial type of applications where there could be chances of higher values of short circuit currents in the circuit. The common applications are fluorescent lighting and general power points.
What is RCBO and RCD?
RCD stands for Residual Current Device, while RCB stands for Residual Current Breaker. RCBO and RCCBs, are residual current protection devices. This protection is achieved by monitoring the current flow in the line and neutral. In a healthy circuit, the current flow via the line equals the return flow in the neutral.
What is Rcbo electrical?
Residual current circuit breaker with Overcurrent
Residual current circuit breaker with Overcurrent Protection- RCBO.
What is type B breaker?
A Type B MCB is a common type of miniature circuit breaker used to protect low power domestic circuits and residential application from overcurrent and short circuit faults. The MCB trips the circuit and protects the equipment connected in that circuit from high fault current before getting damaged.
Why do we need different trip curves for circuit breakers?
We need different trip curves in order to balance the right amount of overcurrent protection against optimal machine operation. Choosing a circuit breaker with a trip curve that trips too soon can result in nuisance tripping. Choosing a circuit breaker that trips too late can result in catastrophic damage to machine and cables. How does a MCB work?
What does the trip curve of a MCB mean?
MCB (Miniature circuit breaker) is a re-settable device designed to protect a circuit from short circuits and overcurrents. The trip curve of an MCB’s (B, C, D, K and Z curves) tell us about the trip current rating of Miniature Circuit breakers. Trip current rating is the minimum current at which the MCB will trip instantaneously.
What are the characteristics of a circuit breaker?
1 Overload Protection. The upper portion the time-current curve shows the circuit breaker’s thermal 2 Short Circuit Protection. The lower portion of the time-current curve displays 3 Ground Fault Protection. Like the long-time function, the ground fault 4 Circuit Breaker Coordination. Time-current
Which is the switchgear main circuit breaker curve?
The violet curve is the switchgear main circuit breaker curve. The red curve is the transformer primary fuse curve. The orange curve is the transformer damage curve. The green curves are the cable damage curves.
https://www.youtube.com/watch?v=8ZjqsoiG-nc
