I have a temperature controller supplied with 230VAC via a 0.5A circuit breaker curve C. The thing is, the MCB trips as soon as power is turned on. I have measured the inrush current profile without the MCB with a current probe: up to 90A for 20ms! I can see three options: The C-curve MCB treats this as a short circuit and the D-curve trips within one minute, whereas the MPCB is much more sensitive and trips within 10s. Coming back to my earlier point, if you oversize the C-curve MCB to compensate for its lower tripping current, you end up running a huge risk of not protecting the motor at all under overloads. 4. Once these wires that are connected to the hot circuits touch the metal enclosure which is grounded, current will flow to the ground causing the ELCB to trip. Disconnect the power and all the circuits to the terminal of the compressor. Use a multimeter and set the scale to measure resistance.

Mini-Split Air Conditioners Lennox MCB, MCB012S4S-1P, 1 Ton, Single Zone, 21 SEER, 21 SEER2, 208-230 VAC 1 Ph 60 Hz, Variable Capacity Ductless Mini-Split Air Conditioner Home

As stated in NEC article 240.85, a circuit breaker with a straight voltage rating, such as 240 or 480 V can be used in a circuit in which the nominal voltage between any two conductors does not exceed the circuit breaker’s voltage rating. Breakers with slash ratings, such as 120/240 V or 480 Y/277 V, can be applied in a solidly-grounded Type B MCB; If the current flowing hits 3 to 5 times the recommended load, then the type B trips. Type C MCB; Type C circuit breakers are perfect for more powerful electric surges. Type D MCB; Type D circuit breakers only activate when the current surges between 10 and 20 times the recommended maximum. Advantages And Disadvantages Of MCB
Used in conjunction with the circuit protection devices - (RCD, RCBO & MCB) - these four types of consumer unit offer the homeowner and electrician huge flexibility of circuit design and budget. It is important to understand that in most domestic properties it would be possible to use any one of the four types of consumer unit, the decision
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    • which mcb is best for ac