Ampere Frame [AF] is the circuit breaker current rating [maximum. Current that the circuit breaker can withstand for a long time. time].Ampere trip [AT] is the current set to trip. switching [typically from 60% to 100% of NF].
Frame – This is considered the body of the circuit breaker. It is the molded, insulated housing made of glass-polyester, thermoset composite resin, or thermoplastic fiberglass material. Trip unit – this is considered the brain of a circuit breaker.
AF refers to the amperage of the circuit breaker frame and AT refers to the trip rating of the circuit breaker in amperes.
The standard output of MCB is 1A, 2A, 3A, 4A, 6A, 10A, 13A, 16A, 20A, 25A, 32A, 40A, 50A, 63A, 100A for MCB.
Ir: Long term (or thermal) setting. This is a multiplying coefficient of the rating of the device. Role: Protection against overload. tr: long-term delay in seconds, which means that the starting current of a motor in particular can be tolerated. Isd: momentary (“magnetic” or “im”).
The trip current rating is the minimum current level at which the MCB will trip immediately. The tripping current must last at least 0.1 s, which is the requirement for the rating. The tripping characteristic can also be referred to as the I-t tripping characteristic.
( AF ) refers to the circuit breaker frame rating in amperes, AF is the maximum current that the circuit breaker can interrupt. This case (100AT/100AF) shows that the breaker is designed for the same interrupting limit, despite its maximum or normal interrupting current, they are treated with the same value.
A circuit breaker is an electrical safety device designed to protect a circuit from damage caused by overcurrent or short circuits. Its basic function is to cut off the flow of electricity to protect equipment and prevent fire hazards.
2P – single-phase 2-pole circuit breaker that also controls the fire line and zero line and has a thermomagnetic trip function.
Divide the wattage required by the voltage to find the current required. For example, a 120 watt device that draws 1,200 volts requires 10 amps.
How many amps are in a watt? As we can see, 1 amp at 120V is 120W. At 220 V, 1 ampere corresponds to 220 watts.
There are three basic types of circuit breakers: standard circuit breakers (which include both single-pole and double-pole circuit breakers), residual current circuit breakers (GFCIs), and arc fault circuit breakers (AFCIs).
Frame size = the maximum ampere rating of disconnect switches with rated current plugs or fuse disconnectors. For example, a 200 amp circuit breaker with a 150 amperage rating plug.
Internally, circuit breakers consist essentially of pairs of metallic contacts, both fixed and moving, in addition to an operating coil. Under normal conditions – closed circuit – these contacts touch and allow the flow of electric current.
Circuit breakers have two current ratings: continuous current and residual current interrupting capacity. Ratings range from 15 amps to 6,000 amps. A breaker’s amperage rating is located on the handle of the device. the protective device does not trigger.