The continuous current (at the rated voltage) on ANSI breakers or the normal current on IEC breakers. This maximum rating should always be in excess of the utilization equipment rating to provide for a short-time overload capability. It is also referred to as the Frame Rating or the Frame Size.
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The rated short circuit capacity or interrupting capacity. The short circuit current is rated at the breaker's maximum voltage (ANSI) or voltage class (IEC).
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The trip unit’s function is to trip the operating mechanism (open the circuit) in the event of thermal overload, short circuit current (fault current), or ground fault.
The tripping mechanism is comprised of a thermal actuator and a mechanical latch designed to discriminate between in-rush or temporary current surges and prolonged overloads. Applications include motors, transformers, solenoids and low voltage wiring.
This type of circuit breaker combines a bimetal element with a magnetic coil to provide time/current characteristics with two distinct steps. The magnetic coil activates quickly at high overcurrent values. Prolonged low value overloads cause the thermal element to activate. Applications include telecommunications, process control, and similar applications requiring precision performance.
Electronic trip units are composed of three components, internal to the trip unit. These components are the current transformer, circuit board and flux-transfer shunt trip (for remote controlled tripping of the breaker). There are two types of electronic trip units: Analog and Digital.
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Molded case circuit breakers are tested and rated according to the UL 489 Standard. Their current carrying parts, mechanisms and trip devices are completely contained within a molded case of insulating material. MCCBs are available in various frame sizes with interrupting ratings for each frame size.
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Miniature circuit breakers (MCBs) are a specific type of circuit breaker used to switch and protect the lowest common distribution voltage in an electrical system. They are generally used in a loadcenter, panelboard, or similar device.
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Molded case circuit breakers are available with special features making them suitable for the protection of motor circuits when used in conjunction with a separate overload protection device. In these applications, they are often referred to as motor circuit protectors (MCPs).
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Remote control circuit breakers (RCCBs) are devices that combine the function of a conventional circuit breaker and a relay into one device. They can be remotely activated to trip the circuit.
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Conventional MCCBs are available with either a fixed or interchangeable electromechanical trip unit. If a new trip rating is required for a fixed trip breaker, the entire breaker must be replaced. With an interchangeable trip unit, only the trip unit needs to be changed, up to the maximum current rating of the breaker frame. Interchangeable trip units are also called rating plugs. Some breakers offer interchangeability between electromechanical and electronic trip units within the same frame.
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The circuit breaker opens automatically when the voltage drops below the trip level. When the voltage level has reached the reset level, the circuit breaker can be reclosed.
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Supplementary protectors are used domestically and internationally. They pass several international standards as circuit breakers, but do not qualify as circuit breakers in the United States. They are not UL approved, only UL recognized. Supplementary protectors provide overcurrent protection, but cannot serve as the only source of protection. Supplementary protectors are available in current ratings from 0.1 to 63 amps.
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This breaker has a solid state trip unit. It detects ground currents (which are small short circuits from one phase to ground), and trips to protect both people and equipment.
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Miniature circuit breaker poles are generally one inch in width. However, some breaker designs allow two poles to fit in the standard one-inch space. This breaker type is called a duplex circuit breaker (or "half-size branch circuit breaker"). Twice as many protective devices fit in the same amount of available space, with the same ampere rating and without sacrificing protection or features.
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Medium Voltage Circuit Breaker Arc Extinguishing Method
This is an arc extinguishing technology featuring a pair of separable contacts enclosed in a vacuum-tight envelope. Since the environment inside the interrupter envelope is a vacuum, an arc cannot be sustained easily.
Other technology such as vacuum interrupter with spiral contacts, SF6 puffer type, magnetic coil, rotary arc type, etc.
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Fixed mount circuit breakers are usually found in outdoor applications. When installed outdoors, a special type of housing must be provided to protect the equipment from the elements.
These line-side terminals clip onto a bus stab in the loadcenter or panelboard. The load-side terminal is cable-out. This mounting method is used in residential applications.
These line-side terminals have an extended tang that bolts onto the panelboard bus. The load-side terminal is cable-out. This mounting method is used in commercial and industrial applications.
Circuit breakers that mount on a standard DIN rail.
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This is the full required range of ambient operating temperature.
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