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Commonly used terms in the Electrical industry.
instantaneous
the range of 0.5 to 30 cycles of the supply frequency.
instantaneous contact
the contacts of a contactor or relay that open or close with no time delay.
instantaneous frequency
(1) the time rate of change of the angle of an angle-modulated wave.
(2) the frequency of radiation at some chosen instant of time; the rate of change of phase in radians per second, divided by 2π.
instantaneous overcurrent relay
an overcurrent relay that operates with no intentional delay following sensing of a power frequency overcurrent, i.e., a current above its set point.
instantaneous power
power in an AC or modulated signal at a given instant in time.
instantaneous-trip circuit breaker
essentially an inverse-time circuit breaker with the thermal element removed. It will only trip magnetically in response to short-circuit currents. Thus, it is often referred to by other names, such as magnetic circuit breaker and magnetic-only circuit breaker.