MIL-PRF-24021K
3.3.20 Overload protection. A circuit protective device shall be provided for each monitor in
order to protect the circuit which supplies or carries (as applicable) the current to the contactor.
Monitors shall be protected for 10 amperes as follows: M24021-3 monitors at pin 5, M24021-5
monitors at pin F, and M24021-6 monitors at pin A. The devices shall be a fast-acting type
designed for protection of semi-conductor devices.
3.4 Performance. The power monitor shall meet the following performance requirements for
AC and DC operation.
3.4.1 Input power requirements.
3.4.1.1 Input of electric power to AC monitors. Each AC monitor shall withstand without
damage, and shall not reset automatically upon application of three-phase, four-wire, wye-
connected, grounded-neutral, alternating potential having the following characteristics when
applied according to figure 5 or 6, as applicable.
a. Three-phase, steady-state voltage, of a frequency between 300 and 500 Hz between line and
neutral, and applied between monitor pin 4 and pins 1, 2, and 3, or between pins G and A, C and E,
as applicable. The monitor shall not be damaged when these voltages in the range of 0 to 140 volts
RMS are applied continuously and in the range of 140 to 200 volts RMS are applied for a period of
one-half hour.
b. Total harmonic content shall be not greater than 5 percent of the fundamental. Individual
harmonic content shall be not greater than 3 percent of the fundamental.
c. Any phase sequence.
d. Three phase steady-state voltages of 115 RMS volts and 60 Hz frequency applied between
monitor pin 4 and 1, 2, 3 or between pins G and A, C and E, as applicable for 30 seconds.
3.4.2 Input power to DC monitors.
3.4.2.1 Input of electric power to power lead (pin G) and sense lead (pin B). Each DC monitor
shall withstand without damage, and shall not reset automatically regardless of inhibit voltage value
upon application of, grounded-negative direct potential having the following characteristics when
applied to pins G and H, and B and H, in accordance with figure 7.
a. Any average value between -80 and +80 volts applied continuously.
b. Ripple from a power source whose individual frequency characteristics are in the 10 Hz to
40 kHz range and whose ripple voltage can vary from 0 to 10 volts peak-to-mean.
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