MIL-DTL-24347B
3.4.1 Contact device. The static single contact device in the monitor is considered normally open when normal
voltage and a load current of 1-1/2 amperes (plus or minus 15 percent) or more is available at the monitor. The
normally open contact shall have a minimum continuous rating of 10 amperes, and intermittent rating of 15 amperes.
3.4.2 Input power. The monitor shall meet the performance requirements of 3.4 when powered in accordance with
MIL-STD-1399/300, types II and III.
3.5 Static components. Static components shall be in accordance with MIL-E-917. It is recommended that
MIL-HDBK-5961be used as guidance in the selection of controlled rectifiers, transistors and diodes. Field adjustment
of the sensing circuits shall be provided to compensate for aging of components. Each monitor shall be provided with
a toroid-type current sensing transformer as shown on figure 2 for external mounting on one wire connected on the
load side of the disconnect device.
3.6 Trip duty. The monitor shall sense the load circuit continuously and shall permit the closing and tripping of the
disconnect device continuously at 10-second intervals (see 4.5.6.1).
3.7 Enclosure. The enclosure shall be of dripproof or watertight construction in accordance with MIL-E-2036
(see 6.2), and as shown on figure 3. Holes of 1-1/16 inch diameter shall be placed in the two sides of the enclosure.
The manufacturer shall recommend cable connectors that will ensure dripproof or watertight construction.
3.8 Internal components. Internal components shall be in accordance with MIL-E-917 and shall be mounted in an
assembly which can be readily removed from the enclosure. The terminal board for connection of external wiring
shall be marked as shown on figure 1. Printed circuit boards shall be conformal coated.
3.9 Ventilation. Ventilation shall be by natural draft.
3.10 Environmental.
3.10.1 Ambient temperature. The normal ambient temperature shall be 50 degrees Celsius (°C). The monitor
shall meet the specification requirements when operating in an ambient temperature from 0 to 65°C.
3.10.2 Humidity. The monitor shall meet the requirements specified herein when exposed to an ambient humidity
within the humidity range specified in MIL-STD-810 (see 4.5.14).
3.11 Mounting. The monitor shall comply with the mounting dimensions shown on figure 3. Dimensions for the
monitor current sensing transformer shall be as shown on figure 2 and shall meet the mounting requirements
specified in 3.5.
3.12 Weight. The weight of the monitor and its separate sensing transformer shall be held to a maximum of 4.0
pounds.
3.13 Insulation resistance. The insulation resistance of all circuits shall be not less than 10 megohms (see 4.5.3).
3.14 Dielectric strength. The monitor shall withstand, for 1 minute, a dielectric test voltage between separate
circuits and to ground as follows (see 4.5.11):
Ac ((rms) input or
output voltage)
Test voltage (rms)
60 and under
600
61 to 90
900
91 to 600
1000 plus twice rated
Over 600
2000 plus 2-1/4 times rated
3
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