MIL-PRF-83383E
6.6.2 Aircraft and equipment maintenance hazards. The standard safe response time is 12 milliseconds maximum
(see 3.9). Presently, all slash sheets have a response time in excess of 12 milliseconds. Extra precautions should be
taken to protect maintenance personnel from shock. For example, if maintenance proceeds under power-down
conditions and the I/CU lines are being manipulated, maintenance personnel can suddenly be exposed to electrical
shock for up to 25 milliseconds if power-up occurs. This exceeds the accepted maximum industry standard of 12
milliseconds.
6.7 Application note. Coordination between devices supplied by different manufacturers should be verified by the
user.
6.8 Operating principle. The RCCB is basically the marriage of a relay and a circuit breaker and allows the
utilization of each identity singularly or in combination. The RCCB is normally located in the most direct line possible
between the source and load. It operates in conjunction with the I/CU which is a small ½ ampere device which can be
located convenient to operating personnel. When the RCCB trips from an overload, a current pulse in turn trips the
I/CU. To reset the RCCB, the I/CU is manually closed. The I/CU is normally located some distance from the RCCB
and connected via light guage wire, thereby eliminating long runs of heavy wire. The line impedance plus the I/CU
impedance must not exceed 7.5 ohms. The RCCB can be operated as a relay via the manual operation of the I/CU.
Back-up control power can be used to operate the RCCB in the event of loss of main power. NOTE: The I/CU is not
furnished with the RCCB.
6.9 Subject (key word) listing.
Coordination
Endurance
Interrupting capacity
TJS
Triple pole
6.10 Part or Identifying Number (PIN). This specification requires a PIN that is as described in the appropriate
reference to associated documents (see 3.1).
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