MIL-PRF-83383E
4.6.4.1 Qualification and periodic inspection.
a. Minimum limit of ultimate trip: The RCCB shall be subjected to an overload of 115 percent of rated current
at 25°C ±5°C for a minimum of 1 hour and the tripping time shall be measured. The temperature rise of the
RCCB terminals shall be obtained by the use of a suitable thermocouple attached to the terminals outside,
but adjacent to the RCCB case.
b. Maximum limit of ultimate trip: The RCCB shall be subjected to an overload of 138 percent of rated current
at 25°C ±5°C and the tripping time shall be measured.
c.
Overload calibration: The RCCB shall be subjected to overloads of 200, 400, and 1000 percent of rated
current at -54°C ±5C, 25°C ±5°C and 71°C ±5°C, and the tripping times shall be measured. During this
test, the RCCB shall be tested with each major axis held in the vertical plane and in any other position likely
to cause malfunctioning.
d.
Ambient effect on calibration: The RCCB shall be subjected to overloads of 115 and 160 percent of rated
current at -54°C ±5°C, 100 and 138 percent of rated current at 71°C ±5°C, and the tripping times shall be
measured. At 100 and 115 percent of rated current, the current shall be applied for a minimum of 1 hour.
4.6.4.2 Group A inspection.
a. Minimum limit of ultimate trip: The RCCB shall be subjected to an overload of 115 percent of rated current
at 25°C ±5°C on all poles for a minimum of 1 hour and the unit must not trip
(see table I). At the manufacturer's option, this test may be substituted for by another minimum limit of
ultimate trip test when a correlation between the two test methods can be substantiated to the satisfaction
of the qualifying activity.
b. Maximum limit of ultimate trip: The RCCB shall be subjected to an overload of 138 percent of
rated current at 25°C ±5°C, and it must trip within 1 hour (see table I).
c.
Overload calibration: The RCCB shall be subjected to an overload of 200 percent of rated
4.6.5 Voltage drop (see 3.8). RCCB's shall break and then make rated current for 10 consecutive operations prior
to measurement. With the RCCB carrying rated current, the voltage drop from the line terminal(s) to the load
terminal(s) shall be measured. The voltage drop across the auxiliary contacts shall be measured at the terminals of
the terminal junction system using the pin contact specified (see 3.4.5.2), or equivalent.
4.6.6 Response time (see 3.9). RCCB's shall be closed and carrying rated current. The power shall be removed
and the I/CU opened. The power shall be reapplied and the opening time of the RCCB measured.
4.6.7 Power requirements and response time at minimum voltage (see 3.10).
Minimum opening voltage: With the RCCB stabilized at -54°C ±5°C, 25°C ±5°C, and 71°C ±5°C and the
a.
I/CU closed, monitor main contact position and apply power and an overload such that with 2½ volts (dc or
ac, 400 Hz) (see 3.1) at the line terminal(s), the RCCB should open automatically. No back-up power shall
be applied.
b.
Standby current drain and actuation current: With the RCCB stabilized at room temperature, apply the
specified back-up voltage (see 3.1) to the appropriate TJS terminal. Close the I/CU and measure the
standby current drain, remove back-up power and repeat measurement after applying the specified line
voltage (see 3.1); then open and close the I/CU and monitor the actuating current at each voltage.
c.
Maximum operating time at minimum voltage: With no back-up power and the minimum specified voltage
(see 3.1) at the line terminal(s), "open" then "close" the I/CU and measure the corresponding opening and
closing times of the RCCB main contacts.
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