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|  MIL-R-5757H
3.24 Mixed loads (applicable to high level relays only; see 3.1 and 4.6.22). During cycling (unless
otherwise specified) the dynamic contact resistance of a closed contact shall not exceed the applicable
value specified. The voltage across an open contact shall be 95 percent or more of the applied load
voltage. After cycling, the closed static contact resistance shall not exceed the limits specified.
3.25 Mechanical life (see 4.6.23). After cycling, the insulation resistance and dielectric withstanding
voltage shall not exceed the limits as specified (see 3.1) and the operate and release time shall not
exceed 120 percent of the limits specified (see 3.1). There shall be no mechanical or electrical failure
during or following cycling. Failure of the fuse connected between case and load system ground or
neutral shall constitute a failure. The manufacturer's test system shall have the means to ensure that the
required number of test cycles have been performed.
3.26 Resistance to solvents (see 4.6.24). All markings shall remain legible after testing.
3.27 Marking (see 3.1and 6.2). Relays shall be marked in accordance with MIL-STD-1285, with the
following:
a. Part or Identifying Number (PIN) (see 1.2).
b. Rated coil voltage or current.
c.
Coil resistance (or coil current) (see 3.10.3.1).
d. Contact rating (the highest dc resistive load rating shall be marked when plural loads are
specified (see 3.4.3 and 3.1).
e. Circuit diagram (see 3.4.5).
f.
Terminal identification (see 3.4.4.1).
g. Commercial and Government and date codes in accordance with MIL-STD-1285.
3.27.1 Interchangeability. All parts having the same military PIN shall be directly and completely
interchangeable with each other with respect to installation and performance to the extent specified in the
specification sheet (see 3.1).
3.28 Header glass. Header glass may have small irregularities, such as bubbles, chips, and cracks.
The acceptability shall be based on figure 4 and the following:
a.
Surface blisters whose diameters do not exceed one-half of the radial distance between the
terminal and the corresponding header metal are acceptable (for a cluster of blisters, the overall
cluster diameter shall apply).
b.
Circumferential cracks which originate and terminate in the glass and which extend less than
135 are acceptable (see figure 4, reference B).
c.
Radial cracks with lengths not exceeding three-quarters of the distance between the terminal and
the surrounding header metal are acceptable (see figure 4, reference C).
d.
Tangential cracks which are confined to a single zone are acceptable (see figure 4, reference D).
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