scope:

This specification covers the general requirements for electromagnetic, hermetically sealed relays for use in electronic and communication-type equipment (see 6.1). These relays are designed to operate over the full range from low level to power switching with contact ratings up to 10 amperes alternating current (ac) or direct current (dc). The failure rate level is established at a confidence level of 90 percent for qualification and 60 percent for maintenance of qualification based on 100,000 cycles at 125°C under the rated load conditions specified herein. CAUTION: The use of any coil voltage less than the rated coil voltage will compromise the operation of the relay. For additional application and caution information see 6.1.

The military part number shall consist of the letter "M", the basic number of the specification sheet, an assigned dash number (see 3.1), and a suffix letter designating failure rate level (see table I) as shown in the following example:

The failure rate level designation is shown in table I (see 4.6). TABLE I. Failure rate level designation.

Failure rate level Failure rate level designation (percent per 10,000 cycles) ----------------------------------------------------------- L - - - - - - - - 3.0 M - - - - - - - - 1.0 P - - - - - - - - 0.1 R - - - - - - - - 0.01

The following processes, requirements, and methods of examination are offered as guidelines for performing the internal visual inspection and cleaning of relays prior to canning. These guidelines may be used both by the supplier in preparing his internal procedures and by the audit team in reviewing a supplier's procedures. This information is not intended to provide all possible requirements, processes and test methods for internal inspections and cleaning. They are merely guidelines and should be used as such by the supplier and the audit team. Actual inspection procedures and criteria shall be in accordance with the supplier's process as approved by the qualifying activity.

The purpose of this test is to detect the presence of free moving particulate contaminants within sealed cavity devices. This test method is specifically directed toward relays and other devices where internal mechanism noise makes rejection exclusively by threshold level impractical. The test provides a nondestructive means of identifying those devices containing particles of sufficient mass that, upon impact with the case, excite the transducer. This appendix is a mandatory part of the specification. The information contained herein is intended for compliance.

intended Use: