6. NOTES
MIL-R-835168
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. Relays conforming to this specification are intended for use in dc or ac (single or polyphase) electronic and communication equipment as a means of controlling the making and breaking of circuits for electrically operated equipment and devices.
6.1.1 Paralleling contacts. Contacts shall not be paralleled on the assumption that doing so will increase their switching capacity. 8eing paralleled for the sake of redundancy may result in make before break, due to one transfer contact operating slightly ahead of the other.
6.2 Ordering data. The contract or purchase order should specify the following:
a. Title, number, and date of this specification.
b. Title, number, and date of the applicable specification sheet, and the specification sheet part number (see
3.1).
6.3 Qualification. With respect to products requiring qualification, awards will be made only for products which are, at the time of award of contract, qualified for inclusion in Qualified Products List QPL No. 83516 whether or not such products have actually been so listed by that date. The attention of the contractors is called to these requirements, and manufacturers are urged to arrange to have the products that they propose to offer to the Federal Government tested for qualification in order that they may be eligible to be awarded contracts or orders for the products covered
by this specification. Information pertaining to qualification of products may be obtained from (insert name, mailing address, and email of qualifying activity). An online listing of products qualified to this specification may be found in
the Qualified Products Database (QPD) at https://assist.daps.dla.mil.
6.4 Tin whisker growth. The use of alloys with tin content greater than 97 percent, by mass, may exhibit tin whisker growth problems after manufacture. Tin whiskers may occur anytime from a day to years after manufacture and can develop under typical operating conditions, on products that use such materials. Conformal coatings applied over top of a whisker-prone surface will not prevent the formation of tin whiskers. Alloys of 3 percent lead, by mass, have shown to inhibit the growth of tin whiskers. For additional information on this matter, refer to ASTM-8545 (Standard Specification for Electrodeposited Coatings of Tin).
6.5 Subject term (key word) listing.
Cathode contact resistance Coil transient suppression Cross talk
Electrostatic shielding Insulation shielding Magnetic interface
Static contact resistance
6.6 Environmentally preferable material. Environmentally preferable materials should be used to the maximum extent possible to meet the requirements of this specification. As of the dating of this document, the U.S. Environmentally Protection Agency (EPA) is focusing efforts on reducing 31 priority chemicals. The list of chemicals and additional information is available on their website at https://www.epa.gov/osw/hazard/wastemin/priority.htm. Included in the list of 31 priority chemicals are cadmium, lead, and mercury. Use of these materials should be minimized or eliminated unless needed to meet the requirements specified herein (see section 3).
6.7 Magnetic interference. Relays are subject to interaction with stray magnetic fields. To keep within operating parameters, relays shall be mounted as specified (see 3.1).
6.8 Glossary. The definitions listed herein are definitions of the technical terms as applied within this specification.
6.8.1 Coil. One or more windings on a common form.
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