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Relays, Reed (Mercury Wetted) General Specification For
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Thermal shock (high and low temperature operation)



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MIL-R-83407B
3.3 Materials. Materials shall be as specified herein. However, when a definite material is not specified, a
material shall be used which will enable the relay to meet the performance requirements of this specification.
Materials used shall be self-extinguishing and shall not support combustion, give off noxious gases in harmful
quantities, give off gases in quantities sufficient to cause explosion of sealed enclosures, cause contamination of the
contacts or other parts of the relay, or form current carrying tracks when subjected to any of the tests specified
herein. Unless otherwise specified (see 3.1), the selection of material shall be such as to provide a shelf life of at
least 2 years without adversely affecting the operation of the relay. Acceptance or approval of any constituent
material shall not be construed as a guaranty of the acceptance of the finished product.
3.3.1 Plastic. Plastic shall be of such quality as to ensure that the relay meets all the performance requirements
of this specification
3.3.2 Ceramic. Ceramic insulating material shall be of such quality as to ensure that the relay meets all the
performance requirements of this specification. Ceramic used for external surfaces shall be glazed.
3.3.3 Base metals. Base metals shall be of a corrosion-resistant type or shall be plated or treated to resist
corrosion.
3.3.4. Magnet wire. Magnet wire used shall enable the relay to meet the performance requirements of this
specification.
3.3.5 Rubber. Rubber shall be of such quality as to ensure that the relay meets all the performance requirements
of this specification.
3.3.6 Fungus resistance. Materials used in the construction of relays shall be fungus inert in accordance with
ASTM G 21.
3.4. Interface and construction. Relays shall be of the design, construction, weight, and physical dimensions
specified (see 3.1). Relays shall be designed to ensure proper operation when mounted as specified (see 3.1).
3.4.1 Enclosures. When specified (see 3.1), relays shall be provided with a metal enclosure for shielding and
magnetic path purposes. When specified, provisions shall be provided for electrically grounding the enclosure.
3.4.2 Encapsulation. Unless otherwise specified (see 3.1), relays shall be encapsulated.
3.4.3 Contacts. Contacts shall have the load ratings and arrangements as specified (see 3.1), and shall be
capable of carrying the maximum rated current continuously, provided an appropriate arc suppression circuit is
connected across each pair of contacts.
3.4.4 Coils. Coils shall be insulated electrically from the frame, the contacts, and the enclosure and shall be
designed for continuous operation at the rated voltage. The resistance and rated voltage shall be as specified
(see 3.1).
3.4.4.1 Terminal identification. Unless otherwise specified (see 3.1), a contrasting colored bead shall be used to
designate X1 (positive, if applicable) terminal.
3.4.5 Circuit diagram. The circuit diagram shall be as specified (see 3.1).
3.4.6 Temperature range. The operating temperature range shall be as specified (see 3.1).
3

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