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| MIL-R-5757H
Relay: An electric device that is designed to interpret input conditions in a prescribed manner and
after specified conditions are met to respond to cause contact operation or similar abrupt
change in an associated electric control circuit. NOTE: 1) Inputs are usually electric, but
may be mechanical, thermal or other quantities. 2) A relay may consist of several units,
when responsive to specified inputs, the combination providing the desired performance
characteristics..
Relay, differential: A double input relay which is actuated by the polar signal resulting from the
algebraic addition of dual inputs.
Relay, null-seeking: A relay of double-throw configuration and a stable centeroff position. Either side
of the double-throw contact can be activated by and for the duration of the polar actuating
signal.
Relay, sensitive: A relay that operates on low input power commonly defined as 100 milliwatts or less.
Release time: The interval between the trailing edge of a step function input signal and closing of all
normally closed contacts. Bounce time is not included.
Saturation: The condition attained in a magnetic material when an increase in magnetizing (coil)
current produces no appreciable increase in flux.
Shelf life: A period of time a relay can be stored unused before detrimental changes occur which
would cause the item not to properly perform its function within the requirements of this
specification.
Silicone: Any of a group of semi-inorganic polymers based on the structural unit R2SiO, where R is an
organic group, characterized by wide range thermal stability, high lubricity, extreme water
repellence, and physicochemical inertness, used in adhesives, lubricants, protective
coatings, paints, electrical insulation, synthetic rubber, and prosthetic replacements for bodily
parts.
Sensitivity: Pickup value expressed in terms of milliwatts (or watts).
Time, contact bounce: The time interval from initial closure of a contact to the end of bounce during
pickup and dropout.
Time, operate: The time interval from coil energization to initial closure of the last open contact.
Unless otherwise stated, it does not include contact bounce time.
Time, release: The time interval from coil de-energization to initial closure of the last open contact.
Unless otherwise stated, it does not include bounce time.
Time, transfer: The time interval between the opening of the closed contact and the closing of the
open contact of a break-make-contact combination. For multipole relays, transfer time is
defined as the interval between the opening of the last closed contact and the closing of the
first open contact of any set.
Voltage, rated coil: The coil voltage (or current) at which the relay is to operate and meet all specified
electrical, mechanical and environmental requirements.
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