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(2) Adverse service environment
(a) High ambient temperature:
When the starter and contactor are used at an ambient temperature higher than the temperature of the normal
service condition, it is necessary to take into consideration the reduction of load current lest the temperature
(ambient t empera ture + tem pera ture r ise) of t he molded part and t er mina l exceed th e maxim um allowable
temperature and use of heat-resisting wire.
・ Maximum allowable temperature
Phenol-resin molded part : 115℃
Terminal: 105℃
(b) Low ambient temperature:
The tripping characteristic of the thermal overload relay cannot be guaranteed at a temperature lower than
-5℃ and t he per formance of star ter a nd cont a ctor is effect ed by cold brittleness of met a ls a nd insulat ing
materials at such a temperature. Therefore, it is necessary to take into consideration heating by providing the
inside of the board with a space heater to ensure that the temperature there does not fall below -5℃.
However, when the starter and cont actor are exposed temporarily to a low temperature during transportation
to a cold area, even such low temperatures of -30℃ to -40℃ are no cause for concern. It is necessary, though,
to take measures against deformation due to reverse bending of bimetals and brittleness of insulating materials,
thus when placing an order, please inform us if transportation to a cold area is involved.
(c) High humidity:
In case of high humidity, there is the danger of lowering of insulation and decrease of the electrical endur ance,
etc. Accordingly, it is necessary to adopt an appropriate protective structure and perform sufficient maintenance
and inspection.
(d) Adverse atmosphere:
If the starter and contactor are used in an atmosphere containing much dust, corr osive gas, combustible gas,
salt, etc., it is necessar y to provide a protective struct ure which is dust-proof, corrosion-proof, explosion-pr oof,
etc.
(e) Places where vibration and shock are great:
The starter and contactor should not be installed directly to a m achine, equipment, etc. producing particularly
great vibration and shock. If it is unavoidable to install in such a condition, a vibration isolating device should
be provided.
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