Technical Terminology & Cautions for Use

AECTB38E 201811-T

CAUTIONS FOR USE

■ Environment of use

1) Please consult us when using under the following conditions:

• Environments where hydrogen sulfide or other corrosive gases

are present.

• Environments where gasoline, thinner or other flammable,

explosive gases are present.

• Dusty environments (for non-seal type snap action switches).

• Use in environments not in the prescribed temperature or

humidity range.

• Places with low air pressure.

2) Unless specified the product will not be constructed to

withstand water, oil or explosions. Please inquire if you intend to

use the product in special applications.

■ Usage, storage, and transport conditions

1) During usage, storage, or transportation, avoid locations

subject to direct sunlight and maintain normal temperature,

humidity, and pressure conditions.

2) The allowable specifications for environments suitable for

usage, storage, and transportation are given below.

(1) Temperature: The allowable temperature range differs for

each switch, so refer to the switch’s individual specifications.

(2) Humidity: 5 to 85% R.H.

(3) Pressure: 86 to 106 kPa

The humidity range varies with the temperature. Use within the

range indicated in the graph below.

(The allowable temperature depends on the switch.)

• Condensation will occur inside the switch if there is a sudden

change in ambient temperature when used in an atmosphere of

high temperature and high humidity. This is particularly likely to

happen when being transported by ship, so please be careful of

the atmosphere when shipping. Condensation is the

phenomenon whereby steam condenses to cause water

droplets that adhere to the switch when an atmosphere of high

temperature and humidity rapidly changes from a high to low

temperature or when the switch is quickly moved from a low

humidity location to one of high temperature and humidity.

Please be careful because condensation can cause adverse

conditions such as deterioration of insulation, coil cutoff, and

rust.

• Condensation or other moisture may freeze on the switch when

such as sticking of movable parts or operational time lags.

• The plastic becomes brittle if the switch is exposed to a low

temperature, low humidity environment for long periods of time.

• Storage for extended periods of time (including transportation

periods) at high temperatures or high humidity levels or in

atmospheres with organic gases or sulfide gases may cause a

sulfide film or oxide film to form on the surfaces of the contacts

and/or it may interfere with the functions. Check out the

atmosphere in which the units are to be stored and transported.

• In terms of the packing format used, make every effort to keep

the effects of moisture, organic gases and sulfide gases to the

absolute minimum.

■ Wiring

1) When using a PC board terminal switch as soldering

terminals, use thin lead wires and be sure to wind them on the

terminals before soldering.

2) Cautions when soldering

Perform soldering quickly in accordance with the specified

conditions. Be careful not to let flux flow into the product. When

no instruction is specified, use a soldering iron with a tip

temperature of 350

°C or lower and complete soldering within

five seconds. Do not pull on the lead wires immediately after

soldering. Wait some time before verifying.

■ Others

1) Failure modes of switches include short-circuiting, open-

circuiting and temperature rises. If this switch is to be used in

equipment where safety is a prime consideration, examine the

possible effects of these failures on the equipment concerned,

and ensure safety by providing protection circuits or protection

devices. In terms of the systems involved, make provision for

redundancy in the design and take steps to achieve safety

design.

2) The ambient operating temperature (and humidity) range

quoted is the range in which the switch can be operated on a

continuous basis: it does not mean that using the switch within

the rating guarantees the durability performance and

environment withstanding performance of the switch. For details

on the performance guarantee, check the specifications of each

product concerned.

3) Even if 2-pole, 3-pole or 4-pole switches are used as single-

pole switches in order to increase contact reliability, please keep

the maximum current no higher than the rated value.

4) If there is the possibility of a short between poles, please use

an in-phase circuit as shown below or provide a spare pole.

5) Be careful not to drop the product as this may cause loss of

functionality.

6) Do not apply an unreasonable vertical force against the

direction of operation of the product.

7) Use your hand to operate the actuator.

(Operation using a tool such as a screwdriver or hammer can

cause breakdown.)

Tolerance range

(Avoid

condensation when

used at temperatures

higher than 0

(Avoid freezing when

used at temperatures

lower than 0

85

5

–40

–40

0

+32

+85

+185

Temperature,

Humidity, %R.H.

Bad example

Good example (1)

Good example (2)

Load 1

Load 1

Heteropolar circuit

In-phase circuit

Load 2

Load 1

Spare pole

Load 2

Load 2

ー 6 ー