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Handling Precautions for

Screw Terminal Blocks(ML)To ensure safe use, be sure to read these precautions together withthe general precautions.
Feel free to contact the Customer Service Center if you have any questions.

Precautions for Use(1/2)●Check the product specifications before use.
●Use the appropriate product mounting method (ensuring insulation distance), connecting wires,and copper foil pattern of printed circuit in accordance with the working voltage and current.
●The rated current represents the maximum current that one pole can carry. When a product allows
the connection of two or more wires to one pole, make sure that the total current does notexceed the rated current.
●When connecting and disconnecting wires, make sure that the power is off.
●When tightening screws, make sure that the screw driver bit (tip) and the tightening torque areappropriate for the size of the screws.
Terminal screw size
Ｍ2.6
Ｍ3
Ｍ3.5
Ｍ4
Ｍ5
Ｍ6
Ｍ8
Tightening trque：Ｎ・ｍ

0.4

0.5

0.8

1.2

2.0

2.5

6.0

※The torque range for some products is different from the above. Be sure to check theindividual specifications before use.

●Tightening torque for some products is different from others. Check the individualspecifications.
●Before inserting or removing a plug from a receptacle of a connector-type product, make surethat no load is applied (the power is off).
●When using bare crimp terminals, ensure the necessary insulation distances, and cover charged
parts with insulated tubes to prevent electric shocks and short circuiting. (Figure A)●When using multiple crimp terminals on one pole, the number of terminals must be within thelimit that allows the necessary insulation distances between the pole and adjacent poles.
(Figure B)
Insulation
distance
Crimp
terminal

Bare crimp
terminal
Insulation
distance
Figure A

Figure B●Screws may become loose due to vibration, temperature changes in the operating environment,
etc., potentially resulting in contact failure or heat generation. Therefore, tighten screws
regularly.
●Do not use soldered stranded wires. Using such wires may cause screws to loosen.
●When handling terminal blocks with charged parts exposed, be careful not to cause electricshocks or short circuiting.
●When inserting or removing a plug from a receptacle of a connector-type product, keep itstraight without twisting it.
●Solderability depends on actual conditions, such as equipment and printed circuit board on which
the product is to be mounted, including flux creep-up. Be sure to check after the product ismounted on the equipment.
●Note that products cannot be used in the following places: hot or cold places; moist places;
places where condensation or freezing occurs; places exposed to direct sunlight; places subject
to vibration and impacts; dusty places; places exposed to water, various types of oils,chemicals (including detergent), corrosive gases, etc.
●Depending on the cleaning solvent and washing conditions, immersing products for cleaning may
damage them. Do so with care.
●Note that products certified to overseas standards are subject to restrictions on specifications
according to each overseas standard.

Precautions for Use(2/2)●Consider fixing connected wires so that no tension is applied to the connected wires.
●When connecting wires or crimp terminals, make sure that necessary insulation distances aresecured between them and adjacent poles, mounting panels, and other products.
●When tightening screws that are not connected to wires, the tightening torque must be between
0.2 and 0.3 N-m. (The torque range for some products is different from the above. Be sure tocheck the individual specifications before use.)●When connecting or disconnecting electric wires, be careful not to apply more load thannecessary to the product. When tightening or loosening screws, take care not to rotate the bodyor bend the terminals. Particularly be careful when handling right angle type terminal blocks
and those with a small number of poles.
●When mounting a product, do not apply excessive tightening torque exceeding the specified
tightening torque.
●Take care not to lose terminal screws or other parts removed during installation or wiring ofproducts.
●Do not disassemble or reassemble coupled products. Doing so may result in quality problems.
●When using plug-in terminals, be careful not to twist them when inserting them into or removing
them from receptacles.
●The terminal blocks are for indoor equipment. Do not use them for outdoor purposes.
●Insulation measures, such as laying an insulator under the body, are required when mounting thefollowing products on a metal panel: any product whose charged part is exposed because thebottom of the main body is not covered with insulation (e.g.: ML-1765, etc.), and any productwhose charging part comes close to the mounting panel (e.g.: ML-3391 etc.).
●Polycarbonate covers are susceptible to organic solvents and alkalis, and have a tendency tocrack or fracture.