OTOWA LSK-T Series Instruction Manual

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INSTRUCTION MANUAL

Surge protective device (SPD)

Type LSK-T Series

Please read the instructions before installing the product, as this instruction manual explains how to use the SPD

effectively and safely.

The SPD conforms to the induced lightning current test specified in classⅡof IEC61643-11. This SPD does not

withstand direct lightning surges that exceed the value described in the specification, and it may not protect the

equipment connected. Please confirm the detailed specification, size, etc. using the brochure or data sheet.

External view

1. Safety instruction

1) Instruction for use

a) It is exceptionally difficult to predict the energy involved with lightning since it is a natural phenomenon. In the

event of a direct lightning strike exceeding the specification or if there are multiple induced lightning currents in

a short period of time, the SPD may deteriorate, short circuit and in the worst case fail. To prevent these

problems from occurring and protect other equipment, follow instruction ① or ② below.

①The SPD should be installed in a grounded metal enclosure .(Ex：metal distribution board)

②If the SPD is used to protect critical equipment, install Backup Fuse at the rated current more than 125A on the

electric input side of the SPD. (Ref. Table1)

If there are any requests from customer, please follow them.

③

b) The SPD may deteriorate, short circuit or in the worst case fail due to the electrical conditions and application

environment － keep the following instructions to prevent this happening.

① Do not install the SPD on circuits where it is subjected to voltages above specified MCOV.

② Do not use the SPD above the peak value of MCOV (Uc×√2 V), if DC or AC voltage has incomplete wave

shapes.

③ Do not use the SPD in the circuits that are subjected to frequent current surges with a very short interval

between them.

④ Do not expose the SPD to high temperature such as direct sunshine or install adjacent to hot object.

(Application temperature : －40℃ to 70℃)

⑤ Do not expose the SPD to adverse environmental conditions such as rain, wind, steam, dust, and salty air.

⑥ Do not expose the SPD to acid, alkali, corrosion gas, solvent, oil, dust, and salt.

⑦ Handle the SPD carefully to prevent mechanical shock (e.g. drop) or vibration, as this may cause cracking of its

plastic housing.

Table 1 External view and Basic circuit diagram

Basic Circuit diagram

(LSK－TXXXXS)

71.5

Uc:275V

Uc:320V

Uc:385V

※Uc : Maximum Continuous Operating Voltage (MCOV)

Rated current of Backup Fuse

＞125A gL/gG

≦125A gL/gG

No.7136-0661 July 2020

Installation circuit

LSK－T2720S

LSK－T3220S

LSK－T3820S

125A gL/gG

Not necessary

1/4

Table of Contents

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Summary of Contents for OTOWA LSK-T Series

Page 1 No.7136-0661 July 2020 INSTRUCTION MANUAL Surge protective device (SPD) Type LSK-T Series Please read the instructions before installing the product, as this instruction manual explains how to use the SPD effectively and safely. The SPD conforms to the induced lightning current test specified in classⅡof IEC61643-11. This SPD does not withstand direct lightning surges that exceed the value described in the specification, and it may not protect the equipment connected.
Page 2 2) Instruction for regular maintenance a) The SPD must be isolated from the circuit by switching off the isolating switch Main unit on the electric input side of the SPD, or removing the Backup Fuse shown in Table 1, to provide protection from an electric shock. b) When measuring an insulation resistance of the SPD or conducting voltage Fixing base withstand test, disconnect the SPD main unit from the fixing base.
Page 3 × 〇 Push the SPD main unit down until the end not to space Fig.7 Note of inserting condition of SPD main unit 3. Replace of the SPD main unit The SPD main unit can be replaced when the SPD unlikely deteriorates. (The status indicator on the SPD turns red and so on.) When replacing the SPD main unit, please order the SPD main unit referred in Table 2.
Page 4 1) If it is noted that the plastic housing has changed color or shape, replace the SPD. 2) If the status indicator on the SPD operates (Status indicator turns red), replace the SPD main unit. 6. Company OTOWA ELECTRIC CO.,Ltd. (e-mail : overseas@otowadenki.co.jp) Sales head office : 5-6-20, Shioe, Amagasaki-city, Hyogo Pref. 〒661-0976, JAPAN...