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User's Manual 

MS3707 

Slim Plug-In Distributor with Isolated Single/Dual Output 

Document No: MQPDK-110426-5                                                                Rev. 1.70 

 

 

 

AD Ichigaya Building 4F 
2-5 Ichigaya-Honmuracho 
Shinjuku-ku, Tokyo, 162-0845 
Phone: +81 (0) 3-6280-8635 

 

Thank you very much for employing MTT products. 

Upon receipt of the product(s), please check the affixed label to 

make sure that the specifications shown therein conform to your 

requirements. If you find any discrepancies and/or any damage on 

the product(s), please contact MTT or its local representatives. 

You can be assured that all the MTT products are manufactured 

according to the strict quality control standards.

 

 

1. Introduction

 

For proper operation of the instrument(s), we recommend that you 

carefully read this manual prior to operation. The manual should be 

retained for future reference. Please also refer to the relevant 

product specification sheet.

 

 

2. For Safe Operation

 

Be sure to observe the following safety clauses in your operation of 

the instrument(s). MTT cannot undertake any responsibility and 

guarantee for any damage and/or loss caused by improper 

operation contrary to or neglecting these clauses.

 

 

The following safety symbols are used on the instrument and in this 

document:

 

 

Equipment protected throughout by double insulation or 
reinforced insulation 

 

Functional earth terminal (Do not use this as a protective 
earth terminal.) 

 

 

 

3. Precautions

 

Be sure to observe the following precautions to ensure proper 
operation of the instrument(s). If these precautions are disregarded, 
the performance of the instrument(s) cannot be guaranteed.

 

For Handling:

 

  This is a precision instrument. Do not drop or throw the 

instrument. 

  This product contains electronic parts. Do not splash water on 

the product and do not dip it in water. For installation, select a 
place where no condensation occurs. 

  Avoid storing or installing the instrument in locations subject to 

direct sunlight, high temperature, dust, high humidity or vibration. 

On Power Supply: 

Check the power rating on the specification label of the unit to 
ensure you use the correct power supply. 

  Rating 100 to 240V AC, 50 to 60Hz, 7.5VA max. 

(Input range: 85 to 264V AC, 47 to 63Hz) 

  Rating 24V DC, 2.4W max. (Input range: 24V DC±10%) 

  Rating 100 to 240V DC, 8.4W max. (Input range: 85 to 264V DC) 

For Installation:

 

  The instrument is intended for indoor installation. 

  Refer to section 9 “Mounting / Demounting” to install the unit on 

a DIN rail or wall. 

  Operating environmental conditions: 

- Temperature range: -5 to 55°C 
- Humidity: 5 to 90% RH 
- Altitude up to 2000 meters 

  Do not block the vents in the instrument. 

  Be careful not to ground the minus (

) terminal of the power 

supply. 

  Use an independent grounding or alternative grounding which 

does not allow current to flow in. 

  The instrument should be installed as shown in the sketch below, 

namely, in such a position that the label on the front panel is 
readable in the right direction. 

  For effective heat dissipation, allow a space of at least 100 mm 

above and below the unit. When units are used in multiple 
stacks, they should be spaced at least 130 mm apart from each 
other. If the required minimum space is not available, take 
appropriate heat protection measures by, e.g., placing a partition 
between the units. Provide a ventilation hole or install a cooling 
fan to improve airflow. Keep adequate working space in front of 
and on both sides of the unit. 

 

Disregard of this clause may cause fatal 

harm or serious bodily injury due to fire or 

electric shock.

 

 

Disregard of this clause may cause bodily 

harm or damages to nearby objects due to 

electric shock or other accidental 

happenings.

 

 

 

  All electrical connections must be made to the terminal block of 

the socket. All connections and disconnections must be made 

with no power applied to the instrument. Otherwise, electric 

shock may result. 

  Do not disassemble or modify the instrument, and do not replace 

the power fuse. Otherwise, fire or electric shock could result. 

  Do not allow any foreign matter (metal chips, water, liquid, etc.) 

to get into the instrument. Should any foreign matter enter the 

instrument, immediately unplug the power cable, and contact 

MTT or its distributor. 

  When the instrument is used for applications that require higher 

reliability and safety, such as transportation, communication, 

power generation control and medical equipment, special 

consideration should be taken in safety design to prevent such 

equipment from malfunctioning as a whole system. 

  Do not operate the instrument in an explosive atmosphere 

containing flammable vapors, gases or dusts. Otherwise, an 

explosion may result. 

  Do not place any combustible materials in the vicinity of the 

instrument. 

  Because no power switch is provided on the instrument, the 

power supply of the instrument cannot be turned off on the 

instrument side. So, be sure to provide a power circuit breaker 

for the power source of the instrument. Note that the breaker 

should be installed in a location close to the instrument for the 

convenience of operation. And the breaker should be marked as 

a “disconnecting device” for the instrument. 

 

 

  Use the instrument within the operating conditions described in 

the published product specification. Failure to do so may cause 
fire or damage to the instrument. 

  Avoid operating the instrument in locations where extreme 

temperature changes can cause condensation. Otherwise, it 
may be damaged and malfunction. 

  Avoid operating or storing the instrument in locations where 

corrosive gases are present or chemical solvents may splash. 

  Hot-swapping may not cause immediate defects in the unit, but 

this should be avoided as far as possible. 

  For the sake of safety, installation and wiring must be performed 

by qualified personnel with expertise in electronics, electricity or 
instrumentation engineering. 

CAUTION 

 

WARNING 

 

WARNING 

 

CAUTION 

 

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