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Guide to installation and assistance
Thank you for choosing the OVRHMSU Surge Protective Device
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(SPD). We look forward to fulfilling your facility wide surge
protection needs.
Install the 2 Port OVRHMSU electrically in series between the
AC electrical power source and the load to be protected.
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WARNING
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HAZARDOUS VOLTAGES PRESENT: The following is intended
for qualified electrical personnel only. Completely read these
instructions before installation. It is the final responsibility
of the installing electrician to ensure that all local codes and
other applicable safety/ environmental conditions are met
and the unit is correctly installed.
WARNING
IMPORTANT SAFETY INSTRUCTIONS: Serious injury or
damage may result from installing a product with an
improper voltage rating.
OV R H M S U S E R I E S S P D S
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Pre-installation checklist
Confirm that the voltage rating(s) of the intended
OVRHMSU match those of the electrical system
or circuit to which the product is to be installed.
Verify that the intended load does not exceed
24 RMS amperes.
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Table 1b: Operating voltage ranges
Model number
MSU50-120-1G-24A-3
MSU50-220-1G-24A-3
MSU50-227-1G-24A-3
Model number
MSU50-120/240-2G-24A-6
MSU50-220/380-2G-24A-6
MSU50-227/480-2G-24A-6
The Two-Port OVRHMSU series SPD is provided with a Power
ON indicator. When power is applied to the OVRHMSU series
SPD, the Power ON indicator will illuminate. When power is
removed from the OVRHMSU series SPD, the Power ON
indicator will extinguish.
The OVRHMSU series is intended to installed and operated in
an ambient environment that does not exceed 104°F (+40°C),
and does not contain conductive liquids or combustible dusts,
fibers, vapors, or liquids. The environment should also
maintain a humidity range of 5% – 95% (non-condensing).
The OVRHMSU series is intended to be stored in a dry location
where the temperature range does not exceed -40°F to +140°F
(-40°C to +60°C).
Nominal voltages (L-N)
120
220
277
Nominal voltages (L-N/L-L)
120/240
220/380
277/480
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