P/N: 80928 Rev. 1 08/14/09
SolaHD STV 25 K DIN Rail Series Instruction Manual
1.0 Introduction
e SolaHD STV 25K DIN Rail Series Surge Protective Device is a high quality, transient diversion system designed to protect sensitive equipment
from damaging transient voltage surges resulting from load switching, lightning strikes and other sources.
e installer should perform the following steps to assure a quality installation. Please read all instructions before starting the installation of this
product. ese instructions do not replace national or local electrical codes—check applicable codes to ensure compliance.
2.0 Installation
DANGER!
Only qualied personnel should install or service this system. Electrical safety precautions must be followed when installing or servicing this equipment. To prevent
risk of electrical shock, turn o and lock out all power sources before making electrical connections or servicing.
2.1 Environment
For use indoors, in an ambient temperature of -40ºC to +50ºC, with a relative humidity 0% to 95% (non-condensing).
2.2 Maximum Current Capability
e total current draw which the STV 25K may continuously handle is 20 A. Overloading the unit can permanently damage the device.
2.3 Recommended Fuse
Bussman type SC-25 class G, rated 250 V ac minimum; 25 A maximum or equivalent.
2.4 Nominal Voltage
e maximum continuous operating voltage (MCOV) for model STV 25K-10S is 150 V ac and the MCOV for model STV 25K-24S is 275 V ac.
Failure to use the unit at its rated voltage can permanently damage the unit or provide inadequate surge protection.
2.5 Supplemental Enclosures
e STV 25K must be installed inside an enclosure and located to prevent accidental contact with terminals during maintenance or servicing.
2.6 Summary Alarm Contacts
Summary alarm Form C (1 N.O. and 1 N.C.) relay contacts rated 125 V ac, 5 A max. are provided for remote indication of protection status.
Connections may be made to these terminals on the unit using #18 AWG conductors.
2.7 Conductor Size
e conductor size to the input and output of the STV 25K ranges from #14 AWG to #10 AWG.
2.8 Grounding
Input and output ground terminals must be connected for proper operation. is grounding is not only required for safety, but also for equipment
performance. Incorrect grounding can reduce or impede the operation of the unit.
3.0 Product Ratings & Limitations
3.1 Voltage Protection Ratings
To obtain the voltage protection ratings (VPR), as obtained by Underwriters Laboratory, Incorporated, in accordance with the Standard for Safety,
Surge Protective Devices, Standard 1449, ird Edition, dated September 29, 2006, marked on this product, #12 AWG wire must be utilized to
connect the STV 25K to your protected load. Connections made with conductors other that #12 AWG may result in dierent voltage protection
ratings.
4.0 Operation
4.1 Wiring Connections
Before making connections to the unit, verify that the unit model number and nameplate voltage rating are appropriate for connection to the
intended power source. See Table 1 on page 2 for voltage rating applications with typical power source congurations.
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