Introduction; Description; Specifications; General Information - Leviton 74000 Serie Instrucciones De Instalación

Transient voltage surges are short-term deviations from a desired voltage level or signal that can
occur at any time. Such changes can result in an electronic device malfunction, or cause extensive
damage. Also termed "spikes", these occurrences take place as a result of magnetic field/inductive
coupling or whenever the line current is interrupted. They can originate from either inside a facility,
or derive from outside utility lines. Sources within a facility involve loads that are switched, such as
electric motors that are turned ON and OFF. Outside transient influences involve utility grid switching.
Leviton's High Current Surge Protective Device (SPD) Panels with counter status display and
replaceable modules are designed to provide protection for microprocessor-based equipment in
industrial and commercial establishments from high voltage transients. The front panel membrane
switch display indicates protection status of "Fault", "Alert" or "Protection". The Surge Counter display
includes a counter, amplitude measurement, the date and the time of the surge event. These events
are stored and recallable by the user.
ratings:
3 Phase, 4 Wire with Ground
• 74/75/76/77/78/79120-7M3
• 74/75/76/77/78/79277-7M3
• 74/75/76/77/78/79347-7M3
Display:
Membrane Switch
• Protection Status
• Surge Counter Status
• Controls
High Current SPD Panel:
• Green, Yellow and Red diagnostic indicator for each phase, plus N-G.
• Acoustic as well as visual indicators.
• Compatible with Decora Home Controls (DHC).
• Provided with Remote Monitoring Dry Contact. Alarm circuit/relay status contacts are rated @
5A. Voltage rating is 250 VAC/30 VDC.
• Power for this function uses 480 VAC, 200 KA IR Surge Protection fuses with LED failure
indication.
noTES:
• NEMA Type 12 enclosure with outer and inner hinged doors.
• Panels provide 7 modes of protection: L-N (3), L-G (3) and N-G (1).
• Panel terminal blocks accept up to #6 AWG wire and are rated for 600 Volts. Recommended
conductor size is #10 to #6 AWG, stranded.
• Listed to UL Standard 1499 - 2nd Edition.
• UL listed for Canada.

InTroDuCTIon

DESCrIPTIon

SPECIFICaTIonS

120/208 VAC
277/480 VAC
347/600 VAC

GEnEral InForMaTIon

Page 1