Lightning Arrestors

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MERRILL SURGE PROTECTORS

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Compare Merrill surge protectors using the details that matter most for your application.

Choose by: Duty Level Terminal Lug Voltage Install Location
Choose up to 3 Models 3 of 3 selected

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Comparison of four Merrill single-phase lightning arrestor models
Product
ECONOMY Merrill LA500 economy lightning arrestor

LA500 / LA500HV

Economy Lightning Arrestor

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ECONOMY + TERMINAL LUG Merrill LAT500 economy lightning arrestor with terminal lugs

LAT500 / LAT500HV

Economy Lightning Arrestor

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HEAVY-DUTY Merrill LAHD550 heavy-duty lightning arrestor

LAHD550 / LAHD550HV

Heavy-Duty Lightning Arrestor

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HEAVY-DUTY + TERMINAL LUG Merrill LAHDT550 heavy-duty lightning arrestor with terminal lugs

LAHDT550 / LAHDT550HV

Heavy-Duty Lightning Arrestor

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Why Choose It? Lowest-cost choice for standard single-phase surge protection. Choose when you want economy protection plus terminal-lug convenience. Choose when you need more secure panel attachment and a more robust setup. Best when you want heavy-duty construction plus terminal-lug convenience.
Best For? Basic well pump controls and economical water system protection. Installations where terminal-lug connection is preferred. Demanding installs and panel-mounted applications. Higher-demand installations needing secure mounting and terminal-lug connection.
What You Get? Economy arrestor for 120/240-volt single-phase systems. Economy arrestor with terminal lug for 120/240-volt single-phase systems. Heavy-duty arrestor for 120/240-volt single-phase systems. Heavy-duty arrestor with terminal lug for 120/240-volt single-phase systems.
Voltage Available for systems below 300V or below 600V. Available for systems below 300V or below 600V. Available for systems below 300V or below 600V. Available for systems below 300V or below 600V.
Install Location Pressure switch, control box, or both. Pressure switch, control box, or both. Pressure switch, control box, or both. Pressure switch, control box, or both.
Mounting / Connection Standard economy design without terminal lug. Terminal lug included for easier connection. Threads and nut for secure attachment to an electrical panel. Threads and nut for panel attachment plus terminal lug included.

If only one arrestor is used, the pressure switch location offers economical water system protection.

For surges above 300 or 600 volts, high voltage is directed to the ground wire.