KATKO switches are named according to the number of poles and AC-22 690V ratings of the switch. For example, KER 340 enclosed switch has 3 poles and it's AC-22 690V rating is 40 amps. First part of type name of enclosed switches comes from the material of enclosure. KEM is for plastic, KET is for sheet steel, KER is for stainless steel, and KEA for aluminium.
Due to the varying nature of AC and DC different techniques must be used to safely disconnect the current. AC’s “zero crossing” interrupts current flow and is therefore relatively easy to break. DC, on the other hand, has no such characteristic and thus the arc tends to be longer and requires special blow-out coils or magnets to stretch and break the current. It is essential to use a right solution, and special attention should be focused on systems that operate with both currents, such as photovoltaics.
Katko's FR switches are designed to conform to F200 class of EN 12101-3 smoke and heat standard. This requires that the switch remains operational in 200° C for 120 minutes (switch remains operational for 180 minutes). Katko's FR3 switches conform to class F300, which requires the switch to remain operational for 60 minutes in 300° C (switch remains operational for 120 minutes).
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