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What do switch ratings mean?
The voltage rating is a function of a switch’s ability to suppress the internal arc that occurs when a switch’s contacts open. So, in the example below the maximum amp rating for this switch at 250 volts AC (VAC) is 10 amps; the maximum amp rating at 125 volts AC for the same switch is 15 amps.
What is at rated switch used for?
A T-rated switch is a switch rated in accordance with the national electric code for use in circuits containing tungsten filament lamps.
What is the rating of switches used in house wiring?
The double-pole switch is commonly used in industrial applications but can be found in some home wiring systems. Double-pole switches are commonly rated for 30 amps, compared to 15 amps or 20 amps with standard switches.
What is the most important characteristic of how switches are rated?
Switch Rating. Switches are rated according to their electrical characteristics. The rating of a switch is determined by such factors as contact size, contact material, and contact spacing. There are two basic parts to a switch rating-the current and voltage rating.
What is the current rating of a switch?
Generally, most switch applications can be classified into one of the below load categories. Switch capacities can be mathemati- cally rerated when the application calls for a category or voltage other than the switch standard general specification ratings, meaning original current ratings at 125V AC.
What does the Arc rating on a switch mean?
The VA may be a reactive load but the arc is a real power drop in the switch which rises during turn-off before quenched to off state. Simple Voltage rating depends on gaps. Current ratings depends on material, pressure , contact resistance and lifetime testing.
Which is better a DC or AC switch?
These peak fluctuations in current and voltage are important when choosing your switch. If the electrical ratings aren’t suitable, either your switch will fail immediately, or you will considerably shorten the life of the switch. For the same current rating, the dc voltage rating on a switch will generally be much lower than its ac voltage rating.
When to use dual rated power level switches?
Electrical Ratings The dual rated option is suitable where identical switches are used in both a logic and a power level circuit within the same application. Dual rated switches enable the user to install the same switch in both a logic level (dry circuit) and a power level circuit. However, once a code “A” rated contact