Why are safety capacitors not suitable for RC step-down circuits?

一沙一世

Why are safety capacitors not suitable for RC step-down circuits? [Copy link]

Why are safety capacitors not suitable for RC step-down circuits?

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Polypropylene CBB is generally used in RC circuits.

X safety capacitors are also polypropylene capacitors, which should be OK as long as they meet the parameter requirements of the RC circuit.

Y safety capacitors do not seem to be suitable

damiaa

Safety capacitors are also used in RC step-down circuits, but not in the RC step-down part. RC step-down capacitors are usually dedicated. You can search for RC step-down capacitors.

The capacitors used for RC voltage reduction are generally AC capacitors with an AC withstand voltage of more than 400V. They are non-polar capacitors with a capacity ranging from a few microfarads to 1-2 microfarads. Polyester metal film capacitors are commonly used.

The circuit of RC voltage reduction can only be used for very small power AC to low voltage DC circuit. It is mainly for saving money.

maychang

Safety capacitors can be used in RC step-down circuits without any problems.

But can you afford the price of safety capacitors? The purpose of reducing voltage by using resistors and capacitors is to save a little cost. Why do you use more expensive safety capacitors?

chunyang

1. The capacity of safety capacitors is usually low.

2. The price of safety capacitors is higher than that of non-safety capacitors of the same specifications, especially those with larger capacity.

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The purpose of using RC to reduce voltage is to save money! Safety capacitors are relatively expensive.