Clamping Voltage: Select a varistor with a clamping voltage that is below the maximum voltage the SPD is expected to encounter.
Energy Absorption: Select a varistor with an energy absorption rating that meets or exceeds the level of protection required.
Response Time: Choose a varistor with a response time that is fast enough to protect against high surge currents.
Size: Choose a varistor with a size that fits well with the SPD design and does not interfere with other components.
Varistors are an important component in surge protection systems, as they help to absorb and divert excess electrical energy away from sensitive electronic devices and circuits. A varistor is a semiconductor device that acts as a voltage-dependent resistor, meaning that its resistance changes with voltage, and can be used to protect against large voltage spikes, or transients. When a varistor is placed across the power supply line of a circuit, it acts as a 'clamp', limiting the voltage to a safe level and reducing the risk of a surge or spike damaging the circuit. Varistors can also be used in surge protection circuits to divert the excessive energy away from the protected device and prevent damage to it.
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