What component can be used in an AC circuit to handle noise surges effectively in conjunction with an SSR?

Utilizing varistors in an AC circuit alongside a Solid State Relay (SSR) is an effective measure for managing voltage surges and minimizing noise. Varistors are voltage-dependent resistors that change resistance based on the applied voltage. When a surge occurs, their resistance decreases, allowing the excess voltage to be diverted away from sensitive components within the circuit. This helps to protect the SSR and other connected devices from potential damage caused by transient voltage spikes.

In contrast, while capacitors can store energy and filter out noise, they are not specifically designed to handle voltage surges in the way that varistors are. Transformers are primarily used for voltage conversion rather than surge protection, and inductors can filter out high-frequency noise but do not effectively address voltage spikes. Therefore, the role of varistors in this scenario is critical for ensuring circuit resilience against noise and transients.