Lighting relay panel features for improved safety and reliability

A protection circuit, comprising:

• a first varistor configured for connection to an AC power source, wherein a first connector of the first varistor is configured for connection to a hot connection of the AC power source and a second connector of the first varistor is configured for connection to a neutral connection of the AC power source, and the first and second connectors of the first varistor are configured for connection to inputs of an EMI filter;
• a second varistor configured for connection to a rectifier, wherein a first connector of the second varistor is configured for connection to a hot connection of the rectifier and a second connector of the second varistor is configured for connection to a neutral connection of the rectifier, and the first and second connectors of the second varistor are configured for connection to outputs of the EMI filter;
• and
• a third varistor configured for connection to the AC power source, wherein a first connector of the third varistor is configured for connection to the neutral connection of the AC power source and second connector of the third varistor is configured for connection to a ground connection,
• wherein the second connector of the first varistor is connected to the first connector of the third varistor at a connection point of (i) the neutral connection of the AC power source and (ii) one of the inputs to the EMI filter.