ESL 405-05 Polarity Reversal Relay Module (8.5-22V DC)
$35.00
The ESL 405-05 Polarity Reversal Relay Module (8.5-22V DC) is designed for use with 4-Wire 500N Series Smoke Detectors that have built-in sounders. On alarm, the module disconnects the detectors from their normal power supply and applies reverse polarity from the notification appliance circuit. Applying reverse polarity causes the sounders on detectors not in alarm to activate.
