{"product_id":"simplex-566-520a-amplifier-circuit-board-nac","title":"SIMPLEX 566-520A Amplifier Circuit Board NAC","description":"\u003cdiv\u003e\u003cp\u003eSIMPLEX 566-520A Amplifier Circuit Board NAC is a 100-watt analog NAC amplifier module used inside Simplex 4100-series fire alarm panels to drive notification appliance circuits. Sold as an Amp PC Board Only, it is part of the family that includes 566-521A and is designed to provide multiple Class B NAC outputs with constant supervision. In official Simplex service literature, the related 566-521 variant is described as an Analog 100-Watt Amplifier with six Class B NACs and constant supervision, indicating the 566 family supports multi-NAC configurations. Catalog entries show power configurations such as 120 VAC input with 25 V RMS NAC outputs, as well as variants for 70 V RMS and Canada-specific 25 V RMS setups, all intended to integrate with Simplex power supplies and NAC wiring.\u003c\/p\u003e\u003c\/div\u003e","brand":"Simplex","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":46267979694314,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0716\/8039\/3450\/files\/GTG-STOCK-016.png?v=1788727429","url":"https:\/\/gtghardware.com\/products\/simplex-566-520a-amplifier-circuit-board-nac","provider":"GTG Hardware","version":"1.0","type":"link"}