{"product_id":"3-za20b-edwards-est-20w-zoned-audio-amplifier-with-2570-vrms-output-and-nac-circuit","title":"3-ZA20B | Edwards EST 20W Zoned Audio Amplifier with 25\/70 VRMS Output and NAC Circuit","description":"\u003ch4\u003eDescription \u003c\/h4\u003e\n\u003cp data-start=\"144\" data-end=\"396\"\u003eThe Edwards™ 3-ZA20B is a 20-watt zoned audio amplifier module designed for use in EST3 fire alarm and emergency communication systems. It delivers 25 VRMS or 70 VRMS power-limited audio output and includes a supervised 24 VDC NAC circuit for visual notification appliances. Compact and software-controlled, it provides reliable voice and tone signaling in mass notification and evacuation systems.\u003c\/p\u003e\n\u003cp data-start=\"284\" data-end=\"574\" class=\"\"\u003e \u003c\/p\u003e\n\u003cp data-start=\"284\" data-end=\"574\" class=\"\"\u003e \u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications \u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEdwards \/ EST\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFlame Safety Products\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-ZA20B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubcategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFlame Safety Amplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e20 W at 25 VRMS or 70 VRMS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8-channel multiplexed digital audio\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Wiring\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eClass A or Class B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFrequency Response\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e400 Hz to 4 kHz ±3 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHarmonic Distortion\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 7%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNAC Circuit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e24 VDC, 3.5 A, Class A or Class B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEOL Resistor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15 kΩ (internal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBackup Tones\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 kHz evacuation tone, 20 SPM alert tone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWire Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12 to 18 AWG (4.0 to 1.0 mm²)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSpace Requirement\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 rail space (LRM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Source\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSystem power supply via local rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e32 °F to 120 °F (0 °C to 49 °C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelative Humidity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e93% non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEST3 cabinet, rail-mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApprovals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUL\/ULC listed (Indoor dry use)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~1.20 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eInformation About \u003cspan data-sheets-root=\"1\"\u003e3-ZA20B\u003c\/span\u003e\n\u003c\/h4\u003e\n\u003cp\u003eThe 3-ZA20B is part of the EST3 amplifier series, available in both 20 W and 40 W versions, engineered for fire alarm and mass notification applications. This module supports up to eight multiplexed digital audio channels, with integrated de-multiplexing circuitry allowing selection of live paging or stored messages via system software. Mounted in the EST3 cabinet rail chassis, it requires only one LRM space and uses removable terminal blocks for simplified field wiring. In addition to its audio output, the amplifier includes an independently controlled, supervised, and power-limited 24 VDC NAC rated at 3.5 A for strobes or other visual signaling devices. Its advanced digital processing ensures high intelligibility and compliance with life safety standards.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e20-Watt Output: Provides 20 W audio at selectable 25 VRMS or 70 VRMS.\u003c\/li\u003e\n\u003cli\u003eIntegrated NAC Circuit: Built-in 24 VDC power-limited NAC, 3.5 A, Class B or Class A.\u003c\/li\u003e\n\u003cli\u003eMulti-Channel Support: Handles up to eight multiplexed digital audio channels.\u003c\/li\u003e\n\u003cli\u003eDigital Demultiplexing: Built-in circuitry ensures accurate channel selection via software.\u003c\/li\u003e\n\u003cli\u003eNotification Redundancy: Includes 1 kHz evacuation tone and 20 SPM alert tone backup signals.\u003c\/li\u003e\n\u003cli\u003eCompact Installation: Occupies one LRM rail space within EST3 cabinets.\u003c\/li\u003e\n\u003cli\u003eSoftware Controlled: Audio channel selection and supervision managed via EST3 system software.\u003c\/li\u003e\n\u003cli\u003eField Wiring Simplicity: Removable terminal blocks for easier installation and service.\u003c\/li\u003e\n\u003cli\u003eFault Supervision: Monitors opens, shorts, and grounds on audio and NAC circuits.\u003c\/li\u003e\n\u003cli\u003eUL\/ULC Approved: Listed for fire alarm and emergency communication applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 3-ZA20B provides dependable, digitally controlled audio distribution for life safety systems.\u003c\/p\u003e","brand":"Edwards EST","offers":[{"title":"Default Title","offer_id":49105187700992,"sku":"3-ZA20B","price":1027.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0388\/5331\/2557\/files\/4e8c396683c3491285e99107c64bdb52.jpg?v=1785542167","url":"https:\/\/alotechparts.com\/products\/3-za20b-edwards-est-20w-zoned-audio-amplifier-with-2570-vrms-output-and-nac-circuit","provider":"Alo Tech Solutions","version":"1.0","type":"link"}