{"product_id":"3-za20a-edwards-20w-zoned-amplifier-2570-vrms-class-ab-audio-24vdc-nac","title":"3-ZA20A | Edwards 20W Zoned Amplifier, 25\/70 VRMS, Class A\/B Audio \u0026 24VDC NAC","description":"\u003ch4\u003eDescription \u003c\/h4\u003e\n\u003cp data-end=\"396\" data-start=\"144\"\u003eThe Edwards 3-ZA20A is a 20-watt zoned amplifier module designed for EST3 fire alarm and emergency communication systems. It delivers supervised Class A or Class B audio output at 25 VRMS or 70 VRMS for distributed speaker circuits. The 3-ZA20A also includes an integrated 24 VDC, 3.5 A Notification Appliance Circuit (NAC) for visual signaling devices.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"574\" data-start=\"284\"\u003e \u003c\/p\u003e\n\u003cp class=\"\" data-end=\"574\" data-start=\"284\"\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\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-ZA20A\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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAudio Output Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSelectable 25 VRMS or 70 VRMS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAudio Circuit 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\u003eNAC Circuit Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e24 VDC nominal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNAC Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.5 A maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDigital Audio Input\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8-channel multiplexed, demultiplexed on board\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 at ±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\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\u003eCurrent (Standby)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e62 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCurrent (Alarm)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.12 A\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\u003eModule Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 LRM space\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\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\u003eHumidity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 93% RH, non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAgency Listings\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUL\/ULC approved\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.00 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-ZA20A\u003c\/span\u003e\n\u003c\/h4\u003e\n\u003cp\u003eThe 3-ZA20A is part of the EST3 family of audio amplifiers, engineered to support mass notification and evacuation applications. The unit integrates demultiplexing circuitry, allowing it to select and output one of eight multiplexed digital audio channels distributed across the system. Designed for flexibility, the 3-ZA20A supports Class A (Style 7) and Class B (Style 4) wiring configurations for both speaker circuits and the NAC. Mounted in one LRM space, the amplifier operates directly from system power supplies via the local rail and connects through removable terminal blocks for simplified installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e20-Watt Audio Output: Provides reliable power for small to medium speaker circuits.\u003c\/li\u003e\n\u003cli\u003eSelectable 25\/70 VRMS: Compatible with both standard speaker voltages in fire alarm and MNEC systems.\u003c\/li\u003e\n\u003cli\u003eClass A\/B Audio Circuits: Supports either Class A or Class B wiring for flexibility in system design.\u003c\/li\u003e\n\u003cli\u003eIntegrated NAC: Built-in 24 VDC NAC rated at 3.5 A for visual notification devices.\u003c\/li\u003e\n\u003cli\u003eDigital Audio Integration: Demultiplexing circuitry allows channel selection from up to eight digital audio inputs.\u003c\/li\u003e\n\u003cli\u003eSoftware Controlled: Network-based configuration enables easy channel assignment and monitoring.\u003c\/li\u003e\n\u003cli\u003eRemovable Terminals: Simplifies field wiring and troubleshooting.\u003c\/li\u003e\n\u003cli\u003eCompact Design: Requires only one rail space for efficient use of enclosure space.\u003c\/li\u003e\n\u003cli\u003eLow Distortion: Frequency response of 400 Hz to 4 kHz with \u0026lt;7% harmonic distortion ensures intelligible voice audio.\u003c\/li\u003e\n\u003cli\u003eUL\/ULC Listed: Certified for use in fire alarm and emergency communication systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 3-ZA20A delivers the reliability and performance needed for high-quality voice and signal amplification in Edwards EST3 life safety systems.\u003c\/p\u003e","brand":"Edwards","offers":[{"title":"Default Title","offer_id":49105186521344,"sku":"3-ZA20A","price":1183.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0388\/5331\/2557\/files\/s-l1600_d0a776c5-50f6-440c-a54d-a231a7e9ff2a.webp?v=1785542131","url":"https:\/\/alotechparts.com\/products\/3-za20a-edwards-20w-zoned-amplifier-2570-vrms-class-ab-audio-24vdc-nac","provider":"Alo Tech Solutions","version":"1.0","type":"link"}