{"product_id":"contacta-sts-a31h-55-window-intercom-amplifier-and-power-supply-kit","title":"Contacta STS-A31H-55 Window Intercom Amplifier and Power Supply Kit","description":"\u003ccenter\u003e\u003cspan style=\"font-size: x-large;\"\u003e\u003cstrong\u003eContacta STS-A31H-55 Window Intercom Amplifier and Power Supply Kit\u003c\/strong\u003e\u003c\/span\u003e\u003c\/center\u003e\n\u003cp\u003eThe Contacta STS-A31H-55 pairs the two components installers need to run any Contacta window intercom setup: the \u003ca href=\"https:\/\/www.safeandvaultstore.com\/products\/contacta-sts-a31h-window-intercom-amplifier\" rel=\"noopener\" target=\"_blank\"\u003eSTS-A31H\u003c\/a\u003e open-duplex amplifier and the \u003ca href=\"https:\/\/www.safeandvaultstore.com\/products\/contacta-ps-55-power-supply\" rel=\"noopener\" target=\"_blank\"\u003ePS-55\u003c\/a\u003e Level VI power supply. This is the correct order when you are building a custom Contacta window intercom installation from staff-side and customer-side hardware you already have, or when you need to replace both the amplifier and the power supply on an existing installation at the same time. Ordering the pair as the STS-A31H-55 kit is faster than sourcing the two SKUs separately and guarantees the matched power supply that Contacta specifies for the STS-A31H.\u003c\/p\u003e\n\u003cp\u003eThe STS-A31H amplifier provides full open-duplex communication, so both parties can speak at the same time without the clipped, walkie-talkie feel of half-duplex systems. It drives Contacta's window intercom customer-side and staff-side hardware, and its constant-current hearing loop drive with an engineer-adjustable level powers an IL-AE98 or IL-AE99 hearing loop aerial so customers with hearing aids in the T-coil position can pick up the audio directly. The amplifier's energy-saving green standby mode is engaged automatically, cutting power draw by up to 80% during periods with no active speech, and continuous self-testing means no specialized equipment is required to confirm functionality after installation.\u003c\/p\u003e\n\u003cp\u003eThe PS-55 is the Level VI matched power supply for the STS-A31H. It outputs 14 volts DC at up to 2.14 amps (30 watts maximum) through a 5.90-foot output cable that terminates in a barrel connector to the amplifier. The kit includes a region-specific IEC lead (6.56 feet, black PVC) for the wall-side connection, so it plugs into any standard grounded outlet in the region where it is sold. Universal 100 to 240 volt AC input at 50 or 60 hertz means the PS-55 itself is a global unit; only the IEC lead is region-specific.\u003c\/p\u003e\n\u003cp\u003eIf you're not sure whether the STS-A31H-55 kit is the right order for your installation, or you need help identifying which components you already have and which ones you still need, please call us at 800-207-2259.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's in the Kit:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSTS-A31H Window Intercom Amplifier (open duplex, matte black ABS, constant-current hearing loop drive)\u003c\/li\u003e\n\u003cli\u003ePS-55 Power Supply (Level VI, 14V DC, 2.14A, 30W maximum, black ABS)\u003c\/li\u003e\n\u003cli\u003eRegion-specific IEC lead (6.56 feet, black PVC)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eStandards and Compliance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eU.S. Department of Energy Level VI external power supply efficiency (PS-55)\u003c\/li\u003e\n\u003cli\u003eUL compliant\u003c\/li\u003e\n\u003cli\u003eRCM compliant\u003c\/li\u003e\n\u003cli\u003eKC compliant\u003c\/li\u003e\n\u003cli\u003eFCC compliant\u003c\/li\u003e\n\u003cli\u003eCE (EMC) compliant\u003c\/li\u003e\n\u003cli\u003eCCC compliant\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSTS-A31H Amplifier Physical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDimensions: 1.57\" H x 4.53\" W x 4.57\" D\u003c\/li\u003e\n\u003cli\u003eWeight: 0.22 lb\u003c\/li\u003e\n\u003cli\u003eConstruction: ABS plastic housing\u003c\/li\u003e\n\u003cli\u003eFinish: matte black, fine texture\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSTS-A31H Amplifier Technical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSupply voltage: 12-14 VDC via 2.1 mm DC jack\u003c\/li\u003e\n\u003cli\u003eQuiescent current: 100 mA typical\u003c\/li\u003e\n\u003cli\u003eOperating current: 2 A typical on speech peaks\u003c\/li\u003e\n\u003cli\u003eMicrophones: electret, 5V supply via 2.2K load resistor\u003c\/li\u003e\n\u003cli\u003eSpeaker output power: 2.5W RMS at 8 ohm \/ 4.4W RMS at 4 ohm\u003c\/li\u003e\n\u003cli\u003eHearing loop drive compliance: constant current, bounded by 4V RMS and 2A RMS\u003c\/li\u003e\n\u003cli\u003eTotal harmonic distortion: less than 5% (loop and speakers)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePS-55 Power Supply Physical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDimensions: 3.66\" H x 1.93\" W x 1.42\" D\u003c\/li\u003e\n\u003cli\u003eWeight: 0.39 lb\u003c\/li\u003e\n\u003cli\u003eOutput cable length: 5.90 feet\u003c\/li\u003e\n\u003cli\u003eConstruction: ABS plastic housing\u003c\/li\u003e\n\u003cli\u003eFinish: black\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePS-55 Power Supply Technical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInput: 100-240V, 50-60 Hz\u003c\/li\u003e\n\u003cli\u003eOutput: 14V DC, 2.14A, 30W maximum\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Contacta Inc","offers":[{"title":"Default Title","offer_id":41691361280058,"sku":"STS-A31H-55","price":462.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1147\/6518\/files\/STS-A31H-1.jpg?v=1790134986","url":"https:\/\/www.safeandvaultstore.com\/products\/contacta-sts-a31h-55-window-intercom-amplifier-and-power-supply-kit","provider":"Safe and Vault Store.com","version":"1.0","type":"link"}