Call Us: 800-207-2259

Contacta STS-A31H-55 Window Intercom Amplifier and Power Supply Kit

$ 462.00
$ 504.00
Contacta STS-A31H-55 Window Intercom Amplifier and Power Supply Kit

The Contacta STS-A31H-55 pairs the two components installers need to run any Contacta window intercom setup: the STS-A31H open-duplex amplifier and the PS-55 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.

The 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.

The 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.

If 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.

What's in the Kit:

  • STS-A31H Window Intercom Amplifier (open duplex, matte black ABS, constant-current hearing loop drive)
  • PS-55 Power Supply (Level VI, 14V DC, 2.14A, 30W maximum, black ABS)
  • Region-specific IEC lead (6.56 feet, black PVC)

Standards and Compliance:

  • U.S. Department of Energy Level VI external power supply efficiency (PS-55)
  • UL compliant
  • RCM compliant
  • KC compliant
  • FCC compliant
  • CE (EMC) compliant
  • CCC compliant

STS-A31H Amplifier Physical Data:

  • Dimensions: 1.57" H x 4.53" W x 4.57" D
  • Weight: 0.22 lb
  • Construction: ABS plastic housing
  • Finish: matte black, fine texture

STS-A31H Amplifier Technical Data:

  • Supply voltage: 12-14 VDC via 2.1 mm DC jack
  • Quiescent current: 100 mA typical
  • Operating current: 2 A typical on speech peaks
  • Microphones: electret, 5V supply via 2.2K load resistor
  • Speaker output power: 2.5W RMS at 8 ohm / 4.4W RMS at 4 ohm
  • Hearing loop drive compliance: constant current, bounded by 4V RMS and 2A RMS
  • Total harmonic distortion: less than 5% (loop and speakers)

PS-55 Power Supply Physical Data:

  • Dimensions: 3.66" H x 1.93" W x 1.42" D
  • Weight: 0.39 lb
  • Output cable length: 5.90 feet
  • Construction: ABS plastic housing
  • Finish: black

PS-55 Power Supply Technical Data:

  • Input: 100-240V, 50-60 Hz
  • Output: 14V DC, 2.14A, 30W maximum

Frequently Asked Questions

Is shipping really free?

Yes. Free delivery is included on every safe we sell, anywhere in the lower 48 states. The specific delivery method depends on the safe's weight: small package delivery for under 150 lbs, curbside, or garage delivery for heavier safes. See full shipping details →

How long will this take to arrive?

Shipping timelines vary by product. Check the availability status at the top of this page for the estimated ship date. Once shipped, transit time typically runs 5–10 business days, depending on your location. You'll receive tracking when the safe leaves the warehouse. Safes under 150 lbs ship via UPS or FedEx Ground, no appointment needed. Safes weighing 150 lbs or more ship via freight (LTL); the freight carrier will contact you directly to schedule a delivery appointment once the safe reaches your local terminal.

Can you deliver it inside my house and bolt it down?

We don't provide inside delivery directly, but we work with third-party installers across the country who do. Here's how it works: call us at 800-207-2259 for a recommendation in your area, and we'll provide the names and phone numbers of installers we've worked with. You contact the installer directly to arrange pricing for delivery and installation. Once you've agreed on a price, place your order with us using the installer's address as the shipping destination. The installer receives the safe, inspects it, and schedules your final delivery appointment. Some installers prefer to pick the safe up directly from the freight terminal. See inside delivery details →

Will this fit through my doorway?

Check the product's exterior dimensions (listed above) against your narrowest passage, interior doorways, stair landings, and tight turns. Most people remove the safe from the pallet before moving it indoors, so the safe's actual dimensions are what matter for doorways. Standard interior doorways (30–32" clear) accommodate most residential safes, but measure before ordering. Call us if you're uncertain. See where to locate your safe →


Can I change the combination myself?

Electronic locks: yes; it takes about 30 seconds. Instructions are included with your safe. Mechanical dial locks: no, changing a dial combination requires a licensed safe technician. Important: attempting to change a dial combination yourself (or having an unlicensed locksmith do it) voids the lock warranty. A licensed safe tech maintains the warranty. See lock operating instructions →

Note: Some mechanical pushbutton locks (like Simplex) can be changed by the user without a technician. Check your specific lock's instructions.

What if it arrives damaged?

Call us immediately — while you have 24 hours to report damage, calling right away gets the claim filed faster. Take photos of the damage and packaging before moving anything. For minor cosmetic damage, we typically send touch-up paint plus a partial refund. For significant damage, we send replacement parts or arrange a full replacement. Order Protection (optional at checkout) speeds refund payouts to 48–72 hours vs. 30–60 days through standard freight claims; replacement safes ship on the manufacturer's normal timeline regardless. See receiving your safe →

What's your return policy?

We offer a 30-day return policy on unused, in-original-condition products. The return freight for a heavy safe is substantial, so we strongly encourage you to call us before ordering if you're unsure about fit or configuration. See full return policy →

Can I place my order by phone?

Yes. Call us Monday–Friday, 8am–5pm Pacific at 800-207-2259. You have two options: we can take the full order by phone (we pause the call recording before you read your card number, so payment info is never stored), or we can build your order and email you a payable invoice link so you can enter your own payment details securely.

Contacta Inc

Authorized Dealer

Model:STS-A31H-55

◐ Availability Usually Ships in 2-3 Business Days

Ships from factory warehouse. Transit time not included.

    Free Shipping
    In Stock

    Free Shipping
    In Stock
    Contacta STS-A31H-55 Window Intercom Amplifier and Power Supply Kit

    The Contacta STS-A31H-55 pairs the two components installers need to run any Contacta window intercom setup: the STS-A31H open-duplex amplifier and the PS-55 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.

    The 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.

    The 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.

    If 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.

    What's in the Kit:

    • STS-A31H Window Intercom Amplifier (open duplex, matte black ABS, constant-current hearing loop drive)
    • PS-55 Power Supply (Level VI, 14V DC, 2.14A, 30W maximum, black ABS)
    • Region-specific IEC lead (6.56 feet, black PVC)

    Standards and Compliance:

    • U.S. Department of Energy Level VI external power supply efficiency (PS-55)
    • UL compliant
    • RCM compliant
    • KC compliant
    • FCC compliant
    • CE (EMC) compliant
    • CCC compliant

    STS-A31H Amplifier Physical Data:

    • Dimensions: 1.57" H x 4.53" W x 4.57" D
    • Weight: 0.22 lb
    • Construction: ABS plastic housing
    • Finish: matte black, fine texture

    STS-A31H Amplifier Technical Data:

    • Supply voltage: 12-14 VDC via 2.1 mm DC jack
    • Quiescent current: 100 mA typical
    • Operating current: 2 A typical on speech peaks
    • Microphones: electret, 5V supply via 2.2K load resistor
    • Speaker output power: 2.5W RMS at 8 ohm / 4.4W RMS at 4 ohm
    • Hearing loop drive compliance: constant current, bounded by 4V RMS and 2A RMS
    • Total harmonic distortion: less than 5% (loop and speakers)

    PS-55 Power Supply Physical Data:

    • Dimensions: 3.66" H x 1.93" W x 1.42" D
    • Weight: 0.39 lb
    • Output cable length: 5.90 feet
    • Construction: ABS plastic housing
    • Finish: black

    PS-55 Power Supply Technical Data:

    • Input: 100-240V, 50-60 Hz
    • Output: 14V DC, 2.14A, 30W maximum

    Frequently Asked Questions

    Is shipping really free?

    Yes. Free delivery is included on every safe we sell, anywhere in the lower 48 states. The specific delivery method depends on the safe's weight: small package delivery for under 150 lbs, curbside, or garage delivery for heavier safes. See full shipping details →

    How long will this take to arrive?

    Shipping timelines vary by product. Check the availability status at the top of this page for the estimated ship date. Once shipped, transit time typically runs 5–10 business days, depending on your location. You'll receive tracking when the safe leaves the warehouse. Safes under 150 lbs ship via UPS or FedEx Ground, no appointment needed. Safes weighing 150 lbs or more ship via freight (LTL); the freight carrier will contact you directly to schedule a delivery appointment once the safe reaches your local terminal.

    Can you deliver it inside my house and bolt it down?

    We don't provide inside delivery directly, but we work with third-party installers across the country who do. Here's how it works: call us at 800-207-2259 for a recommendation in your area, and we'll provide the names and phone numbers of installers we've worked with. You contact the installer directly to arrange pricing for delivery and installation. Once you've agreed on a price, place your order with us using the installer's address as the shipping destination. The installer receives the safe, inspects it, and schedules your final delivery appointment. Some installers prefer to pick the safe up directly from the freight terminal. See inside delivery details →

    Will this fit through my doorway?

    Check the product's exterior dimensions (listed above) against your narrowest passage, interior doorways, stair landings, and tight turns. Most people remove the safe from the pallet before moving it indoors, so the safe's actual dimensions are what matter for doorways. Standard interior doorways (30–32" clear) accommodate most residential safes, but measure before ordering. Call us if you're uncertain. See where to locate your safe →


    Can I change the combination myself?

    Electronic locks: yes; it takes about 30 seconds. Instructions are included with your safe. Mechanical dial locks: no, changing a dial combination requires a licensed safe technician. Important: attempting to change a dial combination yourself (or having an unlicensed locksmith do it) voids the lock warranty. A licensed safe tech maintains the warranty. See lock operating instructions →

    Note: Some mechanical pushbutton locks (like Simplex) can be changed by the user without a technician. Check your specific lock's instructions.

    What if it arrives damaged?

    Call us immediately — while you have 24 hours to report damage, calling right away gets the claim filed faster. Take photos of the damage and packaging before moving anything. For minor cosmetic damage, we typically send touch-up paint plus a partial refund. For significant damage, we send replacement parts or arrange a full replacement. Order Protection (optional at checkout) speeds refund payouts to 48–72 hours vs. 30–60 days through standard freight claims; replacement safes ship on the manufacturer's normal timeline regardless. See receiving your safe →

    What's your return policy?

    We offer a 30-day return policy on unused, in-original-condition products. The return freight for a heavy safe is substantial, so we strongly encourage you to call us before ordering if you're unsure about fit or configuration. See full return policy →

    Can I place my order by phone?

    Yes. Call us Monday–Friday, 8am–5pm Pacific at 800-207-2259. You have two options: we can take the full order by phone (we pause the call recording before you read your card number, so payment info is never stored), or we can build your order and email you a payable invoice link so you can enter your own payment details securely.

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