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Smoke Alarm · 120V AC Hardwired with Battery Backup · Dual Sensor Photoelectric/Ionization · BRK 3120BA
SKU: 3120BA
120V AC hardwired smoke alarm with dual photoelectric and ionization sensing plus battery backup for continued operation during power loss. Commonly used in interconnected residential smoke alarm systems where both smouldering and fast-flaming fire detection are required.
What this product is for
This hardwired smoke alarm is used for residential fire detection on 120V AC circuits with battery backup. It combines photoelectric and ionization sensing in one unit to help detect both slow-smouldering and fast-flaming fire conditions.
Use for
Use for house, condo, apartment and similar residential smoke alarm replacement or new installation where a 120V AC interconnected alarm is required. Suitable where electricians want one alarm type that covers both common smoke detection methods in a single device.
Avoid for
Avoid using this as a substitute for a CO alarm, heat alarm or commercial fire alarm system detector. Do not use where the installation requires a different voltage, a sealed 10-year battery model, or a standalone battery-only alarm.
Best for
Best for residential hardwired smoke alarm systems needing dual-sensor detection, battery backup and interconnect capability. A practical choice for replacements where BRK/First Alert style hardwired alarms are already installed.
Installed in
Typically installed on ceilings or high on walls in bedrooms, hallways and living areas in accordance with the manufacturer instructions and local electrical and fire code requirements in Canada.
Why this product exists
This model exists for applications where a single alarm is preferred over choosing only photoelectric or only ionization sensing. Battery backup keeps the alarm active during a power outage, and interconnect capability is commonly used so that when one alarm activates, connected alarms sound throughout the dwelling.
Compared with similar products
Compared with single-sensor hardwired smoke alarms, this dual-sensor model is selected when broader smoke detection coverage is preferred. Compared with battery-only alarms, a 120V hardwired unit is typically chosen for permanent residential installations. As a rule of thumb, interconnected alarms improve whole-home notification, but actual system performance depends on wiring layout, device compatibility and local code requirements.
Specifications
- Brand: BRK
- Manufacturer part number: 3120BA
- Product type: Hardwired smoke alarm
- Power source: 120V AC, 60 Hz
- Backup power: 3V battery backup using two AA batteries
- Sensing technology: Dual sensor, photoelectric and ionization
- Interconnectable: Yes
- Audible alarm: 85 dB
- Typical application: Residential smoke alarm systems
- Mounting: Ceiling or wall, per manufacturer instructions
Trade note: For dwelling units, interconnected hardwired alarms are commonly used to improve occupant notification across multiple rooms and floors. Actual installation requirements depend on the applicable code, alarm locations and existing wiring.
- Volts120V
- TypeSmoke Detector - Ionization & Photoelectric
- Battery BackupAA
- BrandBRK Electronics
- Warranty5 year
Minimum Order $20
We accept the following payment methods:
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Standard Shipping-Free on orders over $500 in Metropolitan Areas / Subject to $750 in Rural Areas.
Minimum Order Is $20
Freight Surcharge Apply To Oversized/Over-Weight Items(Not Limited To):
- PVC and EMT Pipe
- Wire and Cable
- Items over 48 inches in length
Surcharges are applied to items on an individual basis regardless if the rest of the order meets prepaid levels. If a freight line appears at the time of check out it only applies to the Items carrying a surcharge and not the entire basket of goods.
Shipping Options:
- A courier can deliver to your home, office, or your job site
- Pick up at local depot near you (applies to the following locations)
Edmonton Warehouse 8135 Roper Rd Edmonton, T6E 6S4, AB
Orders are typically delivered within two to eleven business days. The transit time begins the first full shipping day after your order leaves our warehouse. Please allow an additional 2-5 days for delivery to remote locations, additional fees may apply.
THE FOLLOWING APPLIES TO STANDARD SHIPPING OPTIONS
- We cannot deliver to P.O. boxes.
- A signature may be required for shipments over $500.
- No weekend delivery.
- Wire & cable, EMT or PVC conduit, tube lamps 4ft or greater, and 10ft ground rods & mast pipes have special conditions.
Standard Shipping cost on orders less than $499
Total shipping cost = "Per Shipment" cost + "Per Item" cost. The "per item" cost is listed in terms of price per pound.
Product Group | Per Shipment* | Per Item |
|---|---|---|
Boxes | $6.99 | $1.49/lb |
Conduit & Raceway | $149.99 | $2.49/lb |
Connectors & Fittings | $5.99 | $1.19/lb |
Data & Structured Home | $5.99 | $1.19/lb |
Distribution Equipment | $5.99 | $1.19/lb |
Emergency Lighting | $6.99 | $1.49/lb |
Heating & Ventilation | $6.99 | $1.49/lb |
Lighting Controls | $5.99 | $1.19/lb |
Lighting Indoor | $6.99 | $1.49/lb |
Lighting Outdoor | $6.99 | $1.49/lb |
Tools | $4.99 | $.99/lb |
Wire & Cable | $49.99 | $2.29/lb |
Wiring Devices | $5.99 | $1.19/lb |
Any combination of the above items | Highest applicable per-shipment charge | As above |
Effective Date: August, 15, 1998(Updated August 2026)
At Evolt Electrical Supply, customer satisfaction is our top priority. Please review our return policy below:
Returns
Defective Items:
- If you receive a defective item, you may return it for a replacement or refund within 30 days of purchase.
- To initiate a return, please contact our customer service team with your order number and a description of the defect.
Non-Defective Items:
- We do not accept returns for non-defective items. All sales are final once the product is shipped or ordered from the manufacturer. In certain circumstances we may amend this so feel free to contact our customer service team.
Return Process
Authorization:
- Before returning any items, you must obtain a Return Merchandise Authorization (RMA) number from our customer service team. Returns without an RMA number will not be accepted.
- Backordered items can not be cancelled if the item is in transit from the manufacturer, contact us to review.
Shipping:
- Customers are responsible for the return shipping costs. We recommend using a trackable shipping service or purchasing shipping insurance.
Condition:
- Returned items must be in their original packaging and condition. Any items returned damaged due to improper packaging or misuse will not be eligible for a refund or replacement.
Refunds
- Once we receive and inspect your returned item, we will notify you of the approval or rejection of your refund.
- Approved refunds will be processed within [7] business days and a credit will automatically be applied to your original method of payment.
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