--- product_id: 160879622 title: "Tjernlund PS1503P Plug-in Air Pressure Activation Switch for Duct Fans in Central Heating and Air Conditioning Systems" brand: "tjernlund" price: "S$200" currency: SGD in_stock: true category: "Tjernlund" url: https://www.desertcart.sg/products/160879622-tjernlund-ps1503p-plug-in-air-pressure-activation-switch-for-duct store_origin: SG region: Singapore --- # 120V automatic activation Plug-in easy installation Durable copper/brass/silver contacts Tjernlund PS1503P Plug-in Air Pressure Activation Switch for Duct Fans in Central Heating and Air Conditioning Systems **Brand:** tjernlund **Price:** S$200 **Availability:** ✅ In Stock ## Summary > ⚡ Elevate your HVAC game with effortless, smart airflow control! ## Quick Answers - **What is this?** Tjernlund PS1503P Plug-in Air Pressure Activation Switch for Duct Fans in Central Heating and Air Conditioning Systems by tjernlund - **How much does it cost?** S$200 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/160879622-tjernlund-ps1503p-plug-in-air-pressure-activation-switch-for-duct) ## Best For - tjernlund enthusiasts ## Why This Product - Trusted tjernlund brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Last:** Robust copper, brass, and silver contacts ensure reliable performance backed by 81 years of family craftsmanship. - • **Plug & Play Simplicity:** Hassle-free plug-in design means zero wiring headaches—get up and running in minutes. - • **Smart Pressure Sensing:** Diaphragm-based pressure probe triggers devices only when airflow is detected—no wasted energy. - • **Universal Compatibility:** Works flawlessly with any brand duct fan, including Tjernlund’s own boosters. - • **Seamless Auto Activation:** Automatically powers duct fans with furnace or AC blower for effortless climate control. ## Overview The Tjernlund PS1503P is a plug-in air pressure activation switch designed to automatically control duct fans and other HVAC devices by sensing positive air pressure from your furnace or air conditioner blower. Featuring a durable diaphragm pressure probe and high-quality copper, brass, and silver contacts, it offers universal compatibility and easy installation. Manufactured in the USA by a trusted 81-year-old family business, this switch ensures efficient, reliable operation and energy savings in central heating and cooling systems. ## Description The Tjernlund Duct Airstat senses positive pressure in a forced air heating and/or cooling system. The single pole, single throw, snap-acting switch is activated by a diaphragm with integral pressure probe inserted directly into the duct or plenum. The Duct Airstat can be used to initiate such auxiliary devices as: Duct Boosters, Electronic Air Cleaners, Electrical Duct Heaters, and Humidifiers. The electrical contacts of the switch are closed upon sensing positive air pressure generated by the blower. ## Features - Air pressure activation switch automatically turns on and off any device, but in particular it turns duct fans on and off based on the furnace and/or air conditioner blower coming on. - Works with any brand duct fan, including Tjernlund Duct Booster Fans. - Choose either simple black-to-black, white-to-white wiring (PS1503) or plug-in version (PS1503P). - Fool-Proof Tech: simple bladder fills and allows power to flow to the fan, so no errors from over engineered circuit boards. - Manufactured in the USA and backed by a 81-year-old family business. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07W7LTY35 | | Actuator Type | Push Button | | Best Sellers Rank | #222,819 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #74 in HVAC Controls | | Brand Name | Tjernlund | | Circuit Type | 1-way | | Color | black | | Compatible Devices | Duct Fans, Duct Boosters, Air Cleaners, Duct Heaters, Humidifiers | | Connectivity Protocol | X-10 | | Connector Type | Plug In | | Contact Material | Copper Or Brass Or Silver | | Contact Type | Normally Open | | Control Method | Touch | | Control Type | Automatic | | Current Rating | 2 A | | Customer Reviews | 4.2 4.2 out of 5 stars (203) | | Global Trade Identification Number | 00080956961532 | | Included Components | Tjernlund PS1503P Plug-in Air Pressure Activation Switch | | International Protection Rating | IP00 | | Item Dimensions | 6.81 x 6.38 x 6.34 inches | | Item Weight | 0.27 g | | Manufacturer | Tjernlund | | Material Type | Copper, Brass, Silver | | Model | B07W7LTY35 | | Mounting Type | Snap In Mount | | Number of Items | 1 | | Number of Positions | 1 | | Operating Voltage | 120 volts | | Operation Mode | Automatically,Off | | Part Number | PS1503P | | Switch Type | Flow Switch, Pressure Switch | | Terminal | Plug in | | UPC | 080956961532 | | Unit Count | 1 Count | | Wattage | 5 watts | ## Product Details - **Brand:** Tjernlund - **Connector Type:** Plug In - **Contact Type:** Normally Open - **Current Rating:** 2 A - **Item dimensions L x W x H:** 6.81 x 6.38 x 6.34 inches - **Material:** Copper, Brass, Silver - **Operating Voltage:** 120 volts - **Operation Mode:** Automatically,Off - **Switch Type:** Flow Switch, Pressure Switch - **Terminal:** Plug in ## Images ![Tjernlund PS1503P Plug-in Air Pressure Activation Switch for Duct Fans in Central Heating and Air Conditioning Systems - Image 1](https://m.media-amazon.com/images/I/31zfdYGgyaL.jpg) ![Tjernlund PS1503P Plug-in Air Pressure Activation Switch for Duct Fans in Central Heating and Air Conditioning Systems - Image 2](https://m.media-amazon.com/images/I/41jh4NCZeEL.jpg) ![Tjernlund PS1503P Plug-in Air Pressure Activation Switch for Duct Fans in Central Heating and Air Conditioning Systems - Image 3](https://m.media-amazon.com/images/I/31IMcVaeguL.jpg) ![Tjernlund PS1503P Plug-in Air Pressure Activation Switch for Duct Fans in Central Heating and Air Conditioning Systems - Image 4](https://m.media-amazon.com/images/I/31RZnRV8C5L.jpg) ![Tjernlund PS1503P Plug-in Air Pressure Activation Switch for Duct Fans in Central Heating and Air Conditioning Systems - Image 5](https://m.media-amazon.com/images/I/51NanzDfymL.jpg) ## Questions & Answers **Q: Anyone install on a 2 stage hvac? is the pressure from stage 1 sufficient to activate switch?** A: problem I found was that the pressure switch would come on but wasn't shutting off, you are correct first stage may not be enough pressure unless you have this on the main trunk and not on one of the laterals to a specific room that is already showing to be low on pressure which is probably why you want to add it to the system. a current sensing relay on the furnace attached to the power on the added fan is a better way of turning on the fan if you want my advise. **Q: Amps for plug-in version? there are two indications: 2.5amps (big sticker) and 15amps (diaphram part).** A: Mine I hard wired. But I am guessing it is telling you the line required amperage. So if you use a plug in version it requires a 15amp line which is common. The line aI tapped into was 15 amp. **Q: stopped working after 1.5 months, unit is perfectly vertical and has a good seal on the duct. Anyone have any ideas for fixes?** A: mine stopped working when season changed and fan speed slowed on furnace motor sent back got a refund ## Frequently Bought Together - Tjernlund PS1503P Plug-in Air Pressure Activation Switch for Duct Fans in Central Heating and Air Conditioning Systems - VIVOSUN 6 Inch Inline Duct Fan 240 CFM, HVAC Exhaust Ventilation Fan with Low Noise for Basements, Bathrooms, Kitchens and Attics, Silver - DiversiTech 625-AF10 Duct Fan, HVAC Exhaust Ventilation, Improved Airflow, Temperature Regulation, Easy Installation,10”, 650 CFM, 60W --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sg/products/160879622-tjernlund-ps1503p-plug-in-air-pressure-activation-switch-for-duct](https://www.desertcart.sg/products/160879622-tjernlund-ps1503p-plug-in-air-pressure-activation-switch-for-duct) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-10-01*