---
product_id: 453269425
title: "Tjernlund PS1503P Plug-in Air Pressure Activation Switch for Duct Fans in Central Heating and Air Conditioning Systems"
brand: "tjernlund"
price: "€ 255.20"
currency: EUR
in_stock: true
url: https://www.desertcart.fi/products/453269425-tjernlund-ps1503p-plug-in-air-pressure-activation-switch-for-duct
store_origin: FI
region: Finland
---

# 2 Amps current rating Plug-in connector for easy installation Made in USA, 81-year family legacy Tjernlund PS1503P Plug-in Air Pressure Activation Switch for Duct Fans in Central Heating and Air Conditioning Systems

**Brand:** tjernlund
**Price:** € 255.20
**Availability:** ✅ In Stock

## Summary

> 🔄 Power your airflow like a pro—effortless, reliable, and ready to boost your comfort!

## 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?** € 255.20 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/453269425-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

- • **Robust & Reliable:** Fool-proof bladder tech avoids circuit board errors, ensuring consistent performance every cycle.
- • **Effortless Automation:** Automatically powers duct fans with furnace or AC blower activation—no manual toggling needed.
- • **Heritage You Can Trust:** Backed by 81 years of American craftsmanship—quality and durability you can count on.
- • **Plug & Play Simplicity:** Plug-in design eliminates wiring headaches—snap it in and go, perfect for busy pros.
- • **Universal Compatibility:** Works seamlessly with any brand duct fan, including Tjernlund’s own boosters—future-proof your HVAC setup.

## Overview

The Tjernlund PS1503P is a plug-in air pressure activation switch designed to automatically control duct fans by sensing positive air pressure from your furnace or AC blower. With a 2 Amp current rating and 120V operation, it offers universal compatibility and easy installation via a plug-in connector. Manufactured in the USA by an 81-year-old family business, it features a simple, reliable bladder mechanism that prevents errors and ensures consistent HVAC performance.

## 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 |
|---------------|-------|
| Operation Mode | ON-OFF |
| Current Rating | 2 Amps |
| Operating Voltage | 120 Volts |
| Contact Type | Normally Open |
| Connector Type | Plug In |
| Brand | tjernlund |
| Terminal | Plug in |
| Item dimensions L x W x H | 17.3 x 16.2 x 16.1 Centimeters |
| Circuit Type | 1-way |
| Mounting Type | Snap In Mount |
| Actuator Type | Push Button |
| Contact Material | Copper Or Brass Or Silver |
| International Protection Rating | IP00 |
| Number of Positions | 2 |
| Controller Type | Push Button |
| Control Method | Sensor |
| Connectivity Protocol | Wi-Fi |
| Colour | black |
| Wattage | 5 Watts |
| Net Quantity | 1.0 Count |
| Number of Items | 1 |
| Global Trade Identification Number | 00080956961532 |
| Manufacturer | Tjernlund |
| Country of Origin | USA |
| Model number | B07W7LTY35 |
| Specific Product Use | personal |
| Item Weight | 0.28 g |
| Product Dimensions | 17.3 x 16.2 x 16.1 cm; 0.28 g |
| Item model number | B07W7LTY35 |
| Item Height | 6.34 Inches |
| Item Width | 6.38 Inches |
| Included Components | Tjernlund PS1503P Plug-in Air Pressure Activation Switch |

## Product Details

- **Operation Mode:** ON-OFF
- **Current Rating:** 2 Amps
- **Operating Voltage:** 120 Volts
- **Contact Type:** Normally Open
- **Connector Type:** 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/61Z-qT7IRLL.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/61+X+1T2LzL.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/61b0UccN7RL.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/61wIyDOzU0L.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

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-02-10*