Product Description
ACS-5 Atmosphere Current Sensor is a compact, solid-state AC current switch designed to control 120V inline fans based on the current draw of another AC device. This model is pre-configured with a 5-minute turn-off delay, making it ideal for duct booster fan setups where delayed shutdown improves airflow efficiency. It operates automatically with no insertion loss and requires no field adjustment for installation.
Brand: Atmosphere / Panasonic
Model: ACS-5
Voltage: 120V AC switching
Max Load: 2.5 Amps
Trip Point: ~1 Amp
Time Delay (Off): 5 Minutes
Sensor Type: Solid-State Current Switch
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Product Benefits
- Automatically activates a duct booster fan based on current draw
- Built-in 5-minute shutoff delay prevents premature fan cutoff
- Easy to install with no field calibration required
- Self-powered from monitored line—no external power needed
Key Features
- Current-Sensing Trigger: Activates fan when monitored load exceeds ~1 Amp
- 5-Minute Delay-Off Timer: Keeps fan running after the primary device turns off
- Compact Size: Fits in tight junction box spaces (1.95" x 3.45" x 1")
- Reliable Solid-State Design: No moving parts, long lifespan
- ETL Listed: Meets UL 94-V0 flammability rating and cETLus standards
Technical Specifications
| Specifications | |
|---|---|
| Model | ACS-5 |
| Max Load Switching | 120V AC @ 2.5 Amps |
| Trip Set Point | ~1 Amp |
| Turn-On Time | <200 ms |
| Turn-Off Delay | 5 Minutes |
| Leakage Current | <1 mA |
| AC Conductor Hole | 20mm (0.8") Diameter |
| Max Input Current | 50 Amps |
| Operating Temp | 0–40°C (32–104°F) |
Application Examples
- Automatically trigger duct booster fans when HVAC units operate
- Enhance air circulation for dryers, bath fans, or range hoods
- Add time-delayed ventilation to reduce humidity or heat buildup
- Used in interlock systems where auxiliary fans must lag primary loads
Installation Tips
- Pass the interlock device’s power line through the ACS sensor opening
- Wire the output circuit to the inline fan or auxiliary device
- No external power is required—device is self-powered by the AC line
- Use two screws to mount the unit inside a junction box if desired
- Ensure the load current exceeds 1A for activation
Frequently Asked Questions
Q: What is the function of the ACS-5?
A: It acts as a current-sensing switch to automatically activate another device—typically a duct fan—based on the current draw of a monitored circuit.
Q: What is the off delay time?
A: The ACS-5 has a built-in 5-minute delay after the primary device turns off before deactivating the output load.
Q: How much current does the load need to draw to activate the switch?
A: Approximately 1 Amp is required to trip the switch and activate the output.
Q: What is the maximum load it can switch?
A: Up to 2.5 Amps at 120V AC.
Q: Does the ACS-5 need an external power source?
A: No, it is powered by induction from the line being monitored.
Q: Can it be used with 230V systems?
A: The monitored circuit can be 230V, but the output switch is rated for 120V AC only.
Q: Is the ACS-5 certified?
A: Yes, it is cETLus listed and meets UL 94-V0 flame resistance standards.
