Lutron® MS-HS3-WH-C
MFR Part #:MS-HS3-WH-C
- Manufacturer Name :Lutron
The Lutron MS-HS3-WH-C humidity sensor switch is a wall-mounted control designed to automatically operate bathroom or utility room exhaust fans based on humidity levels. It helps maintain proper ventilation by detecting rapid moisture increases and activating connected fan loads.
- Lutron® MS-HS3-WH Humidity Sensor, Wall Mounting
Advanced humidity sensing (digital signal processing) → Accurately detects both rapid moisture spikes (e.g., showers) and gradual humidity buildup for reliable fan activation
Adjustable humidity threshold (50%–80%) → Allows precise control over when the fan turns on to prevent excess moisture in damp environments
Multiple operating modes (Shower, Climate, Air Cycle) → Enables tailored performance for bathrooms, basements, or low-ventilation spaces
Configurable timeout settings (5–45 minutes) → Ensures the fan runs long enough to remove moisture without unnecessary energy use
Ambient light detection (ALD) → Prevents the fan from activating in dark, likely unoccupied spaces, reducing unwanted operation
Manual override control → Lets users keep the fan ON or OFF indefinitely when needed
Supports fan or fan/light combination loads → Flexible installation for common residential ventilation setups
Code compliance capability → Can be used to meet IECC and CALGreen requirements for intermittent exhaust control
Specification
Details
Model
MS-HS3-WH-C
Product Type
Humidity Sensor Switch
Voltage
120 V~, 50/60 Hz
Load Capacity
3 A fan; 3 A fan/light combination
Motor Rating
1/10 HP fan
Control Type
Single-pole only
Wiring Requirement
Neutral or ground wire required
Operating Temperature
32°F to 104°F (0°C to 40°C)
Installation
Wall-mounted (wallplate sold separately)
Dimensions
4 11/16 in (H) × 2 15/16 in (W) × 1 1/8 in (D approx.)
Environment
Indoor use only
Certifications
UL listed (U.S. & Canada), NOM
Warranty
5-year limited warranty
Color/Finish
Gloss white
Bathrooms and shower areas → Automatically activates exhaust fan when humidity rises during or after use
Basements and utility rooms → Uses Air Cycle mode to circulate stale air at regular intervals
Damp indoor spaces → Maintains humidity levels within configurable thresholds to reduce moisture buildup
Residential ventilation systems → Suitable for single-pole fan or fan/light combinations
Works With:
- Exhaust fans rated up to 3 A
- Fan and light combination loads (within 3 A total)
- Single-pole electrical installations
Requirements:
- 120 V power supply
- Neutral or ground connection (depending on wiring configuration)
Not Compatible With:
- Paddle-type ceiling fans
- Kitchen exhaust-type fans
- 3-way or multi-location circuits
What does the Lutron MS-HS3-WH-C control?
It controls exhaust fans or fan/light combinations by automatically turning them on when humidity rises above a set level.
Can I adjust how long the fan runs?
Yes. The timeout is adjustable to 5, 15, 30, or 45 minutes, allowing you to control how long the fan continues running after activation.
Does the switch work in multi-location (3-way) setups?
No. The device is designed for single-pole installations only and is not suitable for multi-location circuits.
Does the sensor run the fan continuously?
No. It activates the fan based on humidity changes or programmed modes. You can also manually override it to keep the fan ON or OFF indefinitely.
How does the humidity detection work?
The Lutron MS-HS3-WH-C uses advanced signal processing to detect both rapid humidity increases (like showers) and gradual changes, ensuring accurate and responsive fan control.