PHOTOCELL 120V - K4221

SKU: K4221
Regular price $21.76

Available for pickup at

  • MT Pool Distributor Corporate (3) in stock
In stock

The K4221 120V Photocell Thermal Control delivers reliable automatic lighting control for pool contractors managing commercial and residential outdoor lighting systems. This stem and swivel mount photocontrol provides professional-grade dusk-to-dawn operation with advanced delay features that prevent false switching from transient light sources.

Commercial Pool Lighting Benefits

Designed for demanding outdoor environments, this thermal photocontrol reduces maintenance calls with its weather-resistant polycarbonate housing and sonic-welded moisture seal. The mechanical bimetal switch with cadmium sulfide photocell ensures consistent performance across temperature ranges from -40°F to 158°F, making it ideal for year-round pool installations.

Why Pool Contractors Choose MT Pools

MT Pools provides superior customer service and wholesale pricing that supports your profit margins on lighting automation projects. Our daily recurring customer support ensures you have the technical expertise and reliable inventory to keep your pool lighting installations on schedule and profitable.

Frequently Asked Questions

What lighting types are compatible with the K4221 photocell?

The K4221 is compatible with fluorescent, HID, and incandescent lighting systems, handling up to 15A incandescent loads and 8.3A/1000VA magnetic ballast loads.

How does the delay feature prevent false switching?

The 30-90 second sensor delay prevents unwanted switching from car headlights, lightning, or other transient light sources, ensuring reliable dusk-to-dawn operation.

Is installation flexible for different fixture types?

Yes, the swivel arm design allows flexible installation to standard outdoor fixtures or electrical boxes with 1/2"-14 NPSM threaded stem and included mounting hardware.

What certifications does this photocontrol have?

The K4221 is UL and cCSAus certified with Green Energy and Title 20 compliance, meeting professional installation requirements for commercial pool projects.

Order Today

Trust MT Pools for your pool lighting automation needs. Our expert team provides technical support and fast shipping to keep your projects profitable and on schedule.

• 120V AC operation with 50/60 Hz compatibility
• Stem and swivel mount design for flexible installation
• Mechanical bimetal switch with cadmium sulfide photocell
• 30-90 second delay prevents false switching from transient light
• Weather-resistant polycarbonate housing with sonic-welded seal
• Operating temperature range: -40°F to 158°F (-40°C to 70°C)
• Compatible with fluorescent, HID, and incandescent lighting
• 15A incandescent load capacity (1800W tungsten)
• 8.3A magnetic ballast capacity (1000VA)
• 1/2"-14 NPSM threaded stem with mounting hardware
• #18 AWG 6" wire leads for easy connection
• UL and cCSAus certified with Green Energy compliance
• 2-year limited warranty
• Activation: ON at 1-5 fc, OFF at 3-15 fc
• Fail-safe mode: ON position for safety