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Twist-Lock Thermal Photocontrol · 120V · 1800W Tungsten / 1000VA Ballast · Dusk-to-Dawn · Intermatic LC4521C
SKU: LC4521C
120V twist-lock thermal photocontrol for automatic dusk-to-dawn switching of outdoor lighting loads up to 1800W tungsten or 1000VA ballast. Commonly used for HID and incandescent area lighting on poles and wall packs; for LED retrofits, verify inrush compatibility and control suitability before ordering.
What this product is for
The Intermatic LC4521C is a locking-type thermal photocontrol for automatic dusk-to-dawn operation of outdoor lighting. It mounts to a standard twist-lock receptacle and switches 120 VAC lighting loads based on ambient light level.
Use for
- Pole lights and area lighting
- Wall packs and site lighting using compatible HID or incandescent loads
- Replacement of existing ANSI C136.10 twist-lock photocontrols
- Outdoor lighting circuits where a built-in thermal delay helps reduce nuisance switching
Avoid for
- LED fixtures unless the fixture driver and photocontrol compatibility, including inrush current, have been confirmed
- Applications requiring a stem-mount or button-style photocell instead of a locking receptacle
- Loads exceeding 15 A, 1800 W tungsten, or 1000 VA ballast
Best for
Best for service replacements and standard-duty dusk-to-dawn control on existing 120V outdoor lighting systems that use a twist-lock photocell. This is typically selected where contractors need a straightforward replacement for legacy HID or incandescent controls.
Installed in
Typically installed on outdoor luminaires, pole-top control receptacles, parking lot lighting, roadway-related fixtures, perimeter lighting, and commercial exterior lighting assemblies across Canada.
Why this product exists
This photocontrol automates exterior lighting so lights switch on at dusk and off at dawn without manual control. The built-in thermal time delay, typically 30 to 90 seconds, helps prevent false switching from brief light changes such as headlights or lightning.
Compared with similar products
Compared with electronic or LED-rated photocontrols, the LC4521C is a traditional thermal model commonly used on older HID and incandescent systems. It is a practical replacement choice for existing installations, but modern LED projects often require a control specifically rated for LED driver loads and higher inrush current. Actual performance depends on fixture electronics, circuit layout, and site conditions.
Specifications
- Manufacturer: Intermatic
- Part number: LC4521C
- Product type: Locking type thermal photocontrol
- Mounting: Twist-lock / locking receptacle
- Voltage: 120 VAC, 50/60 Hz
- Load rating: 15 A, 1800 W tungsten
- Ballast rating: 8.3 A, 1000 VA
- Control type: Dusk-to-dawn
- Switch type: SPST
- Photocell type: Cadmium sulfide
- Sensor time delay: 30 to 90 seconds
- Activation: ON at 5 fc, OFF at 15 fc
- Housing: Polypropylene
- Colour: White with gray band
- Operating temperature: -40°F to 158°F (-40°C to 70°C)
- Height: 2.75 in (69.9 mm)
- Standards: ANSI C136.10
- Certifications: cCSAus, cULus
- Environment: Outdoor
- Fail mode: ON
- Typical buying note: Commonly used as a replacement photocontrol on legacy outdoor lighting. For LED conversions, a rule of thumb is to confirm both steady-state load and driver inrush before reusing a thermal photocontrol.
Minimum Order $20
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(Contractor Accounts)
Standard Shipping-Free on orders over $249 in Metropolitan Areas / $499 in Rural Areas
(All Other Accounts)
Standard Shipping-Free on orders over $499
Minimum Order Is $20
Freight Surcharge Apply To Oversized/Over-Weight Items(Not Limited To):
- PVC and EMT Pipe
- Wire and Cable
- Items over 48 inches in length
Surcharges are applied to items on an individual basis regardless if the rest of the order meets prepaid levels. If a freight line appears at the time of check out it only applies to the Items carrying a surcharge and not the entire basket of goods.
Shipping Options:
- A courier can deliver to your home, office, or your job site
- Pick up at local depot near you (applies to the following locations)
Edmonton Warehouse 8135 Roper Rd Edmonton, T6E 6S4, AB
Burnaby Warehouse 5608 Goring St Burnaby, V5B 3A3, BC
Orders are typically delivered within two to eleven business days. The transit time begins the first full shipping day after your order leaves our warehouse. Please allow an additional 2-5 days for delivery to remote locations, additional fees may apply.
THE FOLLOWING APPLIES TO STANDARD SHIPPING OPTIONS
- We cannot deliver to P.O. boxes.
- A signature may be required for shipments over $500.
- No weekend delivery.
- Wire & cable, EMT or PVC conduit, tube lamps 4ft or greater, and 10ft ground rods & mast pipes have special conditions.
Standard Shipping cost on orders less than $499
Total shipping cost = "Per Shipment" cost + "Per Item" cost. The "per item" cost is listed in terms of price per pound.
Product Group | Per Shipment* | Per Item |
|---|---|---|
Boxes | $6.99 | $1.49/lb |
Conduit & Raceway | $149.99 | $2.49/lb |
Connectors & Fittings | $5.99 | $1.19/lb |
Data & Structured Home | $5.99 | $1.19/lb |
Distribution Equipment | $5.99 | $1.19/lb |
Emergency Lighting | $6.99 | $1.49/lb |
Heating & Ventilation | $6.99 | $1.49/lb |
Lighting Controls | $5.99 | $1.19/lb |
Lighting Indoor | $6.99 | $1.49/lb |
Lighting Outdoor | $6.99 | $1.49/lb |
Tools | $4.99 | $.99/lb |
Wire & Cable | $49.99 | $2.29/lb |
Wiring Devices | $5.99 | $1.19/lb |
Any combination of the above items | Highest applicable per-shipment charge | As above |
Effective Date: August, 15, 1998
At Evolt Electrical Supply, customer satisfaction is our top priority. Please review our return policy below:
Returns
Defective Items:
- If you receive a defective item, you may return it for a replacement or refund within 30 days of purchase.
- To initiate a return, please contact our customer service team with your order number and a description of the defect.
Non-Defective Items:
- We do not accept returns for non-defective items. All sales are final once the product is shipped or ordered from the manufacturer. In certain circumstances we may amend this so feel free to contact our customer service team.
Return Process
Authorization:
- Before returning any items, you must obtain a Return Merchandise Authorization (RMA) number from our customer service team. Returns without an RMA number will not be accepted.
- Backordered items can not be cancelled if the item is in transit from the manufacturer, contact us to review.
Shipping:
- Customers are responsible for the return shipping costs. We recommend using a trackable shipping service or purchasing shipping insurance.
Condition:
- Returned items must be in their original packaging and condition. Any items returned damaged due to improper packaging or misuse will not be eligible for a refund or replacement.
Refunds
- Once we receive and inspect your returned item, we will notify you of the approval or rejection of your refund.
- Approved refunds will be processed within [7] business days and a credit will automatically be applied to your original method of payment.
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