Description
Honeywell – CG510A / CG511A / CG512A – Thermostat Guards with Key Lock
Product Description:
Protect your thermostat from unwanted tampering and environmental exposure with the Honeywell Thermostat Guards. Available in three sizes—Small, Medium, and Large—these durable, UV-resistant covers feature a secure key lock mechanism and a clear plastic design that resists yellowing. Ideal for commercial or residential settings where access restriction is necessary.
Key Features:
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Key lock with inner shelf to prevent tampering
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Clear plastic cover resists yellowing
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Compatible with most Honeywell and other thermostat models
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Easy installation over existing thermostats
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Available in 3 sizes: Small (CG510A), Medium (CG511A), and Large (CG512A)
Specifications:
| Model | Size (WxHxD) – Retail | Fits Thermostat Models | Package Weight | Cubic Ft |
|---|---|---|---|---|
| CG510A | 7.5″ x 9″ x 2.5″ | The Round®, CT3x, RTH5100B | 0.8 lbs | 0.11 |
| CG511A | 9.5″ x 11″ x 3″ | RTH8xxxx, RTH7xxxx, RTH6xxxx*, RTH5xxxx*, CT3x | 1.0 lbs | 0.17 |
| CG512A | 12″ x 11″ x 3.25″ | RTH8xxxx, RTH7xxxx, RTH6xxxx*, RTH5xxxx*, RTH4xxxx, CT5x | 2.0 lbs | 0.25 |
*May require off-center mounting for battery door access on some Honeywell models.
Available Variants:
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CG510A – Small Guard
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CG511A – Medium Guard
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CG512A – Large Guard



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