Description
The Marley Engineered Products 4520-2018-003 is a 180°F cutout automatic reset limit switch designed to provide reliable over-temperature protection for electric heating equipment. As a critical safety component, this limit switch monitors heater operating temperatures and automatically interrupts the circuit when the set-point threshold is reached — then resets once safe temperatures are restored, minimizing downtime and service calls.
Key Features
- 180°F (82°C) cutout temperature rating for precise over-temperature protection
- Automatic (CO) reset operation — restores circuit automatically once temperature drops to safe level
- Designed as a direct OEM replacement for Marley Engineered Products electric heaters
- Interrupts heater operation to prevent damage from overheating conditions
- Compact, durable construction for long service life in demanding heating environments
Application
This limit switch is a factory-specified safety control used in Marley electric heaters, including unit heaters and related electric heating appliances. It serves as the primary thermal cutout device, protecting heating elements, wiring, and surrounding components from damage caused by excessive temperatures due to restricted airflow, fan failure, or other fault conditions.
Product Specifications
- Brand: Marley Engineered Products
- Part Number: 4520-2018-003
- Cutout Temperature: 180°F
- Reset Type: Automatic (CO — Cutout/Auto Reset)
- Function: Over-temperature limit protection
- Application: Electric unit heaters and heating equipment
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