Description
The Supco SHL504 is a board-mounted general purpose limit switch engineered for dependable over-temperature protection in a wide range of HVAC heating applications. Featuring fixed-temperature actuation points and an automatic reset mechanism, this limit switch provides a reliable first line of defense against unsafe operating temperatures — helping protect heat exchangers, furnace components, and associated equipment from thermal damage.
Key Features
- Fixed Open Temperature: 240°F — trips to interrupt the circuit when a dangerous temperature threshold is reached
- Fixed Close Temperature: 200°F — automatically resets and restores circuit continuity once temperatures return to a safe level
- Auto Reset operation — no manual intervention required after a trip event
- SPST Normally Closed (NC) switch configuration — circuit is closed under normal operating conditions
- 3.12″ insertion length for secure, precise board-mounted installation
- Board-mounted design simplifies integration into OEM control boards and replacement applications
Specifications
- Brand: Supco
- Part Number: SHL504
- Switch Type: SPST Normally Closed (NC)
- Fixed Open Temperature: 240°F
- Fixed Close Temperature: 200°F
- Reset Type: Auto Reset
- Insertion Length: 3.12″
- Mounting Style: Board Mounted
- Application: General Purpose Limit Switch
Application
The SHL504 is ideal for use in residential and light commercial furnaces, air handlers, and other HVAC heating equipment where board-mounted limit protection is required. Its fixed-temperature design ensures consistent, repeatable performance without the need for field calibration, making it a trusted choice for OEM replacements and service repairs.
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