Description
The Mars 05413 High Limit Reset Control is a critical safety device engineered to protect HVAC systems and air-handling equipment from dangerous over-temperature conditions. When air temperature rises to a level indicative of fire, this control automatically shuts off the fan, helping to prevent the spread of smoke and flames through ductwork.
How It Works
The 05413 uses a 3-inch element insertion length to accurately sense supply air temperature within the duct or air handler. Once the air temperature reaches the 240°F high limit stop, the normally closed SPST circuit opens, cutting power to the fan. Because this is a manual reset device, the system cannot restart automatically — a technician must physically inspect the equipment and reset the control, ensuring that the root cause of the over-temperature event is addressed before resuming operation.
Key Features
- 240°F high limit stop — shuts off fan when air temperature is indicative of fire
- 3-inch element insertion length for accurate duct or plenum sensing
- Normally Closed (NC) SPST switching action
- Requires manual reset — prevents automatic restart after a high-limit trip
- Designed to interrupt fan operation and limit fire/smoke spread through ductwork
- Compact, durable construction suitable for commercial and residential HVAC applications
Safety & Application
This high limit control is ideal for use in furnaces, air handlers, and fan coil units where fire safety and over-temperature protection are required. The manual reset requirement ensures that every high-limit event is reviewed by a qualified technician before the system is returned to service, providing an added layer of protection for building occupants and equipment.
Specifications
- Brand: Mars
- SKU / Part Number: 05413
- High Limit Stop: 240°F
- Element Insertion Length: 3 inches
- Switch Type: Normally Closed (NC) SPST
- Reset Type: Manual
- Function: Shuts off fan when air temperature is indicative of fire
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