Markel 29157004 Limit 321702-401 calibrated to "open on rise"

calibrated to "open on rise" at 600 PSI cut-out and automatically reset (cut-in) at 475 PSI

offering maximum flexibility for various drive configurations

using the correct OEM replacement filter is critical to preventing static pressure imbalances that can lead to premature blower motor failure

allowing the heating cycle to resume without technician intervention

to ensure the internal regulator functions correctly

Markel 29157004 Limit 321702-401 calibrated to "open on rise"The Markel 29157004 Limit is a mission critical high limit safety switch designed for precision thermal protection in HVACR systems. Specifically engineered for duct heaters and electric heat assemblies, this manual reset limit prevents catastrophic equipment failure by breaking the electrical circuit when internal plenum temperatures exceed safe thresholds. Identified by the technical designation MFHE LIMIT RD103 002 104C, this component triggers at