Description
The Marley Engineered Products 4520-11013-001 Limit Large Switch opens circuits when temperatures exceed safe thresholds in heating elements. Its capillary sensing bulb detects heat buildup, activating mechanical contacts to cut power and prevent fire risks. Like unit heaters and radiators in HVAC systems, it monitors fin surfaces during full-load operation. Secured to chassis frames with the bulb strapped across hot zones, the switch resets manually after cooldown periods. Instant protection blocks thermal runaway if airflow drops, preserving element existence across seasonal demands.
