The Cleveland Controls RFS-4100-021 is a field-adjustable air pressure switch engineered for reliable HVAC system monitoring and protection. Designed to change contacts on increasing pressure, this switch provides precise, repeatable performance across a wide setpoint range — making it an ideal choice for air handling units, duct pressure monitoring, fan proving, and a variety of commercial HVAC control applications.
Key Features
- Adjustable setpoint range from .15″ w.c. ± .02″ to 5.0″ w.c. for flexible field configuration
- Changes contacts on increasing pressure for fan proving and airflow verification
- Maximum operating pressure of 1/2 PSI (approximately 13.8″ w.c.) for safe, reliable operation
- Wide voltage compatibility: 120–277Vac for use across standard commercial electrical systems
- Field-adjustable design allows technicians to dial in the exact setpoint required without replacing the switch
- Compact, durable construction suited for commercial and light industrial HVAC environments
Specifications
- SKU: RFS-4100-021
- Brand: Cleveland Controls
- Switch Type: Adjustable Air Pressure Switch
- Setpoint Range: .15″ w.c. ± .02″ to 5.0″ w.c.
- Action: Change contacts on increasing pressure
- Maximum Pressure: 1/2 PSI
- Voltage Rating: 120–277Vac
Applications
- Fan proving and airflow verification in air handling units
- Duct static pressure monitoring and control
- Filter status indication
- Commercial HVAC system safety and interlock circuits
- Light industrial pressure sensing and control
![Egis XD Flex 2 Single - Relay w/Knob - Tinned Wires [8710-1500]](https://www.greathardwarehub.com/wp-content/uploads/2026/09/egis-xd-flex-2-single-relay-w-knob-tinned-wires-8710-1500.webp)
