Castair Honeywell Pressure Switch — HON1012
The HON1012 is a Honeywell pressure switch in Castair's replacement parts line. Pressure switches are the primary motor control device on an air compressor — they monitor tank pressure and open or close the motor circuit at the set cut-in and cut-out pressures. When a pressure switch fails, the compressor either runs continuously (switch contacts stuck closed), refuses to start (contacts stuck open), or cycles erratically (drifting setpoints). The HON1012 is the factory-sourced Honeywell switch for Castair compressor installations that specify this model.
Note: Full electrical specifications (voltage, amperage, pressure range, unloader configuration) for the HON1012 are not published on the Castair manufacturer website. Call 866-217-0063 before ordering to confirm this is the correct switch for your compressor model.
How to Tell If Your Pressure Switch Has Failed
Pressure switch failures show up in a few distinct patterns. Understanding which pattern you are seeing helps confirm the switch is the problem before you order a replacement:
- Runs but never shuts off: Switch contacts are stuck closed (welded from arcing) or cut-out setpoint has drifted above the safety valve range. Compressor runs continuously until a safety valve opens or a breaker trips.
- Will not start: Switch contacts are stuck open, or the cut-in setpoint has been adjusted too high. Motor never gets the start signal even with empty tank.
- Short cycling: Cut-in and cut-out pressures are too close together, contacts are dirty, or switch is responding to a pressure spike. Compressor starts and stops rapidly.
- Trips breaker on restart: If no unloader is present (or the unloader valve failed), the motor has to start against full tank pressure. On single-phase motors especially, this often exceeds starting torque and trips the breaker.
- Visible damage: Burned or corroded contacts visible when the switch cover is opened.
HON1012 Pressure Switch Features
- Honeywell Manufacturing: Industrial-grade pressure switch from one of the most established names in the category
- Corrosion Resistant Cover: Protects internal contacts and adjustment points from shop humidity, dust, and oil mist
- UL/CSA Listed: North American electrical safety certification
- Adjustable Setpoints: Most Honeywell switches allow cut-in and cut-out pressure adjustment within the rated range
- Castair Specified: Used in Castair compressor installations requiring this HON-series switch
Castair Pressure Switch Selection Guide
Choosing the correct pressure switch for a Castair compressor requires matching the pressure range, amperage, phase, and unloader configuration. The HON series and PSL/PSH series serve different models and configurations:
Castair-Brand PSL/PSH Switches
- 95-125 PSI range: PSL1 (plain), PSL1X (unloader), PSL1MIX (unloader + on/off), PSL4MIX (unloader + on/off + four-way)
- 145-175 PSI range: PSH1 (plain), PSH1X (unloader), PSH1MIX (unloader + on/off), PSH4MIX (unloader + on/off + four-way)
- Wide-range adjustable: PSAD15-230 (15-230 PSI, adjustable differential)
Honeywell OEM Switches
- HON1010 — Honeywell switch, specific model for certain Castair configurations
- HON1012 — THIS PRODUCT — Honeywell switch, specific model for certain Castair configurations
- HON1420 — Honeywell switch, specific model for certain Castair configurations
What's in the Box
- 1 x Honeywell pressure switch (HON1012)
Technical Specifications
- Part Number: HON1012
- Brand: Honeywell (sold through Castair)
- Category: Pressure switch — motor control component for air compressors
- Electrical Ratings: Contact us at 866-217-0063 for confirmation
- Pressure Range: Contact us for confirmation — specify your compressor model when calling
Why Buy From Air Compressor Factory Direct?
We have specialized in Castair compressor components since 2016. Pressure switch selection is model-specific — get the wrong one and it either does not fit or operates at the wrong pressure setpoints. We can cross-reference your compressor model to confirm the HON1012 is the correct replacement before you order. Free shipping, free technical support at 866-217-0063, full manufacturer warranty.
Call 866-217-0063 for quick answers and help!
