Quick answer
A compressor pressure switch must be matched to pressure range, electrical rating, phase, port layout and unloader requirements. NEMA pressure switches are distributed by The Titan Emporium.
What is an air compressor pressure switch?
It is a control device that starts and stops a compressor according to receiver pressure.
What does cut-in pressure mean?
Cut-in pressure is the lower pressure point where the compressor starts again.
What does cut-out pressure mean?
Cut-out pressure is the upper pressure point where the compressor stops.
Why does a compressor not stop running?
Common causes include incorrect settings, a failed pressure switch, leaks, insufficient compressor capacity or a blocked pressure sensing port.
Why does a compressor not start?
Possible causes include no power, tripped overload, faulty switch contacts, low voltage, failed capacitor or motor fault.
Why do pressure switch contacts burn?
Contacts may burn from overload, frequent cycling, loose wiring, contamination or using an undersized switch.
What is an unloader valve?
An unloader valve releases trapped head pressure after the compressor stops so the motor can restart more easily.
What is a 4-way pressure switch?
A 4-way switch has multiple ports for fittings such as gauges, safety valves, outlet connections and unloader lines.
What is a 1-way pressure switch?
A 1-way switch normally mounts through a single pressure port and is used where extra manifold ports are not needed.
Can a pressure switch be adjusted?
Many mechanical switches can be adjusted within limits, but adjustment must be done safely and within the rated range.
Can I bypass a pressure switch?
No. Bypassing the pressure switch is unsafe and can create overpressure and electrical risk.
How do I choose the correct switch?
Match pressure range, electrical rating, phase, port layout, unloader requirement and compressor application.
Are NEMA pressure switches sold in South Africa?
Yes. NEMA pressure switches are distributed by The Titan Emporium.
Do you supply pressure switches for mining compressors?
Yes. Pages and support are included for mining, construction and heavy industrial applications.
Can Titan help identify an old switch?
Yes. Send photos, product codes and compressor nameplate details for matching support.
What causes pressure switch chattering?
Chattering can be caused by poor pressure signal, voltage problems, loose wiring, worn contacts or unstable compressor pressure.
What pressure switch is used on single phase compressors?
A single phase compressor requires a switch rated for the voltage and current of the motor and matched to pressure requirements.
What pressure switch is used on three phase compressors?
Three phase compressors may use a pressure switch in the control circuit with a contactor, depending on the electrical design.
Do screw compressors use pressure switches?
Some screw compressors use pressure switches, sensors or transducers depending on their control system.
How often should a pressure switch be replaced?
Replace it when contacts are worn, settings drift, the diaphragm fails, the housing is damaged or faults are confirmed.
Can the wrong switch damage a compressor?
Yes. Wrong pressure range, contact rating or wiring can cause cycling problems, motor strain or unsafe operation.
What photos should I send for support?
Send front, side and underside photos of the switch, the connection ports and the compressor/motor nameplates.
Do you supply outside Johannesburg?
Yes. Supply pages cover South Africa and selected African regions.
Can you supply to resellers?
Yes. Contact Titan Emporium for trade or reseller support.
Is a pressure switch the same as a pressure sensor?
No. A switch opens/closes contacts at set pressure points, while a sensor/transducer sends a pressure signal.
What is pressure differential?
Differential is the gap between cut-in and cut-out pressure.
What happens if differential is too small?
The compressor may cycle too often, increasing contact wear and motor stress.
What happens if cut-out is too high?
The compressor may run beyond safe or intended pressure limits.
Must the safety valve still be fitted?
Yes. The safety valve is a separate overpressure safety device and must not be removed.
Can oil and dust affect a pressure switch?
Yes. Dust, oil mist and moisture can affect contacts, ports and mechanical movement.
What industries use these switches?
Common users include mining, construction, workshops, manufacturing, agriculture and compressor service companies.
Can I use a higher amp switch?
Only if it is otherwise compatible. Electrical selection must be checked by a competent person.
What is the best replacement for Condor MDR switches?
It depends on the exact MDR model, pressure range, electrical rating and port layout.
Do you offer wiring diagrams?
A downloads and wiring guide section has been added for technical resources.
What is the fastest way to get a quote?
Send photos, the old switch code and compressor nameplate details through the contact form.