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SPC Company
Electrical & Controls / Sensing & Feedback / Sensing & Feedback
System · Electrical & Controls Layer 3 · Sensing & Feedback 1 product types

Sensing & Feedback

Pressure switches and feedback parts that make the compressor start and stop at the right pressure.

Request a quote → Compare the 1 types ↓ See the decision guide ↓
The Sensing & Feedback family 1 types · Sensing & Feedback
Pressure Switch

Tap any type to jump to its page. The Decision Guide further down asks three questions that funnel the spec to one of these.

Real-world reference Representative sensing & feedback
Category family Sensing & Feedback
What this category is

The signal that tells the compressor when to run

FEEDBACK
Pressure becomes a control signal

Sensing & Feedback covers the pressure switch that starts and stops the compressor based on tank pressure.

PRESSURE BAND
Cut-in and cut-out matter

The pressure range and differential need to match the compressor, tank, and safety valve settings.

CONNECTIONS
Ports and unloader options are not universal

Port count, thread style, lever, and unloader tube fittings decide whether the switch fits the machine.

The 1 types · side-by-side

Best-for, key trade-off, capacity, price band, and how deep the brand bench runs.

Distributor-facing reading. The trade-off column is the one that closes the loop — every type buys something and gives something up. Knowing what each type costs you is how the right one gets on the quote without a callback.

Product type
Best for
Key trade-off
Typical capacity
Price band
Brands SPC carries
Pressure Switch →
Compressor start-stop control Use when the compressor is not cycling correctly, the contacts are worn, or the pressure band has drifted.
Must match the circuit and pressure range Voltage, amp rating, pressure band, port count, and unloader style need to be confirmed before quoting.
Pressure and electrical rating matched
$
3 / 5 ? common service item
Decision guide

2 questions “Funnel the Spec” to one product type.

Draw a line from the customer's answer at the top to the type name at the bottom. This is the page distributors screenshot and send to a customer the day before a quote call — so the customer comes prepared with the answers, and the call is about the brand and the budget, not the basics.

Use this Print this page, drop it in an email to the end customer, or screenshot the tree below. The questions and the type recommendations are designed to stand on their own without the rest of the page.
START AT THE TOP  ·  FOLLOW THE PATH DOWN  ·  END ON THE PRODUCT TYPE
Question 1
Is the start-stop signal based on tank pressure?
Yes, replace or quote the pressure switch
Recommend
Pressure Switch
Match pressure range, electrical rating, ports, and unloader options.
See product type →
No, the issue is sequencing multiple machines
Recommend
Alternating Relay
Route lead-lag behavior to the control logic layer.
See product type →
The inputs behind the tree · what we'll need to quote

4 answers settle the right sensing & feedback — gather these before the quote call.

01
What are the cut-in and cut-out pressures?
The pressure band determines the replacement switch range.
02
What voltage and motor amps does it switch?
Electrical rating must be safe for the circuit.
03
Does the switch include an unloader valve or lever?
Compressor pressure switches often fail by missing the physical options on the old unit.
04
What thread and port count are on the old switch?
Port layout controls fit on the compressor manifold or tank.
Where this category lives
L3
Electrical & Controls System · Layer 3

Sensing & Feedback

The sensing layer that turns system pressure into an electrical start-stop signal.
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Pressure switches close the loop between stored air and motor control. A wrong pressure band, amp rating, port style, or unloader option can make a simple replacement fail immediately, so the quote needs the old switch details and the compressor duty.

Categories in this layer
Role in the layer
Control & Logic

Sensing feeds the logic: the switch reports, the control decides.

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Role in the layer
Compressor Room

What the sensing serves; the pressure switch starts and stops the compressor it sits on, sized to the compressor's duty and motor.

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Not sure which type? Send us the use case.

Tell us the end-use, the rough flow, and what climate the unit would sit in. We'll come back with a configured quote — the right type, the right tier, and the upstream gear the warranty assumes.

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