A mechanical pressure switch is a device that monitors the pressure of liquid or gas and opens or closes an electrical circuit when a preset pressure threshold is reached.
What types of pressure switches are available?
SUCO ESI North America offers diaphragm and piston mechanical pressure switches for a wide range of pressure monitoring applications.
Diaphragm Pressure Switches:
- Pressure range: 0.1 to 100 bar
- Overpressure safety: 35 to 700 bar (depending on diaphragm type)
Piston Pressure Switches:
- Pressure range: 10 to 400 bar (depending on size)
- Overpressure safety: up to 700 bar
Pressure Switch Sizes:
SUCO pressure switches are available in Hex 24, Hex 27, and 30 A/F sizes, each offering specific hydraulic, pneumatic, and electrical characteristics.
Diaphragm vs. Piston Pressure Switches – SUCO Guide
How a Pressure Switch Works
✅ Normally Open (NO) Pressure Switch:
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Before pressure is applied: The circuit is open.
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When pressure exceeds the set point:
Pressure moves the diaphragm (2a) or piston (2b) via the pressure connector (1).
If the pressure force exceeds the spring force (3), the plunger (4) pushes the contact disc (5) to meet the counter-contact (6), closing the circuit. -
When pressure drops (hysteresis): The switch reopens.
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✅ Normally Closed (NC) Pressure Switch:
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Before pressure is applied: The circuit is closed via the NC contact (8).
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When pressure exceeds the set point:
The plunger (4) moves the swivel contact (9), switching from NC to NO (10) contact, opening the NC circuit and closing the NO circuit. -
Adjustment: The adjustment screw (7) allows fine-tuning of the switching point.
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???? What are the electrical contact types in a pressure switch?
Pressure switches can use snap-action micro switches that support:
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Change-over contacts (includes both NO and NC functions)
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Swivel contact (9) for fast switching between states
⚡ Voltage and Load Control Ratings:
AC Voltage Categories:
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AC-12: For ohmic and semiconductor loads (e.g., PLC inputs)
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AC-14: For electromagnetic loads (up to 72 VA)
DC Voltage Categories:
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DC-12: For ohmic and semiconductor loads (e.g., PLC inputs)
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DC-13: For controlling electromagnets
Contact Us for More Information
Have questions or need assistance with choosing the right pressure switch for your application?
???? Contact SUCO ESI North America today, and our expert team will be happy to help you find the ideal solution.
Phone: 1-800-473-7313 for personalized support
Email: sales@sucoesi.com