Which device is described as having both a high and a low switch in a single unit?

Which device is described as having both a high and a low switch in a single unit?

• A. Single-pressure switch.
• B. Three-position switch.
• C. Dual-pressure switch.
• D. Multi-pressure switch.

Answer: (C)

Having both high and low switches in a single unit is a dual-pressure switch. It contains two pressure-sensing elements in one housing, each with its own contacts that trip at different setpoints. The high-pressure side provides overpressure protection to keep the compressor and system components safe, while the low-pressure side protects against low suction pressure that could damage the compressor or cause poor operation. Keeping both protections in one device saves space and simplifies wiring. The other options describe devices that monitor only one pressure point or serve as a selector, not a single unit that includes both high and low pressure switches.

Having both high and low switches in a single unit is a dual-pressure switch. It contains two pressure-sensing elements in one housing, each with its own contacts that trip at different setpoints. The high-pressure side provides overpressure protection to keep the compressor and system components safe, while the low-pressure side protects against low suction pressure that could damage the compressor or cause poor operation. Keeping both protections in one device saves space and simplifies wiring. The other options describe devices that monitor only one pressure point or serve as a selector, not a single unit that includes both high and low pressure switches.