S203/T01 20A

The P203T01 is also manufactured by the company Asco, in the past the name of these pressure switches was Sirai. This name change happened for all the products of Sirai. This Asco Pressure switch is a 2 pole instead of a 3 pole pressure switch. With a full plastic cover.

This pressure switch has been used espresso machines like: La Pavoni, Rocket and La Spaziale

The P204T01 is a slightly lighter pressure switch. The pressure of this switch can be adjusted from 0,5 to 1,4 bar. The max fluid temperature is 140 °C. with a max contact load of 20A. The difference between the P303T01 and the P203T01 is the number of poles. 2 instead of 3.

The connection for the pressure is a ¼” BSP-G with a pipe 4x6 mm

The principle of a spring actuated pressure switch is that when the boiler pressure raises, a membrane goes up and when it reaches the set pressure the contacts will disconnect. This results that there goes no power to the heating element anymore. When the pressure in the boiler lowers the contacts will connect again and the heating procedure starts over again.

For more information about the working of pressure switches, go to our blog page and you will find a article about pressure switches.