This designation designs all switch devices which close or open one or several circuits with regard to the needle position of pressure gauge.
Contacts with slow action : warrant high adjusting accuracy with reduced hysteresis.
Contacts with sudden action (magnetic) : permit to reduce creation of electric arcs due to ill-timed switch-on of contact.
They are normally closure type :
- Close contact at pressure reduction : function 1.
- Close contact at pressure build-up : function 2.
The capacity of cutoff varies from 18 VA to 50 VA (on resistive circuits).
Use of time delay relay MSR is obligatory for control pressure gauges with shock absorbing liquid.
Electric connection : plastic connector DIN 43650 / Staffing box PG9.