Pneumatic ON-delay block for S0 contactors
The Siemens 3RT2927-2PA01 is a pneumatic delay block that clips onto S0-size SIRIUS contactors (3RT2 series) to add an adjustable ON-delay to one set of auxiliary contacts. It provides a 1 to 30 second pickup delay, with one normally-open and one normally-closed contact switching after the set time elapses.
Delay timing and contact ratings
The pickup delay is adjustable from 1 to 30 seconds with a relative accuracy of 10 %. At 230 V the contact rating is 6 A, and at 400 V it is 4 A. The non-delayed auxiliary contact path (the instantaneous side) carries the same ratings.
The block clips onto the front of an S0 contactor in any mounting position.