The Siemens 3RT2926-2PR11 is a pneumatic off-delay block from the SIRIUS family, designed to clip onto size S0 motor contactors. It provides an adjustable delay of 1 to 60 seconds after the contactor coil is de-energized, keeping the auxiliary contacts in their energized state for that period before they drop out. This is useful for sequenced shutdowns, pump-down cycles, or staging delays where equipment needs to run on after the stop command. The block switches one normally-open and one normally-closed auxiliary contact, rated at 10 A maximum in AC-12 duty. Switching capacity varies by voltage: 4 A at 24 V, 2 A at 48 V, 0.7 A at 110 V, 0.3 A at 220 V, 6 A at 230 V, 4 A at 400 V, 0.1 A at 440 V, 2.5 A at 500 V, and 1.5 A at 690 V. The 440 V figure (0.1 A) is a sharp derating point — if your control circuit runs at that voltage, the contact can only handle a pilot-duty signal, not a real load.
This block clips directly onto the front of a SIRIUS S0 contactor — no tools, no DIN rail space consumed beyond the contactor itself. The assembled height is 44.6 mm, width 45 mm, depth 83.5 mm. Front protection is IP20 with finger-safe touch protection per the standard. Short-circuit protection for the auxiliary contacts requires a 10 A gG fuse at 1 kA prospective short-circuit current per IEC 60947-5-1.