The Siemens SIRIUS 3RT2916-1JP00 is a varistor-type surge suppressor with an integrated LED indicator, designed specifically for DC-operated coils on SIRIUS contactors 3RT2.1 and auxiliary contactors 3RH2 in the S00 frame size. It clips directly onto the contactor — no additional wiring or DIN-rail space needed — and suppresses voltage spikes when the DC coil de-energizes, protecting nearby electronics and extending contactor life. Rated for 150 to 250 V DC control circuits, it covers the common 220 V DC and 250 V DC rail voltages found in industrial control panels.
The 9 mm depth is the critical dimension: this suppressor tucks into the contactor's own profile without protruding past the S00 frame, so it doesn't steal clearance from adjacent devices on the DIN rail. Clip-on mounting and a 28 mm width mean it occupies no extra rail space — it's sized to match the contactor's own width, so a fully populated row of S00 contactors with suppressors fits the same panel layout as bare contactors. Any mounting position is permitted, simplifying installation in tight or awkward enclosures.
It is the direct varistor suppressor for the 3RT2.1 contactor family and the 3RH2 auxiliary contactor family — no adapter or alternative mounting kit is required.