The Siemens SIRIUS 3RT2916-2BE01 is an OFF-delay device — a bolt-on timing block that holds a contactor closed for a set period after the control signal drops. It's sized for S00 and S0 frame contactors in the 3RT2 series and 3RH2 auxiliary contactor relays, both AC/DC and DC-operated coils. The 24 V DC coil voltage is fixed; there's no tap or range, so match it exactly to the contactor coil voltage. Mounting is screw and snap-on onto 35 mm DIN rail per EN 50022. The device can be mounted in any position, which simplifies panel layout when space is tight. Screw-type terminals for the auxiliary and control circuit — standard for panel builders who prefer a screwdriver over a cage clamp.
What the ratings mean for fit
The operating temperature range of -20 to +60 °C covers most indoor industrial panels; storage range of -40 to +80 °C means it can sit in an unheated warehouse or truck without damage. The finger-safe touch protection (IP20 at the terminals) is the usual panel-side requirement — no special shrouding needed inside a locked enclosure. Because this is an OFF-delay (timed-off) device, it's the part you add when a process needs the contactor to stay closed for a few seconds after the stop command — think conveyor braking, pump run-down, or post-lubrication cycles. It's not a general-purpose timer; it only delays the dropout, not the pickup.