It's built in the S00 size frame, the smallest in the SIRIUS family, and carries a 110 V DC coil. The 3RH1122-1BF40 provides two normally-open (NO) instantaneous contacts, meaning they close the instant the coil is energized with no intentional delay. The coil draws 3.2 W both at pickup and holding, so the power supply doesn't need to handle an inrush spike — useful when sizing a 24 V or 110 V DC bus for a panel full of contactors.
At 45 mm wide and 72 mm deep, it leaves room alongside a main contactor in a standard 60 mm deep enclosure. Terminals accept solid conductors: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm². That covers most control wiring from signal loops to short motor-circuit leads.
The contacts are rated for switching at various voltages: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V. At the coil voltage of 110 V DC, the rated switching current is 1 A — that's the figure to check when switching a DC load like a small solenoid or indicator lamp.
Shock resistance is rated at 10g for 5 ms and 5g for 10 ms, which covers most industrial vibration environments like conveyor lines or pump skids.