The Siemens SIRIUS 3RH1911-1HA13-ZW97 is a 4-pole auxiliary switch block with 1 normally open and 3 normally closed contacts, designed for snap-on mounting onto contactor relays and power contactors in the SIRIUS family.
This block is rated for switching auxiliary circuits across a wide voltage range: 10 A at 24 V, 6 A at 125 V, 6 A at 230 V, 6 A at 250 V, 3 A at 400 V, and 0.3 A at 220 V. The AC-15 rating at 690 V is 1 A. These numbers tell you what the contacts can handle in real motor-control logic circuits — the 10 A at 24 V is the highest draw, typical for DC control loads, while the 0.3 A at 220 V shows the drop-off at higher AC voltages.
The 3RH1911-1HA13-ZW97 is a phased-out product. The official successor is the SIRIUS 3RH2 series. No last-time-buy window remains; this is a surplus/broker-channel part.
Snap-on mounting onto the contactor or relay — no tools needed. The block measures 36.5 mm wide, 41.5 mm deep, and 37.5 mm high. It accepts 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) with core-end processing, or 2x (20 to 16) and 2x (18 to 14) AWG.
Electrical and Environmental Ratings
Mechanical service life is 10 million switching cycles typical. The block is intended for use with contactor relays and power contactors in the SIRIUS range.