The Siemens 3RH2911-2HA13-0KT0 is a front-mounted auxiliary switch block for the SIRIUS family, designed to snap onto 3RT2 power contactors and 3RH2 contactor relays. It provides one normally-open and three normally-closed auxiliary contacts, wired out to terminals 31/32, 41/42, 51/52, and 63/64 respectively. Rated for a maximum of 10 A, the contacts carry AC-15 pilot-duty loads at 690 V up to 1 A, and switch DC control circuits at various voltages — 6 A at 24 V, 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, and 0.26 A at 600 V. The AC-15 rating at 690 V (1 A) is the relevant figure for switching contactor coils or solenoid valves in a 400/690 V panel. Mechanical life is rated for 10 million switching cycles typical.
The spring-loaded terminals accept 2x (0.5 to 1.5 mm²) with ferruled ends, or 2x (0.5 to 2.5 mm²) without core-end processing; AWG equivalents are 2x (20 to 14).
Ratings in context
The 6 kV surge voltage resistance (rated value) and insulation voltage of 690 V at pollution degree 3 mean this block is suitable for 400 V line-to-line panels with a 600 V impulse-withstand requirement — typical for IEC 60947-5-1 auxiliary contact applications.