Panel fit and mounting constraints
The 3RH2122-4AG60 is a SIRIUS S00-frame auxiliary contactor — the smallest frame in the series, sized for control-circuit switching rather than main motor loads.
Contact configuration and switching duty
The auxiliary switch extension is supported — the product designation confirms auxiliary switching capability, so a field-added contact block can increase the pole count without replacing the base unit. In practice, electrical life will be lower and depends on the switched current and voltage; the mechanical figure tells you the actuator and spring set are built for high-cycle PLC or interlock duty.
Environmental and compliance data
Relative humidity minimum is 10 %. RoHS compliance is indicated by a substance prohibition date of 10/01/2009 — the part was designed to meet the 2009 EU RoHS deadline. No UL or CSA listing appears in the spec record; confirm site-specific approval requirements against the full manufacturer declaration.