The 230 V AC / 20 A main contact rating covers resistive and moderate inductive loads such as lighting circuits, small heating elements, or contactor-driven motor starters within that current envelope. The 24 V AC coil is standard for building-management or PLC-driven control loops — verify your control transformer matches AC coil voltage, not DC, because the coil impedance and dropout characteristics differ. The 1 000 W incandescent lamp switching capacity gives a practical ceiling for lighting banks; exceeding it risks contact welding on inrush. The manufacturer explicitly notes that spacers are required between adjacent units to dissipate the 1.7 W per-pole heat loss; stacking them tight without air gaps will shorten service life.
Panel integration
Supplementary devices (auxiliary contact blocks, surge suppressors) can be added to the side or top via the product's extension interface.