Contact ratings and switching reliability
The 3RH1921-1HA22-ZX95: Rated at 10 A maximum, the block delivers 6 A at 24 V DC and 6 A at 230 V AC (AC-15). At 400 V AC the rating drops to 3 A; at 690 V AC-15 it holds 1 A. The DC switching curve follows: 6 A at 24 V, 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 0.5 A at 440 V, and 0.26 A at 600 V. Mechanical service life is 10 million switching cycles typical. Contact reliability is specified at 1 faulty switching per 100 million operations at 17 V, 1 mA — relevant for PLC-level signal integrity.
Integration with 3RT1 contactors
Snap-on mounting directly onto the contactor face — no DIN rail required. The block is 44 mm wide, 51 mm deep, and 38 mm tall, sized to sit flush on 3RT1 frames S0 through S12. Screw terminals accept 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. Front-side IP20 protection covers the terminals. Insulation voltage is 690 V AC at pollution degree 3, with 6 kV surge voltage resistance.