It gives you 2 normally-open and 2 normally-closed instantaneous auxiliary contacts, so you can pick up status feedback, interlock a reversing starter, or extend your control logic without a separate relay. The block is rated for 690 V insulation (control circuit, per IEC 60947-5-1) and carries IP20 finger protection, which is standard for inside-panel mounting. If you're working at altitude, it runs without derating up to 3000 m — no need to oversize for a high-placed cabinet.
Standards compliance is broad: EN/IEC 60947-1 and 60947-5-1 for low-voltage switchgear, plus GB/T 14048 equivalents for China, and EN/IEC 60335-1 Clause 30.2 and -2-40 Annex JJ for appliance safety — relevant if this block ends up in a heating or cooling unit.
