Pack of 12 – complete set flush-mounted box size 503 (3 modules) for sockets and switches, ideal for private and commercial installations. Compatible with Italian Standard - Compatible with BTicino, Gewiss, Vimar and other popular brands. Ideal for new installations or replacement Installation of. The PT-G503-PHR-PTP Series redundancy boxes (RedBoxes) are compliant with the latest standardized redundancy protocols for industrial automation networks, IEC 62439-3 Clause 4 (Parallel Redundancy Protocol, PRP) and IEC 62439-3 Clause 5 (High-availability Seamless Redundancy, HSR). PRP/HSR ensures. Shipping fee and delivery date to be negotiated. Chat with supplier now for more details. A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). Distribution Box part number 17G420553-503 Submitted as distribution box NSN 6110-01-510-7479.