Device accessory for fulfilment of ATEX Certification II 3 G Ex nA II T4 Gc and II 3 D Ex tc IIIC T135 ºC Dc for CU8801-0000, CU8802-000x and CU8803-000x: This option includes a DIN rail mountable strain-relief through the customer in combination with CU8801-0000, CU8802-000x or CU8803-000x.The device accessory is a mandatory prerequisite for usage in hazardous areas as covered by the before mentioned certificate for ATEX Zone 2/22. Please also read the documentation for use in hazardous areas carefully.