This Harmony XB4, single contact block is pre-assembled on a body/collar fixing unit. It has 1 x NO + 2 x NC contacts and a chromium-plated metal bezel. It is compatible with Harmony XB4 This body fixing collar is pre-mounted with a contact block. Simply adding a head to this assembly will provide you with a complete ready-to-use push button. It protects operators from unexpected contact with live circuits thanks to its IP20 protection index. 1 million cycle high endurance provides less maintenance and damage in your installation. Its wide range of operating temperatures from -40°C to 70°C allows versatility in usage of product.