This Harmony XB4, single contact block is pre-assembled on a body/collar fixing unit.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.