Alarm push button by glass breakage, red color with alarm resistor of 470? for conventional systems. Design for an exclusive use indoor and surface mounting. Certified for its used in gas atmosphere in 0,1 and 2 zones and also in combustible dust environments, 20,21 and 22 zones. Includes a surface mounting box, protection cover and KG1 glass. For its integration in Analogical systems, requires a M710-CZR zone module. Requires a galavanic insulator AIS-GALD1 or a compatible zener barrier. Also available without resistor and NA/NC contact, ref.: WCP3A-RSG/ISC.