The SN450/1-A4-WR2 is a 230 V electronic flow switch with a G1/2 in process connection and a 48 mm insertion probe, rated 4 A and enclosed to IP67. It provides no-flow protection on liquid pipework where a paddle-type switch would be unsuitable. Applications include chilled-water circuits, cooling-tower lines, hydronic HVAC loops, and industrial process cooling.