Title: +038=365.008-SS002._04-mcr WIPT Stengespjeld Mercor - Teknisk og operativ dokumentasjon.pdf
Figure 16. Fire damper with thermal trip - RST mechanism: 1) hook fixed to the casing, 2) fusible link, 3) hook fixed on the baffle, 4) baffle of the damper, 5) casing.Independent limit switches of fire dampers – for RST execution WK1 – single switch – signalling the fire damper baffle closed state. WK2 – set of two switches – signalling the fire damper baffle closed and open state.Switch technical data Limit switch WK1 and WK2 Operating temperature of the limit switch Service live Voltage Current Head execution Protection degree1NO/1NC SPDT (change-over contact) -40°C to +85°C 10,000,000 cycles 600V AC and 250V DC 10A „steel roller” IP66Electrical connections diagram for limit switches: WK1 – one limit switch signalling the fire damper closingNO type (normally open) • NC type (normally closed)WK2 – two limit switches signalling the fire damper opening and closingTop switch • NO type (normally open) • NC type (normally closed) Bottom switch • NO type (normally open) • NC type (normally closed)