CA3KN31BD Control Relay – 3NO/1NC, 10 A Contact Rating, 24 V dc. Creating seamless integration in all automation applications, compactness ratio and high performance, the TeSys K series is a range of reversing or non-reversing contactors. All 4 pole relays have 10A thermally rated contacts which are suitable for AC or DC control voltages. In addition the series also features low consumption coil versions with built in suppression which are suitable to be used with programmable controllers.