SE 160 1. 60 A Range of application PTC elements Loudspeaker Size Power Minimum Average Maximum Tweeter 10 mm 100W SE050 SE065 SE090 Midrange 100-130 mm 50-100W SE065 SE090 SE110 Midrange Hifi & PA >100W SE010 SE020 SE030 Woofer 25 mm 40-60W SE110 SE135 SE160 Woofer 32-42 mm 60W SE135 SE250 SE375 Ih: Holding current Pd: Power output in switched condition R: Typical resistance in unswitched condition Is: 1. 5 * Ih (20° C) Switching back at Uo2/4 * RL < Pd Uo: Terminal voltage Rl: Value of load resistance