20-39 tilt switches (optional SL20-30): 20-39 tilt switches can be used individually or in conjunction with 20-38 controllers, standard 20-38 controls, NEMA4X. housing protection rating There are indicator lights in front, green is normal, red is alarm. The adjustable time delay line of 0-6 seconds can avoid the misoperation caused by the instant tilt of the tilt switch. Two normally open and close output contacts are used to connect external alarm or control; interruption of line power will cause relay action! Features: Easy to install, Strong corrosion resistance; The 20-38 controller is a printed circuit board structure; Adjustable delay to prevent maloperation; Product performance has been confirmed by thousands of applications in the world. Technical specifications: rated contact :1 A/24v( no inductive load) Rated temperature: Standard-30℃~85℃; Special 80℃~200(20-39 C heat resistant)