<Part No.>
55 = Series
3 = Type: Plug-in
4 = No. of poles: 4 pole, 7 A
9 = Coil version: DC
024 = Coil voltage: 24V DC
0 = Contact material: Standard AgNi
0 = Contact circuit: CO (nPDT)
4 = Options: Lockable test button + mechanical indicator
0 = Special versions: Standard
