HFD31/12-S HFD31/12-S(257) HFD31/12-S(258) HFD31/12-SR HFD31/12-SR(257) HFD31/12V HFD31/12VDC HFD31/2.4-L2(257) HFD31/2.4-L2S HFD31/2.4-L2S(257)