PHFX-A 1kV PHFX-A 1kV Class 5 PHFX-A 3kV EMC PHFX-AFR 1kV PHFX-U 1kV PHFX-U 1kV Class 5 PHFX-UFR 1kV THFX-C 250V THFX-U(c) 250V