PWT® Transformers Used to operate multi-combinations of fixtures. EL-154 EL-154 (Box Mount) 120 VAC Input/24 VAC Output, 50/60 Hz, 50 VA EL-208 PWT System 100 VA Transformer. Foot-Mount Transformer designed for use with PWT Systems. EL-386 Transformer 6 VAC EL-451 Transformer 6V 25 VA MCR-426 PWT System 24 VAC/50 VA Plug-In Transformer. Class 2 Transformer MCR-427 PWT System 24 VAC/100 VA Plug-In Transformer. Class 2 Step-Down Transformer