WTR series Features: 1. Lead is not contained in the ceramic element, the terminations, the solder for inner connection and the coating resin. 2. Most suitable for power supplies of less than 100W 3. Excellent recovery characteristics due to resin coating with excellent heat characteristics 4. Wide resistance range 5. Highly reliable WTM series Features: 1. Wide resistance range 2. Cost-effective 3. Coating: epoxy resin, flame-retardant to UL 84 V-0 4. Tinned copper leads 5. Lead spacing 5.0mm