HTS-16-230-100-3/6.3 PTC HTS-16-230-300-3/6.3 HTS-16-230-300-3/6.3 PTC HTS-16-230-500-3/6.3 HTS-16-230-500-3/6.3 PTC HTS186-U HT-S191NB5 HTS191-P HT-S193NG HT-S19NV-276