Contacts Silver or gold-plated contacts. Epoxy resin case Self-extinguishing epoxy. Actuator style Over 30 actuator variations. Insulation between terminal and ground: 4 mm minimum. Prevention of flux entry The epoxy resin seal on bottom of the switch helps prevent the entry of solder and flux Insulation barrier: Insulation barrier design between poles helps prevent short-circuiting between poles ensuring high reliability.