Dwyer Series A1F Series Pressure Switch, Open Housing, 316 Stainless Steel Chamber, One SPDT Switch, 2-15 psi Range The Series A1F Compact OEM Pressure Switch is ideal for panel mounting wherever a high-quality, economical open-case or weatherproof control is required. Switch Type: SPDT snap switch. Electrical Rating: 15A @ 120/240/480 VAC, 1/8 HP @ 125 VAC, 1/4 HP @ 250 VAC. Electrical Connection: Screw terminals. Mounting Orientation: Within 20 of vertical.