Blue Sea Systems SPDT Remote Control ON-OFF-ON Contura Switch for ML Automatic Charging Relays Control switch for ML Automatic Charging Relays PN 7620,7622, 7621,7623 Vibration, shock, thermoshock, moisture and salt spray resistant IP 67- protected against immersion up to 1 meter for 30 minutes Meets UL 1500 and ISO 8846 external ignition protection requirements Pole Throw: SPDT. Action: ON-OFF-ON. () = Momentary