rolling ball switch , rolling ball sensor switch , vibration switch . normal close, vibrate open Rolling ball siwtch , rolling ball sensor switch , vibration switch 1. Rating: 0.3A 250V AC 2. Contact resistance: 30m Ω max.3. Insulation Resistance: 100M Ω at 500V DC4. Withstand Voltage: AC 1500V for 1 minute5. Temperature: -25oC~70oC rolling ball switches