AL-S series limit switches feature a forced contact opening mechanism. Under abnormal conditions, the mechanism forces the contacts open to prevent pitting and fusing. Gold-plated silver contacts with scrubbing action have high reliability. The K244 series is provided with four different kinds of contact operating actions: standard normal stroke, snap action, make-before-break, and extended stroke. Features: Insulation resistance: Over 100MΩ at 500V DC Dielectric strength: 2500V AC rms 1 minute Max. operating cycle: 3000 cycles/h Life expentancyMechanical: 10 million operationsElectrical:K244-2, 2U and 2V3.3 million operations at 24 to 550V AC 3AK244-2S1.3 million operations at 24 to 550V AC 3A