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| Part Number(DIP) | Part Number(SMD) | DC Spark-over Voltage（V） | 1KV/μs （V） | 8/20μs (1 time) （KA） | DC Holdover Voltage（V） | AC50Hz 1sec（A） | Insulation Resistance （GΩ） | Capacitance 1MHz（PF） | Impulse Life（10/1000μs）@100A | Data sheet |
| S51-70X | S50-70X | 70±20% | 800 | 10 | 10 | 52 | 10 | 1 | 300 |  |
| S51-75X | S50-75X | 75±20% | 800 | 10 | 10 | 52 | 1 | 1 | 300 | |
| S51-90X | S50-90X | 90±20% | 700 | 10 | 10 | 52 | 1 | 1 | 300 | |
| S51-150X | S50-150X | 150±20% | 700 | 10 | 10 | 52 | 1 | 1 | 300 | |
| S51-230X | S50-230X | 230±20% | 700 | 10 | 10 | 80 | 1 | 1 | 300 | |
| S51-250X | S50-250X | 250±20% | 700 | 10 | 10 | 80 | 1 | 1 | 300 | |
| S51-300X | S50-300X | 300±20% | 900 | 10 | 10 | 150 | 1 | 1 | 300 | |
| S51-350X | S50-350X | 350±20% | 900 | 10 | 10 | 150 | 1 | 1 | 300 | |
| S51-400X | S50-400X | 400±20% | 1000 | 10 | 10 | 150 | 1 | 1 | 300 | |
| S51-470X | S50-470X | 470±20% | 1100 | 10 | 10 | 150 | 1 | 1 | 300 | |
| S51-600X | S50-600X | 600±20% | 1500 | 10 | 10 | 150 | 1 | 1 | 300 | |
| S51-800X | S50-800X | 800±20% | 1700 | 10 | 10 | 150 | 1 | 1 | 300 | |
