Quality first, customers first. Ji 宁浩博 mining equipment specializing in the production and sales of mining equipment protection switching products, adequate supply, complete model, low price, timely delivery, quality Three Guarantees, welcome to contact to discuss the industry, integrity is priceless, win-win cooperation . PIR-250 magnetic starter intelligent integrated protection device for magnetic starter mine, covering 380V, 660V, 1140V voltage rating, 5 ~ 250A rated current, all-digital tuning and calibration. With undervoltage | overvoltage | overload | short circuit | Unbalanced | leakage lockout protection; with fault memory and inquiries; with test functions via the menu. Mainly used to replace JDB-80/120/225 and similar analog protection. Functional, well-targeted, long-term stable and reliable operation. EMC tested and certified by the explosion center. ? Measurement of technical parameters 1, Rated current: 5 ~ 250A 2, Rated voltage: 36VAC 3, Rated frequency: 50Hz 4, measuring content: U, I, R 5, Accuracy: ± 3% 6, the switch input methods: optical an isolated environment, altitude not exceeding 2000m, pressure is 80kPa ~ 110kPa 2, the ambient temperature is -5 ℃ ~ + 55 ℃ 3, ambient air relative humidity less than 95% (+ 25 ℃ when) 4, no significant damage 5 gas insulated environment, local standards can be configured to prevent dripping PIR-250 (one) ????????????????????????? PIR-250D (points body)? Host a ????????????????????????????????? host a ???????? ??????????????????????????????????????? display a ???????? ??????????????????????????????????????? data line 1 on the introduction of this product here If you have any questions or want to purchase our products, please contact me Tel: 15589715136 Tel: 0537-2782188 QQ: 877995102 Company Website: http: //www.wgangdai.com welcome you to inquire, we look forward to your business cooperation to create a more beautiful tomorrow.