F21-4s
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F21-4S/4D Industrial Remote Controller
1. 4 buttons(D means double steps), spare button 2. 8 control contactors 3. With battery voltage warning device, the power supply is cut off during low power 4. Program the button function by computer interface 5. Up/down, east/west, can be programmed to interlock or non-interlock 6. The spare button can be programmed to start, toggle or normal, etc
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