Model No: FDH 4520 R

R Radio
Electronic Memory Limit + Built in Receiver + Resistence & Stop Functions + Light touch-start function + Power Off Manual Function + External Dry Contact Switch Function
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Model No: FDH 7520 S

S: Standard
Electronic Memory Limit + Resistence & Stop Functions + Power On & Off Manual Function + External Heavy Current Switch Function
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Model No: FDH 7520 R

R:Radio
Electronic Memory Limit + Built-in Receiver + Resistence & Stop Functions + Light touch-start function Power Off Manual Function External Dry Contact Switch Function
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Model No: FDH 4520 S

S:Standard
Electronic Memory Limit + Resistence & Stop Functions + Power On & Off Manual Function + External Heavy Current Switch Function
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