Fronius String Control 250/30 DCD DF - Manual (Page 60)

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(4) Terminals with fuse holders for DC 'IN' cables
Single-wire cable cross section 2.5 - 25 mm²
Multi-strand cable cross section 2.0 - 16 mm²
(5) Measuring channel 1
(6) Measuring channel 2
(7) Measuring channel 3
(8) Measuring channel 4
(9) Measuring channel 5
(10) DIN rail for fitting optional AC power pack
(11) DC circuit breaker
(12) DIN rail for fitting a standard overvoltage protection device
(13) RJ 45 connections for data communication cables
(14) Terminals for data communication cables
Max. cable cross-section 2.5 mm²