Electric power

Circuit Breakers

A separate chapter on circuit breakers (CB)? Actually, one should think these are standard products and not worth mentioning. Unfortunately, the proper choice of CB’s encountered unexpected problems. In the boot sector, several automatic fuses are offered that do not appear to be trustworthy at first sight. Currents up to 60 A should be fusible. It comes with cable junction of a tiny M 6 thread. This screw fixes the cables, but high currents will heat up this CB badly. A review by a major American online retailer revealed that this CB should not be installed at all. The reviewer warned of the enormous heat under load. Since in smaller photo-voltaic systems the same necessities prevail to protect the installation, I found a warning notice on the web page of a craftsman who put a melted CB online as “photo evidence”. The customer was lucky his house did not burn down.

To make a long story short, even at lower loads, some CBs convert electrical energy into useless heat; and if you are unlucky, they trigger a fire.

The DC circuit breakers installed in ATHENE are mainly used in photovoltaic with low power dissipation! (Schrack company)

Appliance leakage current interrupter (ALCI)

The shore power connection is protected by an ALCI. Since the MultiPlus operates completely the entire 230 V system within the boat, it has a special ALCI (type A) on the output side, protected by 230 V fuses.

A separate box houses all 12 V fuses for the entire onboard network. Higher loads are switched directly via circuit breakers with low losses: Cooler, autopilot, heating, sewage pump, chart table – navigation.