Shore Power

Isolating transformer

Isolating transformer with an electric potential 230/230 V allows a galvanic isolation of the shore power supply. To operate a network on board with 115 V by a shore power supply of 230 V, an electric transformer of 230/115 V is required. To operate an optional network with an electric potential of 115 V or 230 V on board a selector switch is used to divide the shore power supply.

 

Galvanic Corrosion (Elektrolysis)


Corrosion is an ever present fact of life with boats. The mixing of salt water and different metals is enough to cause galvanic corrosion. All metals when immersed in an electrically conductive fluid (called electrolyte) have a specific electrical potential. Given any two metals immersed in an electrolyte, when an electrical connection is made between them, the current flows from the higher-voltage metal to the lower-voltage metal. The current flowing through the electrolyte is generated by an electrochemical reaction that steadily consumes the lower-voltage metal (galvanic corrosion). This process will continue until the metal with the lowest potential is used up. Corrosion will occur, even if the metals are on different vessels. With the shore power based electrical system we have a further nature of galvanic corrosion. Many of these pass galvanic currents from one boat to another, or to the dockside, down the grounding wire (green/yellow) of the AC shore power cord. This kind of galvanic couple is easily broken with an isolation transformer on-board. The best solution is to install an isolation transformer, which will ensure the shore power connection is grounded without the grounding wire actually touching the boat. Sacrificial anodes can extend the life of the vessels hull, engine, rudder, propeller shaft, engine cooling system, refrigeration condenser and other components by protecting them from the deterioration caused galvanic corrosion.

RTR 25 230/230

RTR25 RTR36 RTR

Isolating transformer RTR, housing by salt water resistant aluminium with a plastic coating as surface protection for galvanic isolation of the shore power supply. To operate a network on board with 115 V by a shore power voltage of 230V a transformer of 230/115V is required and the other way round. Included is an inrush current limiter.

RTR 252500 W nominal power, weight 21 kg
RTR 363600 W nominal power, weight 27 kg
DimensionsL 410 x W 290 x H 170

 

 

 


RTR 25 230/230 Order-no.: 060252323


RTR 25 115/230 Order-no.: 060251123


RTR 36 115/230 Order-no.: 060361123


RTR 36 230/230 Order-no.: 060362323


RTR 25 230/115 Order-no.: 060252311


RTR 36 230/115 Order-no.: 060362311



Info Manual

RTR 25 115-230/230

RTR25 RTR36 RTR

Isolating transformer RTR, housing by salt water resistant aluminium with a plastic coating as surface protection for galvanic isolation of the shore power supply.

With a switch to choose the input voltage between 115 V and 230 V.

Included is an inrush current limiter.

RTR 252500 W nominal power, weight 21 kg
RTR 363600 W nominal power, weight 27 kg
Input voltage115V or 230V
Output voltage230V
DimensionsL 410 x W 290 x H 170 

 

 


RTR 25 115-230/230 Order-no.: 060251223


RTR 36 115-230/230 Order-no.: 060361223



Info Manual

GI

GI16 GI32

To avoid galvanic currents between the hull and the shore power, a galvanic isolator can be used. Two anti-parallel diodes in the line produces a drop voltage enough to avoid galvanic currents.

  • The galvanic isolator is also suited for yachts with a GRP hull to avoid galvanic corrosion caused by the shore power connection to the propulsion.
  • Waterproof sealed electronics in anodized aluminium housing
Nominal current16 A
Peak current1600 A (20ms)
Connection terminals 2 x M6
Dimensions 200 x 120 x 60 mm
Weight 1 kg

 

 

 


GI 16 Order-no.: 700090016


GI 32 Order-no.: 700090032



Info Manual