In a house or building, the personal safety of the mains voltage is regulated by means of an earth leakage circuit breaker in combination with an earth pin. That is obvious for everyone. But what if you use an alternating current generator, such as a DC-AC inverter or generator? After all, these devices also generate 230VAC.

Floating grid system
The situation when using an alternating current generator is different. A device such as an inverter, generator, etc. is a so-called floating grid. This requires a different approach, in terms of personal safety, than in a normal situation, such as in a building. However, this does not release you from the obligation to ensure the safety of the people who work with the inverter/generator. 

Mobile units
Inverters and generators are often used in mobile/movable units, such as mobile workshops (commercial vehicles), market trucks, fire trucks and mobile canteens. As long as the 230VAC is only used in the unit, a special (expensive) RCD (class B) can be used. However, if you bring the 230VAC voltage outside or if you go to work outside the unit with the connected devices, there is only one correct solution to work 100% safely. This is a so-called insulation guard. An RCD (no type) is not sufficient in this situation! An insulation monitor is simply mounted between the 230VAC output of the AC generator and the consumers.

If an accident occurs because there is no insulation monitor present, this has very serious consequences. The 230VAC will not be switched off if someone comes into contact with it. In addition, the responsibility of the owner of the unit and of the installer comes in. With the installation of only one device, the whole issue of personal safety has been resolved with this. An insulation guard is also the only device that provides full coverage, both inside and outside the unit.

Other application situations
The above standard applies to vehicles and mobile/movable units that are used commercially. Caravans, motorhomes, etc. are not covered by the legal obligation, but the circumstances are identical. Relatively new, emerging applications of inverters are beach houses, 'tiny' houses, garden houses, etc. This is not a mobile unit. Because an earth pin cannot be used since one is dealing with a floating system, an insulation guard is also a ready-made safe solution here.

Five standard models
Our standard range consists of five models, all of which work entirely in accordance with the NEN1010 regulations.
- ISO 230-16 and ISO 230-25 with fixed cables, perfect for flush mounting.
- ISO 230-16PP (plug and play) has a WCD output to which the consumer can be connected directly.
- ISO 230-16C and ISO 230-25C: necessary if the insulation guard is to be used with a COMBI device (inverter and battery charger in one).

Customer specification
We can also build our insulation guard on customer specifications. For example in higher capacities, a different alternating voltage and, for example, with one or more built-in circuit breakers. We are happy to assist you to further discuss your requirements. Take a look at our portfolio. There you will see some examples of customer-specific insulation guards we have built.

Our value labels
Our value labels
Our value labels
Our value labels


Article no.System voltageMax. loadDimensionsWeight
ISO 230-16230Vac16Amp. (3650Watt)12,2x12x8,6 cm
1,1 kg 
ISO 230-16PP230Vac16Amp. (3650Watt)12,2x12x8,6 cm
0,9 kg
ISO 230-16C230Vac16Amp. (3650Watt)12,2x12x8,6 cm
1,2 kg
ISO 230-25230Vac25Amp. (5750Watt)12,2x12x8,6 cm
1,1 kg
ISO 230-25C230Vac25Amp. (5750Watt)12,2x12x8,6 cm
1,2 kg


EN - Leaflet ISO-series.pdf > Download
ENG- Connection diagram ISO-series.pdf > Download
NL-EN-DE - Manual ISO-series V1.9.pdf > Download
ENG - Specifications ISO-series V3.pdf > Download




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