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Xenteq Isolation Monitor 230Vac 25A
Xenteq Isolation Monitor 230Vac 25A
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The Xenteq ISG 230-25 is an insulation safeguard for 230V installations with a floating supply system (such as with an inverter or generator). The device continuously monitors the insulation resistance and automatically switches off the 230V output in the event of a phase-to-earth or neutral-to-earth fault.
What is an insulation safeguard?
In a residential building, personal safety is ensured by a residual current circuit breaker (RCD) and an earth pin. With an inverter/generator, a floating supply is often created. This requires a different approach.
What exactly does the ISG 230-25 do?
- Continuously monitors the insulation resistance of the 230V system.
- Provides an advance warning when insulation deteriorates (alarm 1).
- Switches off the output as soon as the insulation resistance becomes too low (alarm 2).
According to the manual, the insulation safeguard replaces the residual current circuit breaker in a floating supply, which cannot/may not be used there.
This product is for personal safety with 230V from an inverter/generator. Always have the installation carried out by a qualified technician.
When do you need this in a camper?
- If you generate 230V with an inverter or combi (e.g. Victron MultiPlus) and also feed the 230V “outside” or to multiple sockets.
- If you have a floating 230V supply and want to technically ensure your personal safety.
- If your installation works on both shore power and inverter power and you want to separate them properly.
Why the ISG 230-25 (25A) in particular?
- Suitable for heavier 230V installations up to 25A (max. approx. 5750W).
- According to Xenteq, this model is also suitable for combi devices and systems with priority/transfer (such as inverter/charger combinations).
Connecting to a Victron MultiPlus (combi inverter/charger)
In a camper with a MultiPlus, you usually have 2 situations: inverter operation (230V from the battery) and shore power operation. The ISG 230-25 is intended to ensure personal safety with a floating 230V supply (inverter operation without shore power). As soon as shore power is active, the measurement is switched off via MAINS detection.
Important guidelines (practical)
- Place the insulation safeguard between the AC-out of the MultiPlus and your 230V distribution (circuit breakers / socket groups).
- Preferably connect the insulation safeguard as directly as possible to the MultiPlus (i.e. before other peripheral equipment).
- For this 25A model, use a 3-core 2.5 mm² mains cable for INVERTER and OUTPUT (according to Xenteq guidelines).
- Lay an additional 2-core MAINS detection cable (0.75–1.5 mm²) and connect it to the same shore power supply as the MultiPlus (after your RCD/circuit breaker after the CEE input).
Shore power present (also with PowerAssist)
When shore power is present, the ISG is in “mains present” mode and the insulation measurement is switched off. This also applies if the MultiPlus uses PowerAssist (supplementing shore power with battery power).
- Personal safety is then ensured via the shore power RCD (camping site/post) and your own shore power protection in the camper.
- As soon as shore power is lost, the ISG starts measuring again (after a self-test).
Important: N–PE connection in MultiPlus (for correct ISG operation)
The Victron MultiPlus often standardly connects neutral and earth (N–PE) when the inverter is in operation and no shore power is present. For the Xenteq ISG to work correctly, the 230V output must correctly form a floating supply during off-grid inverter operation.
- Therefore, disable the function in the MultiPlus settings that links N–PE during inverter operation without shore power.
- You can then check off-grid whether the supply is “floating” (indicatively, you will often measure approximately ~115Vac from L to PE and from N to PE).
Unsure about the setting or the measurements? Contact us; incorrect settings can cause unexpected behavior in your 230V network.
Note: when shore power is active, the shore power installation (post + your camper input) must be equipped with a properly functioning residual current protection. The ISG is intended for personal safety with the floating supply in inverter operation (without shore power).
Mounting & installation (short and practical)
- Only by qualified technicians; and only one insulation safeguard may be connected per supply system.
- Mount it as close as possible to the inverter/combi and keep the cable between the inverter and ISG as short as possible.
- Secure it to a flat, stable surface and prevent vibration/shock.
- IP66 enclosure: resistant to dust and water, but always mount it neatly and without mechanical strain on the cable glands.
Test: is your 230V output “floating”?
According to the manual, you check this with a multimeter by measuring from L to earth and N to earth. With a floating supply, you measure approximately 115 Vac on both (indicatively). If that is not correct, the source may need to be adjusted (e.g. no fixed connection between N and earth).
Prevent overloading
Xenteq advises placing a fuse on the output for protection against overloading, suitable for the maximum power of the model.
Fuse value and execution depend on your 230V distribution network (circuit breaker cabinet, cable thicknesses, socket groups). We are happy to help you with this.
Operation, LED status and testing
After switching on, the ISG first performs a self-test. Only after that is the output switched through. Allow for a delay of approximately 10 seconds.
Alarm levels
- Alarm 1 (advance warning): at 46 kΩ (LED flashing red). Check the system for faults.
- Alarm 2 (switch off): at 23 kΩ (LED red). Output is switched off.
LED status (summary)
- Flashing green: self-test active
- Green: everything is OK, output active via inverter/generator
- White: shore power active, measurement switched off
- Flashing red: advance warning (alarm 1)
- Red: output switched off (alarm 2)
- Flashing red/green: self-test unsuccessful (contact Xenteq)
Monthly self-test (recommended)
- Press Test → the ISG creates a fault and switches off.
- Then press Reset → self-test again, then active again if everything is OK.
The ISG can automatically reset when the power source is switched on again, or manually via the reset button.
Specifications (ISG 230-25)
- Model: ISG 230-25
- Mains voltage: 180–250 Vac
- Frequency: 50/60 Hz
- Max. output power: approx. 5750 W
- Max. output current: 25 A
- Advance warning (alarm 1): 46 kΩ
- Switch off (alarm 2): 23 kΩ
- Suitable for combination with mains voltage: yes
- External signal at alarm 1: yes (n.o. or n.c.)
- Operating temperature: -25°C to +50°C
- IP rating: IP66
- Connections: input via M20 cable gland, output via M20 cable gland, MAINS detection via M20 cable gland
- Weight: approx. 0.45 kg
Specifications according to Xenteq ISG series manual / datasheet.
Why via Faraday Energy?
- We often combine this product with Victron MultiPlus installations and know where things can go wrong in practice (detection, order in the 230V chain, distribution).
- Quick check on your diagram: “where exactly should it go between” and “how to connect MAINS detection correctly”.
- We help you think about a neat 230V distribution: circuit breakers, socket groups and fuses suitable for your set-up.
Need help with connection?
Send us this, so we can help you specifically:
- Which device generates 230V: MultiPlus model (e.g. 12/1600, 12/3000, 24/3000) or other inverter
- A photo or sketch of your 230V distribution (shore power → MultiPlus → groups/sockets)
- How you use the 230V: only indoors, or also outdoors/externally
