The Europa Solar Guardian PVADD04X is a 4-pole, 2-string PV Automatic Disconnect Device designed to protect rooftop solar installations during emergencies, grid failures, and fire events. Rated to 1500 Vdc with a switch interrupt rating of 38 A and a continuous string capacity of 55 A, this device monitors the building's 230 Vac supply and automatically isolates both DC strings from the array the moment grid power is interrupted. Supplied in a robust IP66-rated enclosure with a built-in thermal shut-down sensor, waterproof vent valve, and slide-out surface-mounting plates, the Solar Guardian gives first responders, installers, and building owners a certified rapid-shutdown solution that is TUV, CE, CB and SAA approved.
1500 Vdc
Max String Voltage
38 A
Switch Interrupt Rating
+70°C
Thermal Auto-Shutdown
4-Pole / 2-String
Configuration
INSTALLER — SAFETY CRITICAL
The Solar Guardian monitors the 230 Vac mains supply to trigger automatic DC isolation. The AC supply connection must always be made before commissioning the DC side. Failure to connect the AC control circuit will prevent automatic disconnection in an emergency. Installation must comply with BS 7671 (18th Edition) and any relevant local wiring regulations. All connections must be checked for correct tightness before energisation. Do not use power tools on these products.
COMPATIBILITY NOTE
The PVADD04X is rated for systems with a maximum string voltage of 1500 Vdc and a continuous string current up to 55 A per string. Verify that the combined short-circuit current (Isc) of your array does not exceed 55 A per string. The switch interrupt rating is 38 A at PV1 duty; for higher fault currents, consult Europa's technical team before specifying. Operating environment must remain between −20°C and +50°C — do not install in locations subject to sustained temperatures above this range without supplementary thermal management.
PART OF THE SOLAR GUARDIAN RANGE
The PVADD04X sits within Europa's complete Solar Guardian family, scaling from 2-pole / 1-string (PVADD02X) up to 10-pole / 5-string (PVADD10X). All share the same proven automatic-disconnect circuit, certifications, and enclosure platform — making it straightforward to specify the correct device for any residential or commercial array size.
Automatic AC-Triggered Isolation
The device continuously monitors the 230 Vac mains supply. When grid power is interrupted — whether by firefighters cutting the main switch or an unplanned blackout — the Solar Guardian automatically opens the DC contacts, de-energising the roof array and all descending DC cables. This removes the live-voltage hazard that otherwise persists on PV wiring even after AC isolation.
1500 Vdc String Voltage Rating
With a string voltage range of 300–1500 Vdc, the Solar Guardian is fully compatible with today's high-efficiency monocrystalline and bifacial modules that operate at elevated string voltages. The PV1-category isolator and its TUV-certified DC switching mechanism are engineered to safely interrupt high-voltage DC arcs that would otherwise sustain in conventional AC-rated switchgear.
Built-In Thermal Protection
An integrated temperature sensor monitors internal enclosure temperature and triggers automatic system shutdown if 70°C is reached. This protects against runaway heating from sustained fault currents or direct solar gain on the enclosure body — a critical safeguard in south-facing roof-mounted installations where enclosure temperatures can climb significantly above ambient.
IP66 Enclosure with Anti-Condensation Vent
The IP66-rated enclosure provides complete protection against powerful water jets and dust ingress, making it suitable for direct external mounting. A waterproof vent valve allows the enclosure to breathe — equalising pressure with ambient air — without admitting moisture. This prevents damaging condensation on internal electronics and contacts during temperature cycling in outdoor installations.
TUV, CE, CB & SAA Certified
The integral isolation switch carries TUV, CE, CB and SAA certification, confirming compliance with international safety standards. TUV approval in particular provides independent verification of the DC switching performance — essential for PV systems where inferior DC switchgear can fail to extinguish arcs at high voltage. CE marking confirms conformity with applicable European directives for the UK and EU markets.
Quick Surface Mounting Design
Concealed slide-out mounting plates on both sides of the back lid allow rapid, tool-free positioning against any flat surface before fixing. No specialist brackets or separate back-boxes are required. This means a single installer can locate, mark, drill and secure the unit quickly, reducing installation time and ensuring a neat, professional finish on external walls or roof-level structures.
Technical Specification
| Identification |
| Part Number (MPN) |
PVADD04X |
| Description |
Solar Guardian PV Automatic Disconnect Device — 4 Pole, 2 Strings |
| EAN |
5056551235304 |
| ETIM Class |
EC001056 |
| DC Electrical Ratings |
| String Voltage Range |
300–1500 Vdc |
| Max Circuit Voltage |
1500 Vdc |
| Switch Interrupt Rating |
38 A (PV1 duty) |
| Max Continuous String Current |
55 A per string |
| Number of Strings / Poles |
2 strings / 4 poles |
| AC Control Supply |
| Working Voltage Range |
100–270 Vac |
| Rated Voltage |
230 Vac |
| Rated Current |
30 mA |
| Starting / Loading Current |
100 mA (average) |
| Max Action Current |
300 mA |
| Environmental & Mechanical |
| Operating Temperature |
−20°C to +50°C |
| Thermal Auto-Shutdown Threshold |
+70°C (internal enclosure) |
| Storage Temperature |
−40°C to +85°C |
| Protection Rating |
IP66 |
| Overvoltage Protection Category |
Category II |
| Mechanical Life (no-load) |
10,000 cycles |
| On-Load Operations (PV1) |
1,500 cycles |
| Certifications |
| Isolation Switch Approvals |
TUV, CE, CB, SAA |
| Suitable Applications |
Residential, commercial and industrial PV systems |
Frequently Asked Questions
How does the Solar Guardian PVADD04X automatically disconnect the PV array?
The device monitors the 230 Vac mains supply through its built-in AC control circuit. While grid power is present, the internal relay holds the DC contacts closed, allowing normal solar production. If the AC supply is interrupted — for example when a firefighter operates the main isolator, or during a power cut — the relay releases and the DC contacts open automatically, isolating both strings from the downstream cabling and inverter. No manual action at the Solar Guardian itself is required.
What is the difference between the 38 A and 55 A current figures?
These refer to two different electrical ratings. The 38 A figure is the switch interrupt rating under PV1 duty — the maximum current the internal isolating switch can safely break (interrupt) when the contacts open under load. The 55 A figure is the maximum continuous string current — the highest current that can flow through the terminals and wiring in normal operating conditions. Ensure your array's short-circuit current (Isc) does not exceed 55 A per string, and that the expected fault current at disconnection does not exceed 38 A.
What triggers the thermal auto-shutdown, and does the system restart automatically?
The integrated temperature sensor continuously measures the internal enclosure temperature. If this reaches +70°C, the device automatically shuts down to protect against thermal damage to internal components. Since the Solar Guardian uses a relay held closed by the AC supply, restoring normal operating temperatures and ensuring the AC supply is stable will allow the contacts to close again. Persistent thermal shutdowns should be investigated — they may indicate a wiring fault, excessive sustained current, or inadequate ventilation around the enclosure.
Why is the waterproof vent valve important in an outdoor installation?
In an IP66-sealed enclosure, rapid temperature changes — such as a cold night following a warm sunny day — create a pressure differential that can draw moisture-laden air inward through any tiny unsealed path. The waterproof vent valve allows the enclosure to equalise internal and external air pressure without permitting liquid water or dust ingress. This prevents condensation forming on internal PCBs and contacts, which could cause tracking, corrosion, or relay malfunction over the lifetime of the installation.
Which other Solar Guardian models are available if my system has more or fewer strings?
Europa's Solar Guardian range covers from one to five strings. Select by the number of PV strings in your installation:
| MPN |
Poles |
Strings |
| PVADD02X |
2 |
1 |
| PVADD04X |
4 |
2 — this product |
| PVADD06X |
6 |
3 |
| PVADD08X |
8 |
4 |
| PVADD10X |
10 |
5 |
All variants share the same 1500 Vdc, IP66, and TUV/CE/CB/SAA specification. The 1- and 2-string models use a smaller enclosure footprint than the 3–5-string variants.
Does the Solar Guardian replace the need for a separate DC isolator at the inverter?
The Solar Guardian is an automatic rapid shutdown / emergency disconnect device and is typically installed at or near the array — not as a substitute for the manual DC isolator required at the inverter under BS 7671 and MCS installation standards. A manual DC isolator at the inverter remains necessary for routine maintenance isolation. The Solar Guardian adds an additional layer of automatic emergency isolation that operates independently of any manual intervention, specifically addressing the scenario where first responders or fire services need to make the roof safe rapidly.
