What happens when a wall charger with multiple USB ports fails insulation tests at the UK border?

The charger that never made it to the warehouse

The product is a wall charger with several different USB connections. It carries model number RE-PD3506 and Amazon ASIN B0G52KTJB7. The manufacturer is listed as Chongzheng(HK) Co.Limited in China. Local Authority Trading Standards notified the Office for Product Safety and Standards under reference 2608-0115. The alert was published on 17 August 2026.

Inspectors examined the unit and measured the separation between the high‑voltage input side and the low‑voltage output side. The gap did not meet the creepage and clearance distances required by the Electrical Equipment (Safety) Regulations 2016. Because the insulation is too thin, voltage can arc across the boundary. That arc generates heat. Over time the heat can ignite the plastic housing or nearby materials.

The risk level was rated High. The corrective action recorded is import rejected at the border. No units entered the UK market. No recall of already‑sold stock was needed because the shipment was stopped before distribution.

Why the insulation gap creates fire

The charger steps down mains voltage to 5 V or 9 V for USB devices. The two circuits must be physically separated by a specific distance through air and along the surface of the circuit board. If the distance is too small, an electrical discharge can jump the gap. The discharge is not a single spark. It can repeat each time the charger is plugged in. Each event deposits energy into the surrounding plastic. The temperature rises. Eventually the material reaches its ignition point.

The regulations define minimum creepage and clearance values based on pollution degree and working voltage. The report states the product does not meet those requirements. It does not give the exact millimetre shortfall. It does not name the test laboratory. It does not say whether the design flaw is in the transformer or the optocoupler spacing.

What the border rejection changes for buyers

Since the shipment was refused entry, no consumer in the UK received this exact model from this Amazon listing. The ASIN B0G52KTJB7 will show as unavailable or removed. Anyone who already owns a charger that looks identical but came from a different batch or a different seller should check the model printed on the label. If it reads RE-PD3506, the same construction may be present. The report does not say how many units were in the rejected consignment. It does not say whether the manufacturer has corrected the design for future production.

What the notice does not cover

The document does not mention any injuries or fires linked to this model. It does not describe the test method used to discover the insulation defect. It does not state whether other models from Chongzheng(HK) Co.Limited were examined at the same time. It does not explain what happens to the rejected units — whether they are destroyed, returned to the exporter, or held for further testing.