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There are 2 types of power supply:

1. Plastic case - suitable for domestic use, not intended for commercial use. Expected lifespan 2-5 yrs.

2. Metal case - suitable for domestic or commercial use. Expected lifespan 5-10 yrs. Waterproof.

 

Power supplies don't just "fail" like it's a manufacturing fault. There are several reasons why a power supply might stop working:

1. Power surge - fluctuating mains voltage, common in many suburbs. Every power supply contains a 'surge capacitor' as required by international standards. The sole job of this capacitor is to act as a fail-safe against power surges. This component blows to protect the device connected to the power supply. You should plug your power supply into a surge board to protect it. The most common cause of surges is fluorescent lights turning on or off. Compressors on fridges also can do it. If you have a power supply that stops working, there is a 80% chance it is due to a power surge. Should this happen to you, and you return the item to us, we will inspect it and if the surge capacitor has popped, you will need to buy another.

2. Overheating - the current rating on power supplies is a PEAK rating. This means, if for example a unit is rated at 2 amp, it will allow a load of 2A for around 30 secs. Normally, a long term load should be 50% of the rating (continuous load rating), so a 2A supply is good for 1A constant loads. beyond this, overheating occurs. The resin coating on the AC/AC transformer wire slowly bakes, until it ceases to protect the wire from it's other windings. A power supply can be luke warm, but never hot. The other way to overheat a power supply is to prevent it from dissipating heat. This includes covering it in insulation, exposing it to a hot summer ceiling, sunlight, or inadequate ventilation. Should this happen to your power supply, and you return the item to us, we will inspect it and if there is evidence of overheating, you will need to buy another. Metal case supplies are far better at dissipating heat.