When comparing a hybrid design surge protection device (SPD) to a single-type component version, there are a few general (and some specific) advantages. The statement "The whole is greater than the sum of the parts" comes into play for a properly engineered SPD. Case in point: The gas discharge tube (GDT)/metal oxide varistor (MOV) hybrid circuit compares favorably to the MOV-only design. The GDT acts as a support to the MOV, allowing the SPD to successfully divert higher amplitude spikes, as well as larger power surges, with considerably less degradation than an MOV-only type could handle. The MOV reacts first, diverting the initial spike safely to ground. The GDT diverts all energy beyond the MOV maximum.
Enhanced Durability and Safety: The Real-World Benefits of Hybrid SPDs
This is important since repetitive strikes are a common occurrence today. It also allows for longer warranty periods and greatly decreases the likelihood of equipment damage due to multiple spikes. Another advantage of this type of hybrid design is increased safety. High Short-Circuit Current Ratings (SCCR) ratings and best-in-the-industry nominal discharge ratings are a direct result of the Gas Discharge Tube/Metal Oxide Varistor hybrid design.
Addressing VPR Concerns: Why UL1449 Testing Doesn’t Tell the Whole Story
The only supposed drawback to this specific hybrid design is that it may increase the Voltage Protection Rating in UL1449 testing. There are two rebuttals to be had here. First, the testing is conducted with a particular waveform that is considered "representative," but it is by no means common in the real world. The bottom line is that the GDT/MOV hybrid design employed by RectorSeal has been proven effective for years in real-world scenarios. This is supported by the almost nonexistent number of warranty returns and damage claims we have observed.
The ITIC (Information Technology Industry Council) Curve, developed by the Computer and Business Equipment Manufacturers Association (CBEMA), was initially used to verify performance on mainframe computers but has since expanded to a broader range of business equipment. In short (no pun intended), most Printed Circuit Board-operated equipment can withstand several hundred volts for a brief period without obvious damage. Since SPDs operate in nanoseconds and spikes travel in microseconds, a device that has millisecond withstand is in pretty good shape.
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