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Delta Surge Suppressor (they call them Lightning
Arrestors)
Models Available:
- LA 302 DC - DC
Protector
- LA 302
- AC Single Phase 3 wire
- LA 303 R -
3 phase light duty 125 - 250V
- CA 302 R - AC
Protector Rated
Voltage - 250V single phase, three wire Voltage to neutral - 125V. An internal
automatic discharge circuit is provided.
- TA 304 Data line -
Two Pair, data line circuit protector w/separate ground. Max. Energy: 750
Joules per Line. Response Time: 5 Nanoseconds
DA302 DC
Design |
Silicon Oxide Varistor (SOV) |
Maximum Current |
60,000 Amps |
Maximum Energy |
2000 Joules per line |
Maximum Number of Surges |
Unlimited |
Response Time (1 mAmp test) |
5 nanoseconds |
Response Time to clamp 10,000 Amps |
10 nanoseconds |
Response Time to clamp 50,000 Amps |
25 nanoseconds |
Leak Current at Double rated Voltage |
None |
Leads |
18" #12 THHN |
Case Material |
PVC |
The basic design of the DELTA silicon oxide varistor (SOV) arrestor is a pair of
metal electrodes separated by a silicon oxide compound. Under normal conditions,
the silicon oxide is a good insulator so that no line current flows between the
electrodes to ground. When an excessively high voltage occurs on the electrodes,
the high energy electrical field ionizes the silicon oxide, changing it from a
compound to silicon separate from oxygen. Since the silicon ion is a good
conductor, the high energy current is conducted to ground. When the voltage
falls toward normal, the silicon and oxygen recombine, forming silicon oxide and
shutting off the conduction.
The DELTA silicon oxide varistor (SOV) arrestor has no spark gap. Valve
arrestors have a spark gap to prevent line leakage current and to determine the
spark-over voltage. Since the DELTA silicon arrestor conducts at the ionization
potential, no spark gap is needed. This is more effective because spark gaps
cause high-intensity voltage spikes which act as surges and damage electrical
equipment. The DELTA silicon oxide varistor (SOV) arrestor works equally well in
both directions.
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