RTU Transient Protector
The Model 2261 is an in-line device to protect the power supply and communication wiring of a device that communicates via 2 or 4-wire RS-485. This 3-level suppression circuit is designed to prevent costly damage to the attached equipment.
Each communication line signal is limited to 12 volts by individual 1500 watt TransZorbs®, while the 12 volt battery lines are limited by individual 18 volt 1400 watt TransZorbs® to cover light and medium transients. All 6 lines are additionally protected against highly powerful transients by high current SIDACtors® responding within nanoseconds to levels above 25 volts by a full bypass to ground. This bypass will stop as the transient fades out and the minimum holding current across the SIDACtor® is no longer supported. A third level of protection is assured by six self resetting solid state fuses designed to open circuit the bypass after the transient subsides, thus preventing a bypass overload to the power supply.
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