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New/used (very clean and no oil residue makes me think its never been used) , old stock. Qualitrol Rapid Pressure Rise Relay 900-003-01. The Qualitrol Rapid Pressure Rise Relay (RPRR) is used worldwide as the standard to provide transformer protection signals to the protective relay system during the occurrence of a potentially destructive overpressure event. The device looks at the rate of pressure increase, and sends a signal if a rate exceeding a safe threshold is detected. The 900 is designed for mounting |