The Utility Relay Co. B-291-MP Secondary Injection Test Set is a single-phase test set specifically designed for testing the operation of the AC-PRO-MPTM microcontroller based trip units manufactured by Utility Relay Co.
A plug-in, the AC-PRO-MP is , direct replacement trip unit for the STR trip units on the Merlin Gerin & Square D Masterpact MP breakers.
The Utility Relay Co. B-291-MP can test pick-up and time delays of the various protection functions by driving current into the AC-PRO-MP on the secondary side of the CT circuit.
The B-291-MP will test AC-PRO-MP trip units programmed for 60 or 50 Hertz operation, and the AC-PRO-MP trip system with the exception of the CTs and associated wiring harness.
The Utility Relay Co. B-292 Secondary Injection Test Set is a single-phase test set specifically designed for testing the operation of the AC-PRO and AC-PRO-II micro-controller based trip units manufactured by Utility Relay Co.
Test pick-up and time delays of the various protection functions, with the Utility Relay Co. B-292 by driving current into the trip unit on the secondary side of the CT circuit.
The B-292 will test 60, 50, 40 or 25 Hertz AC-PRO trip units. (The AC-PRO-II can be set for either 50 Hertz or 60 Hertz), and the AC-PRO or AC-PRO-II trip system with the exception of the CTs and associated wiring harness.
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