Circuit breakers are commonly found in homes, industrial facilities and power substations. They can be used to protect the power line from reversal, overload, earth fault, and over current conditions. This protective device is preferred over fuses. These power interrupters can be reset and reused for future use which makes it cheaper because you do not need to replace it every time it trips. However, poor maintenance can damage it, which can cause problems in the power line.
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 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 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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