Guides
Guides to IEC breakers and contactors
Plain answers to the questions US engineers ask when a European breaker or contactor fails and the manufacturer has moved on. Written by the workshop that repairs them.
Masterpact M end of life: repair or replace?
Obsolete since 2003. The OEM's MTZ-in-old-chassis retrofit against repairing the original breaker, and how to decide.
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Can a TeSys F (LC1F) contactor be repaired?
Schneider's position, what a workshop repair involves, and the test results that prove it.
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Emax PR121 / PR122 / PR123 trip unit faults
Blank displays, alarms, nuisance trips and failed tests, and what ABB's test units can and can't prove.
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Siemens 3WL vs 3WA: why the trip units don't swap
Why a 3WA trip unit won't rescue a 3WL, and what repairing a 3WL in place involves.
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