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  Introduction to Standard Number 1210, Revision 6
Inspection, Reconditioning and Testing of
Molded Case Circuit Breakers with Thermal Magnetic Trip Unit

Molded case circuit breakers, whether using thermal magnetic current sensing and tripping or solid state, are removed from service and at some point reapplied more than nearly any other type of electrical hardware. The greatest volume of these re-applications is completed with no shop or field testing performed. The needed for re-qualification to the extent possible is extreme. While manufacturer product is typically very robust and suitable for reuse under the proper circumstances, performance verification is critical prior to re-installation.

PEARL Standard 1210; Molded Case Circuit Breakers with Thermal Magnetic Trip Unit, begins with important clarifying notes, references to pertinent tables and a list of necessary test equipment to properly verify the performance of the device. The procedure begins with a detailed inspection of the case and all exterior parts, all internal parts and mechanisms and any accessories installed. Here we are looking for environmental effects from previous installation(s) and possible improper storage.

The PEARL reconditioning standards include "As Found" testing allowing a detailed assessment of the condition of the device prior to reconditioning. Testing includes Insulation Resistance which looks for insulation integrity, case integrity, presence of moisture in porous parts; Contact Resistance which determines condition of all parts that create or effect the current carrying path including all conductive parts, contact tensioners and springs, contact surfaces; thermal magnetic and instantaneous overcurrent trip testing is where the rubber meets the road. These tests determine if the device performs these protective functions within factory or industry accepted parameters.

Following the inspection and testing procedures, reconditioning is performed based on the needs of the individual breaker as determined in the initial round of testing. Here the breaker is disassembled, cleaned, polished, de-burred, lubricated, adjusted and parts replaced (if required) and then reassembled. A repeat of the inspection points and a second round of testing determine whether the device has been brought into compliance with the manufacturer or industry accepted performance parameters.

Finally, the application of the Blue reconditioning quality seal is affixed in testimony to this device being treated to and passing all necessary tests required by the referenced standard and will operate in a Safe and Reliable way as intended by the original equipment manufacture at the time it was made.

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