The vast majority of circuit breaker failures are caused by improper operation of the breaker operating mechanism.
Several factors can affect proper circuit breaker trip operations:
The PS20 determines the minimum voltage and current (power) required to operate the circuit breaker. It is designed to plug into any 110VAC duplex outlet in the operating cabinet. The output is filtered with very low ripple and has adequate current to fully simulate the battery supply for tripping purposes.
To test an operating mechanism:
Note: DC voltage should only be applied to the trip coil momentarily. Extended energization time could damage the trip coil.
Ideally the breaker should be tested upon installation for later comparison. Any future deviation of operating minimums is cause for concern and the mechanism should be checked for abnormalities. If the minimum to operate is near the 50% nameplate rating, the operating mechanism is functioning properly.
Other uses for the PS20
The "heart" of the substation is the battery bank and charging system. The PS20 can also be used as an emergency battery charging system due to the isolated 20 amp continuous duty rating. It will function in this capacity for short periods while repairs to the charging system are expedited.
The PS20 is also ideal for determining minimums for DC motors, relays and auxiliary equipment, radio and general test bench power supply uses.
If you would like to download information about the PS-20, we have an informational booklet available for download in Adobe Acrobat format.
Don't have the right viewer for these files? The Acrobat viewer can be downloaded freely at the Adobe Web site.
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