Sensata | Products: Klixon PS Series Thermal Circuit Breakers (PSA, PSM, PSM-N) by Sensata Technologies

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Site Updated July 25, 2008

Sensata > Products > Controls > Circuit Breakers > Thermal >

Klixon^® PS Series: PSA, PSM and PSM–N

2 to 35 Amp Precision Thermal Breakers

Using a bimetal, snap acting disc as the sensing and actuating element, the Klixon® PS Series thermal circuit breaker provides trouble free over current protection for harsh environments. The PS Series is used in applications such as military vehicles and equipment where precise ultimate trip characteristics are required. The PS series is available in three configurations:
•	PSA: Open construction, automatic reset
•	PSM: Sealed construction, manual reset
•	PSM–N: Sealed construction, manual reset, neck mount
Applications
•	Military vehicles and other equipment where precise ultimate trip characteristics are required
General Envelope Dimensions Nominal dimensions provided for reference only.

Above: PSM–N high amp

Above: PSA low amp

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Trip Curve
Approximate Time — Current Characteristics at 77°F (25°C)

Dotted Lines: PSA, PSM, PSM–N series (10 amps and below)
Solid Lines: PSA, PSM, PSM–N series (above 10 amps)

Derating Curve
Approximate Effect of Ambient Temperature on Ultimate Trip

Diagram: Approximate effect of ambient temperature on ultimate trip

Performance characteristics are based on room temperature (77°F). Consult derating curve at left for ambient temperatures significantly higher or lower than standard room temperature.

Example: At 77°F the device is calibrated to hold at 100% of rated current (1) and trip at 135% of rated current (2). At 140°F, the same device will hold at approximately 78% of rated current (3), and trip at approximately 115% of rated current (4).

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