Sensata | Products: Klixon 7851 and 7854 Series Thermal Circuit Breakers by Sensata Technologies

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Thermal Circuit Breakers

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Products

–	Commercial Breakers:
		2–40 Amp C Series
		12.5–60 Amp 7851, 7854
		35–150 Amp F Series
		35–150 Amp 6766–19
		35–150 Amp S Series
		175–200 Amp 7855
–	Precision Breakers:
		2–35 Amp PS series
		2–40 Amp Small Frame P
		15–30 Amp 9115
		35–150 Amp Large Frame P

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Support

–		Amp Ratings
–		Configurations
–		Cross Reference
–		FAQ
–		Part Number Ordering Info (file type: PDF)
–		Performance Chart
–		Reset: Auto vs. Manual

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Contact / Distributor

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See Also

–		Klixon Catalog Request
–		Klixon Image Library
–		RoHS Compliance new
–		www.Klixon.com

Site Updated Oct. 10, 2008

Sensata > Products > Controls > Circuit Breakers > Thermal >

Klixon^® 7851 and 7854 Series

12.5 to 60 Amp Commercial, Sealed, Ignition Protected Thermal Breakers

•	Ignition protected
Similar in construction to the C Series device. Incorporation of the standard stud type terminals affords the design engineer additional design flexibility beyond the screw type terminals found in the C series breaker. Using a bimetal, snap–acting disc as the sensing and actuating element, this thermal circuit breaker provides trouble free over–current protection for harsh environments. This device is available in two configurations:
•	7851: Sealed construction, manual reset (pushbutton)
•	7854: Sealed construction, automatic reset
Applications
•	Accessory and equipment protection for stern–drive marine engines and other marine applications requiring ignition protected devices
•	Battery protection in electric vehicles
General Envelope Dimensions Nominal dimensions provided for reference only. Side View of 7851 (pushbutton omitted for 7854):

Bottom View of 7851 and 7854:

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

Solid Lines: 7851 and 7854 (above 10 Amps), C series, 6790 Series (above 20 Amps)
Dotted Lines: C series (10 Amps and below), 6790 series (20 Amps and below)

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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