S1360-10L – Textron Aviation 10 Amp Push-Pull Circuit Breaker
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The S1360-10L is a genuine Textron Aviation (Cessna/Beechcraft) OEM, flight-critical thermal circuit breaker. This component is a cornerstone of aircraft electrical system safety, providing precise and reliable overcurrent protection for a 10-ampere circuit. It is engineered to automatically interrupt the flow of current in the event of an overload or short circuit, thereby protecting wiring from overheating and preventing potential electrical fires.1
This circuit breaker features a robust "push-pull" actuation mechanism, allowing it to be manually opened (pulled OFF) or closed (pushed ON/RESET). Crucially, it incorporates a trip-free design, ensuring that the internal contacts cannot be held closed against a fault condition. When an overcurrent event occurs, the breaker trips automatically, causing the button to extend and typically reveal a white band, providing a clear visual indication of the circuit's status. As a genuine Textron part, it guarantees the performance and reliability required for certified aircraft.
Key Features
Genuine Textron Aviation OEM Part: Ensures the correct electrical characteristics, trip curve, and physical specifications for the aircraft application.
Push-Pull (Manual ON/OFF, Auto Trip) Actuation: Provides both manual control and automatic thermal protection.
10 Amp Current Rating: Precisely calibrated to protect circuits with a nominal current draw at or below 10 amperes.
Thermal Trip Mechanism: Utilizes a proven, temperature-sensitive bimetallic element for reliable overcurrent detection and interruption.
Trip-Free Design: A critical safety feature that prevents the breaker contacts from being manually held closed during an active overload or short circuit.
Visual Trip Indication: The push-button extends, often revealing a white collar, providing an immediate visual cue that the breaker has tripped.
High-Reliability Construction: Built to withstand the vibration, temperature extremes, and demanding operational environment of an aircraft cockpit.
Technical Specifications
Part Number: S1360-10L
Component Type: Thermal Circuit Breaker, Push-Pull
OEM Manufacturer: Textron Aviation (sourced from specialized manufacturer like Klixon/Sensata or ETA).
Current Rating: 10 Amperes
Voltage Rating: Typically rated for up to 250 VAC / 50 VDC (Must be verified by specific component marking or datasheet).
Actuation Mechanism: Bimetallic Thermal Element
Reset Type: Push-to-Reset (after cooling)
Mounting Style: Panel Mount, Threaded Bushing (e.g., 3/8-32 thread).
Terminal Type: Likely Screw Terminals ('L' designation often indicates screw terminals, but must be verified).
Governing Specifications: Manufactured to meet or exceed relevant military specifications (e.g., MS26574 type) and FAA requirements.
Aircraft Compatibility
The S1360-10L is a standard circuit breaker used across a wide range of Textron Aviation aircraft, including many Cessna and Beechcraft models. It is not specific to one airframe but is selected based on the electrical load requirements of the protected circuit.
Crucial Note: The correct amperage rating and part number for a specific circuit must be verified against the aircraft's current Wiring Diagram Manual and Illustrated Parts Catalog (IPC).
Applications
The S1360-10L is used for the primary circuit protection of numerous moderate-load aircraft systems, including but not limited to:
Avionics Bus Feeds
Navigation and Communication Radios
Interior Lighting Circuits
Fuel Pump Circuits
Autopilot Components
Electric Trim Motors
Why Choose S1360-10L?
Choosing the genuine Textron S1360-10L is a critical decision for electrical system safety. The circuit breaker is the primary defense against electrical fires.2 A failure can manifest in two dangerous ways: failing to trip during an overload (leading to fire) or nuisance tripping (causing loss of an essential system). Using a non-certified or incorrect amperage breaker introduces unacceptable risks.3 The genuine OEM part guarantees that the breaker has the precise thermal trip characteristics, endurance ratings, and quality control required for a safe and airworthy electrical system.
The operation of the S1360-10L is governed by the thermo-mechanical properties of its bimetallic strip. This strip, which acts as both the primary conductor and the actuator, is a composite element formed by bonding two dissimilar metals with significantly different coefficients of thermal expansion.4 Current from the circuit flows directly through this strip. Under normal operating loads, the resistive heat generated ($P=I^2R$) is minimal and is safely dissipated. During an overcurrent condition, however, the heat generated increases exponentially. This causes the two metals in the strip to expand, but the metal with the higher coefficient of thermal expansion expands more, forcing the strip to bend.5 This breaker exhibits an inverse time-current (I-T) characteristic: a minor overload (e.g., 125%) generates heat slowly and may take minutes to cause the strip to bend enough to release its mechanical latch, allowing for temporary, harmless inrush currents. A major short circuit (e.g., 1000%), by contrast, generates intense heat almost instantly, causing the strip to snap open in milliseconds. This I-T curve is carefully engineered to be just below the thermal damage curve of the copper wire it is designed to protect, ensuring that the breaker will always open the circuit before the wire's insulation can melt.
Note: This is a flight-critical electrical system safety component. A circuit breaker is a protective device, not a switch for routine use.6 If a breaker trips in flight, it indicates a fault in the circuit. After allowing a brief cooling period (1-2 minutes), a single reset may be attempted. If the breaker trips again, a persistent fault exists, and it MUST NOT be reset again. All electrical system work must be performed by a certified A&P or avionics technician.
Documentation
Definitive applicability must be confirmed via the aircraft's official Wiring Diagram Manual and Illustrated Parts Catalog (IPC). Specific technical data may be available from the component manufacturer (e.g., Klixon/Sensata or ETA).