CT40 Spring Operating Mechanism

The CT40 spring operated mechanism is a power drive component designed specifically for 10kV-40.5kV medium and high voltage switchgear (such as vacuum circuit breakers, SF6 load switches). With spring energy storage as the core power source, it has become a key equipment in medium voltage distribution systems, industrial substations, and outdoor distribution networks due to its stable mechanical performance, flexible operation mode, and wide adaptability. It provides precise and reliable power support for switch opening and closing operations, ensuring the safe and stable operation of the power system.
1、 Core working principle: Efficient logic driven by spring energy storage
The core of the CT40 spring operated mechanism is the mechanical transmission cycle of "energy storage release", which drives the switching device to complete the opening and closing actions through the elastic potential energy stored in the spring. The specific process is as follows:
1. Energy storage stage
Electric energy storage: By default, electric mode is preferred. The motor (AC220V/DC220V, power ≤ 150W) drives the reduction gear set to operate and drives the energy storage shaft to rotate. The energy storage shaft compresses the closing spring through the cam mechanism. When the spring is compressed to the rated stroke (corresponding to the energy storage completion position), the energy storage pawl engages and locks with the ratchet wheel. At the same time, the stroke switch triggers the motor to cut off power, and the energy storage process ends (time ≤ 15s), and the mechanism enters the waiting closing state.
Manual energy storage: As an emergency backup method, when the motor fails or there is no power supply, the energy storage shaft can be rotated by inserting a manual rocker arm, manually compressing the closing spring until the pawl is locked. The rocker arm needs to be rotated ≤ 40 turns (with a speed of 30r/min) throughout the entire process to ensure normal energy storage in emergency situations.
2. Execution of opening and closing actions
Closing operation: After receiving the closing signal, the closing electromagnetic iron is energized to push the release mechanism to release the energy storage pawl. The closing spring instantly releases elastic potential energy, which drives the moving contact of the switchgear to quickly close through the connecting rod transmission mechanism, completing the closing process; At the same time, the closing action will synchronously stretch the opening spring, storing energy in advance for subsequent opening operations.
Opening operation: Upon receiving the opening signal (or manually pulling the opening handle), the opening electromagnet (or mechanical release component) is activated, the opening lock is released, the opening spring releases energy, and the transmission mechanism is pulled to quickly disconnect the moving contact, cutting off the circuit (opening time ≤ 25ms, can quickly cut off the fault current, reduce the impact of accidents).

Key structural design: reliable characteristics adapted to medium voltage scenarios
1. High stability mechanical architecture
Modular component design: The energy storage component (spring, gear set), transmission component (connecting rod, cam), and control component (electromagnet, travel switch) are separated into independent modules, connected by precision shaft sleeves with a matching accuracy of 0.05mm, reducing mechanical friction loss and extending mechanical life (≥ 10000 opening and closing operations).
High strength material selection: The closing spring is made of 60Si2MnA alloy spring steel, which has undergone isothermal quenching and tempering heat treatment, with a tensile strength of ≥ 1800MPa and no permanent deformation after long-term energy storage; The transmission connecting rod and energy storage shaft are made of Q235B cold-rolled steel plate, with a galvanized surface (zinc layer thickness ≥ 8 μ m) and a salt spray corrosion resistance of 480 hours, suitable for humid and dusty distribution environments.
2. Convenient operation and status monitoring
Visual status indication: The mechanism housing is equipped with mechanical pointers for "energy storage status" (red - not stored/green - stored) and "opening/closing status" (blue - open/yellow - closed), which can intuitively determine the current status of the equipment without disassembly, facilitating on-site inspection and troubleshooting.
Compatible installation interface: The bottom is designed with standardized installation holes (hole spacing suitable for universal installation dimensions of 10kV-35kV circuit breakers), which do not require customized brackets and can be fixed with 4 M12 bolts, reducing installation time to less than 30 minutes; The electrical wiring adopts plug-in terminals, and the connection of the opening and closing electromagnet and travel switch does not require welding, which improves the efficiency of on-site debugging.