5A Overcurrent Solenoid

Dongfa Intelligent manufactures the 5A Overcurrent Solenoid for integration into circuit breaker trip assemblies where a defined current condition needs to produce mechanical push rod movement. The assembly combines a hard magnetic enameled wire coil with a galvanized metal housing, chrome-plated metal push rod, U-shaped mounting bracket, and adjustable end, allowing the component to be fitted to different mechanical tripping arrangements.

Core Advantages

5A Defined Operating Point

The model is built around a 5A driving current, providing a clear reference for circuit breaker overcurrent tripping applications.

2.3Ω Coil Resistance

The 2.3Ω resistance at 20°C provides an electrical reference for circuit design and component matching.

Adjustable Operating Point

The metal adjustment end changes spring preload, allowing the operating point to be fine-tuned for the actual circuit breaker trip mechanism.

Short-Time Tripping Action

The solenoid is intended to convert a specified current condition into mechanical push rod movement during a trip event.

Spring Self-Reset

The built-in spring returns the push rod after actuation according to the mechanical arrangement of the connected circuit breaker.

How It Works

The 5A Overcurrent Solenoid operates according to current rather than a conventional fixed control voltage. When the coil current reaches the required operating point, electromagnetic force moves the push rod and transfers the action to the circuit breaker tripping mechanism.

At 5A and 2.3Ω, the calculated voltage drop across the coil is approximately 11.5V, based on Ohm's law. The corresponding calculated electrical power is approximately 57.5W during energization. Actual circuit voltage and operating conditions depend on the complete protection circuit.

Adjustable Operating Point

The adjustment end is installed at the push rod side of the solenoid. Rotating this structure changes the spring preload and therefore the force required for actuation. This allows the operating point to be adjusted when the standard setting needs to be matched to a specific circuit breaker mechanism.

Calibration Around 5A

For the standard model, calibration can be performed with 5A as the reference current. The adjustment end is positioned, the test current is applied, and push rod movement is checked. The setting is then fine-tuned and secured after the required operating point is reached. Final verification should be completed with the complete circuit breaker assembly because the mechanical linkage, spring force, and travel also affect the actual tripping condition.

Overcurrent Solenoid vs. Latching Solenoid

These two solenoid types have different electrical operating principles and mechanical functions. They should be selected according to the role of the component in the circuit breaker or switchgear system.

Technical Specifications

Applications

The 5A Overcurrent Solenoid is used in circuit breaker and switchgear mechanisms that require a current-sensitive mechanical trip function. Typical applications include circuit breaker overcurrent trip assemblies, switchgear protection mechanisms, power distribution equipment, and related power system protection devices.

Selection and Mechanical Matching

Selection should cover both the electrical characteristics of the coil and its mechanical interface with the circuit breaker. The main points to confirm are:

• Required operating current and coil resistance
• Push rod stroke, end configuration, and mounting dimensions
• Available installation space and required tripping force

New Circuit Breaker Designs

For a new design, the required operating current should be established first, followed by the coil and mechanical requirements. The standard model uses a 5A driving current and 2.3Ω reference resistance at 20°C.

Replacement Projects

For replacement work, the original solenoid model, dimensional drawing, or component photos can be used for initial identification. The existing mounting arrangement and push rod movement should then be checked before confirming compatibility.

Current Calibration and Production Control

Operating current is a key characteristic of an overcurrent trip actuator. During production, Dongfa Intelligent checks the electrical characteristics of the coil and verifies the operating current of the assembled component. The adjustment end is initially set during assembly so that the unit can be further matched with the complete circuit breaker mechanism when required.

Before shipment, the 5A Overcurrent Solenoid undergoes operating current testing and dielectric withstand testing. For customized versions, required current characteristics and mechanical dimensions can be reviewed before production.

Supply Information

FAQ

Does this overcurrent solenoid have a fixed operating voltage?

No fixed operating voltage is specified as the primary selection parameter. The model is defined by a 5A driving current and 2.3Ω coil resistance at 20°C, while the actual voltage depends on the circuit design.

Why is the coil resistance specified at 20°C?

Coil resistance changes with temperature, so 20°C is used as the reference condition for the stated 2.3Ω value.

Can the operating current be adjusted?

Yes. The adjustable end changes spring preload and allows the operating point to be fine-tuned for the actual circuit breaker tripping mechanism.

Is this product intended for continuous energization?

No. The 5A Overcurrent Solenoid is intended for short-time actuation during the required trip action. The duty condition should match the circuit breaker mechanism.

Can it directly replace a latching solenoid?

No. The two products have different operating principles and functions. Compatibility must be checked based on the electrical circuit and mechanical role of the original component.

What information is needed for a quotation?

Please provide the required driving current, coil resistance, mounting dimensions, push rod stroke, and quantity. For replacement projects, the original model, drawing, or component photos are recommended.