Dongfa Intelligent, a manufacturer of 5A Lead Wire Overcurrent Solenoid for Circuit Breaker, supplies current-driven solenoids for circuit breaker overcurrent tripping mechanisms and switchgear protection assemblies. This model is rated at 5A driving current with 1.8Ω coil resistance at 20°C and features a green flame-retardant coil bobbin, brass push rod, external reset spring, black dual lead wires, and six threaded mounting holes on the top face. Its low-resistance configuration is designed for applications requiring a lower voltage drop at the specified operating current.
The solenoid uses a 1.8Ω coil resistance with a rated driving current of 5A and ±5% resistance accuracy at a 20°C reference temperature. At 5A, the calculated voltage drop is approximately 9V and the calculated power loss is approximately 45W.
Compared with 2.3Ω and 2.5Ω configurations operating at the same 5A current, the 1.8Ω version has a lower voltage drop and lower calculated power loss. This configuration can be considered where the available driving voltage or coil power loss needs to be taken into account during circuit breaker mechanism design.
Six threaded mounting holes are arranged on the top face of the solenoid. The multiple fixing points allow the mounting position to be selected according to the available space and mechanical layout of the circuit breaker mechanism.
The solenoid is equipped with two black multi-strand copper lead wires for connection to the control circuit. The lead-wire configuration can be integrated into wiring arrangements where a direct wire connection is preferred instead of a plug-in terminal.
The brass push rod provides the mechanical output required by the circuit breaker tripping mechanism. A stainless steel external reset spring is installed at the rear of the solenoid for spring self-reset after actuation. Its external position also allows the spring condition to be checked during maintenance.
The coil uses a green flame-retardant plastic bobbin, while the solenoid is assembled with a U-shaped galvanized metal housing. The supplied construction also includes hard magnetic enameled wire winding and a brass push rod.
The main electrical specification is a 5A rated driving current combined with a 1.8Ω coil resistance. Resistance affects the voltage required across the coil and the power converted into heat during operation.
| Coil Resistance | Approx. Voltage Drop at 5A | Approx. Power Loss at 5A |
| 1.8Ω | 9V | 45W |
| 2.3Ω | 11.5V | 57.5W |
| 2.5Ω | 12.5V | 62.5W |
The 1.8Ω configuration should be selected according to the circuit breaker's actual control circuit, available voltage, thermal conditions, and tripping mechanism design. The lower resistance does not mean that the solenoid is designed to operate at a higher rated current; the specified driving current remains 5A.
| Parameter | Specification |
| Product Name5A Lead Wire Overcurrent Solenoid for Circuit Breaker | |
| Rated Driving Current | 5A |
| Coil Resistance | 1.8Ω |
| Resistance Accuracy | ±5% at 20°C reference |
| Wiring Method | Lead wire type |
| Lead Wires | 2 pcs, black multi-strand copper wire |
| Push Rod Material | Brass |
| Reset Method | Spring self-reset with rear external reset spring |
| Mounting | Fixed mounting with six threaded mounting holes on top face |
| Housing | U-shaped galvanized metal housing |
| Coil Bobbin | Green flame-retardant plastic |
| Winding | Hard magnetic enameled wire winding |
| Reset Spring Material | Stainless steel |
| Duty Cycle | Short-time duty |
| Standard | GB |
| Certification | ISO 9001 Quality Management System |
| Packaging | Carton packaging |
In a circuit breaker overcurrent protection assembly, the 5A Lead Wire Overcurrent Solenoid for Circuit Breaker is installed inside the tripping mechanism and connected to the relevant current-driven control circuit. When the specified operating current reaches the solenoid, the electromagnetic actuator provides mechanical movement through the brass push rod, which can be integrated with the circuit breaker's tripping mechanism to initiate the required mechanical action.
In a switchgear assembly with limited internal installation space, the six threaded holes on the top face allow the manufacturer to select suitable fixing points according to the mechanism layout. The two black lead wires can be connected to the existing control wiring, while the external rear spring provides spring self-reset after actuation.
The solenoid can be used as a current-driven actuation component in power system protection assemblies where an overcurrent tripping mechanism requires a 5A operating current and 1.8Ω coil resistance. The actual electrical and mechanical requirements should be confirmed according to the complete protection assembly.
For circuit breaker manufacturing or replacement projects, the component can be considered when the required operating current, coil resistance, mounting dimensions, push rod stroke, wiring method, and reset arrangement match the existing mechanism.
The product is designed for short-time duty rather than continuous operation. The complete application should follow the electrical and mechanical requirements of the circuit breaker or switchgear assembly.
Different resistance configurations are supplied for different electrical and assembly requirements. Selection should consider the circuit breaker tripping mechanism, control power voltage, wiring method, and installation requirements.
| Version | Main Configuration | Selection Consideration |
| 1.8Ω | Lead wire type, six top threaded mounting holes | Lower voltage drop and lower calculated power loss at 5A |
| 2.3Ω | Adjustable end | Suitable for circuit breakers requiring fine adjustment of trip current |
| 2.5Ω | Plug-in terminal | Suitable where fast assembly and convenient maintenance are required |
The appropriate version should be matched with the actual circuit breaker design rather than selected according to resistance alone.
Dongfa Intelligent provides technical support for product selection, replacement compatibility, and application-related questions after ordering. Customers can contact the team for assistance with the supplied solenoid.
Support is available for product selection, mounting dimensions, push rod stroke, wiring method, coil resistance, and other technical requirements. For replacement projects, customers can provide the original solenoid model and available drawings or dimensions for compatibility checking.
Dongfa Intelligent provides after-sales response within 24 hours. For replacement projects, the supplied product information can be reviewed to help confirm whether the electrical and mechanical requirements match the existing mechanism.
Customers requiring supplier assessment can arrange factory audits. Relevant quality management system information and product technical documents can be provided according to the project requirements.
The main differences are resistance, wiring or mechanical configuration, and the corresponding electrical characteristics. The 1.8Ω version has a lower voltage drop at 5A, the 2.3Ω version is supplied with an adjustable end, and the 2.5Ω version uses a plug-in terminal. The appropriate model should be selected according to the circuit breaker tripping mechanism, control voltage, and assembly requirements.
No. The rated driving current of the 5A Lead Wire Overcurrent Solenoid for Circuit Breaker is 5A. At this current, the 1.8Ω coil has an approximately 9V voltage drop and approximately 45W calculated power loss. Resistance affects the voltage and power characteristics at the specified current; it does not by itself define a higher operating current.
The six threaded holes on the top face provide multiple fixing points for installing the solenoid within the circuit breaker mechanism. The appropriate holes can be selected according to the available installation space and mechanical layout.
The six top mounting holes provide flexibility for different mounting orientations. Horizontal, vertical, or inclined installation can be considered when permitted by the actual circuit breaker mechanism and mounting structure.
The lead-wire version uses two black multi-strand copper wires to connect with the control circuit, while the plug-in terminal version uses a plug-in connection. Lead-wire type can suit existing wiring processes, while plug-in terminals provide a different assembly and maintenance method.
The push rod is made of brass. The rear external reset spring is made of stainless steel. The external spring provides spring self-reset and allows its condition to be checked without opening the main solenoid body.
Address
No. 281, Wei 18th Road, Yueqing Economic Development Zone, Yueqing, Wenzhou, Zhejiang, China
Tel
