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Ideal for industrial, commercial, and building applications, the YCB9NZF-40 IoT miniature circuit breaker delivers smart, reliable power protection. Monitor 10+ electrical parameters (voltage, current, temperature, leakage, etc.) in real time, with 13 customizable protection functions (over-voltage, under-voltage, overload, high-temperature, etc.) that trigger alarms or trips. Built to IEC standards, it boasts 6kA short-circuit breaking capacity and 15,000+ mechanical operations for long-term durability. Connect via RS485/Wi-Fi, manage up to 16 devices through a gateway, and customize ratings (20A/40A) to fit your load needs. Streamline operations, reduce downtime, and enhance safety—your smart distribution partner.
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YCB9NZF-40 series IoT miniature circuit breakers are used in low-voltage terminal distribution networks in industrial, commercial, civil buildings and infrastructure in indoor buildings and similar places. IoT miniature circuit breakers are used in conjunction with intelligent gateways to monitor key electrical parameters of power lines, such as voltage, current, power, temperature, leakage, energy consumption, etc.In real time, and have functions such as remote control, abnormal warning, accident tripping alarm, power metering statistics, and fault location.
| YC | B | 9N | ZF | 40 |
| Company code | Category Code | Design Serial Number | Smart Circuit Breaker | Frame Rating |
| YC | B | 9N | ZF | 40 |
| AP | 1P+N | 20A | RS485 | AC |
| Auxiliary Code | Number of poles | Rated Current | Communication Method | Residual Current Protection Type |
| AP: Automatic Reclosing; BZ: Semi - automatic; APE: With PE Line |
1P+N | Preferred: 20, 40; (Other specifications can be customized) |
1.RS485 2.Wif |
AC Type,AType,B Type |
| Serial Number | Protection Function | Tripping Type | Factory Default Value |
Parameter Setting | Setting Value | Factory Default Value for Setting |
| 1 | Over-voltage Protection | OffIAlarm/Trip | Trip | Over-voltage Setting | 250-350V | 280V |
| Over-voltage Delay | 0-10s | 3s | ||||
| 2 | Under-voltage Protection | OffIAlarm/Trip | Alarm | Under-voltage Setting | 110-200V | 165V |
| Under-voltage Delay | 0-10s | 3s | ||||
| 3 | Overload Protection | OffIAlarm/Trip | Trip | Overload Setting | 0.6ln-In | In |
| Phase-failure Delay | 0-10s | 3s | ||||
| 4 | High-temperature Protection |
OffIAlarm/Trip | Alarm | High -temperature Setting |
60-100℃ | 80℃ |
| High -temperature Delay | 0-10s | 5s | ||||
| 5 | Pre -warning Function | Off/On | On | Pre-warning Proportion | 90-100% | 95% |
| 6 | Alarm Enable | Off/On | On | --- | --- | --- |
| 7 | Over-power Protection | OffIAlarm/Trip | Off | Over-power Value | 5-50KW | 2KW |
| Over-power Delay | 0-10s | 5s | ||||
| 8 | Under-power Protection | OffIAlarm/Trip | Off | Under-power Value | 5-50KW | 2KW |
| Under-power Delay | 0-10s | 5s | ||||
| 9 | Timing Control | Set/Off | Off | --- | --- | --- |
| 10 | Automatic Closing | Off/On | Off | --- | --- | --- |
| 11 | Leakage Protection | OffIAlarm/Trip | Trip | Leakage Setting Value | 30-100mA (AC type),30mA(A type/B type) |
30mA |
| Non -actuation Time | ~0.06s(AC type), 0-0.2s(A type/B type) |
--- | ||||
| 12 | Leakage Self-check | Yes(A type/B type) |
-------- | |||
| 13 | Manual-Automatic Integrated Control | Yes | -------- | |||
• “/” means no function, “---” means no parameter
• Trip type notes:
Off: turn off this function, when the protection action value is reached, the product will not protect;
Alarm: when the protection action value is reached, the product will only alarm but not trip;
Trip: when the protection action value is reached, the product will trip.
| ltem | Product Model |
| Standards Complied with | IEC/EN3024,IEC/EN61009-1 |
| Number of Poles | 1P+N |
| Rated Voltage | Single -phase AC230V,50Hz |
| Rated Current | 20A,40A(Other specifications can be customized) |
| Tripping Type | C type (Other types can be customized) |
| Short-Circuit Breaking Capacity | Icu=Ics =6kA |
| Mechanical Life | >15000 operations |
| Electrical Life | >6000 operations |
| Closing Time | <1.5s |
| Opening Time | <1.0s |
| Metering Accuracy | 1.0 |
| Leakage Trip Value | (30-100mA)AC type,30mA(A type),30mA(B type) |
1. Enter the gateway network configuration mode (host mode), the sub- device indicator light flashes blue, and enters the network configuration state;
2. Press the sub-device network configuration button to configure the network. The sub-device indicator light flashes red when the current sub-device is successfully paired;
3. Pair sub-devices one by one;
4. After all sub-devices are paired, press the gateway “Menu” button to confirm, exit the network configuration mode, and the network configuration is completed
5. Scan the code using APP to add a device
Wi-Fi product interface and network configuration instructions
Interface and network configuration instructions for PE products
Installation dimensions
1. The device is suitable for standard 35mm rail installation. When installing, just snap the device into the rail and fix it with the buckle
2. According to the actual power distribution management and line laying design requirements,select and use the IoT modules and electrical box specifications that meet the needs, and install them in the order of the modules shown in the figure. Each module is connected with a 2PIN data cable specially made by the manufacturer.
3. The circuit breaker should be installed vertically. When the handle is in "/OFF", the contacts are in the disconnected state. When the handle
moves upward, the contacts move in the closing direction;
4. The nominal cross-sectional area of the copper wire used for connection that matches the rated current of the circuit breaker is shown in the table below.
| Rated current(A) |
10 | 16~20 | 25 | 32 | 40~50 | 63 | 80 |
| Conductor cross-sectionalarea(mm²) |
1.5 | 2.5 | 4 | 6 | 10 | 16 | 25 |
| Moment(N.m) | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 |
During the transportation of products, they should be protected from the invasion and mixing of water, rain, snow or other harmful liquids such as chemical solvents and corrosive liquids; strong collision and extrusion between objects should be prevented;
they should be stacked according to the direction indicated on the packaging, and the number of stacking layers can be seen from the outer box of the packaging.
● Storage environment conditions: ambient temperature -10°C~+45°C;
● Relative humidity ≤90% (when ambient temperature is +20°C);
● The storage location should be dust-free and conductive dust-free;
● No corrosive, flammable and explosive gases, no rain or snow invasion;
● Dry and well ventilated;
● Stack in the direction indicated on the package,and do not stack higher than the number marked on the outer packaging box.
1. This product has RS485 as a standard communication port, which can be connected to computers and other communication devices through.
2. RS485 to USB converter to achieve information exchange and control.
3. The default baud rate of the device is 9600bps, and the required baud rate can be viewed and set through the PC.
4. Product installation and commissioning must be carried out by professional electricians.
5. This product can be customized according to user needs, please contact relevant technicians for details.