WSB9L Series DIN‑Rail MCB + ELCB Earth Leakage Circuit Breaker
Westhomes WSB9L Series DIN‑Rail Mounted Low‑Voltage Miniature Circuit Breaker with Integrated Earth Leakage (ELCB / RCCB) Protection.
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Westhomes WSB9L DIN‑Rail Earth Leakage MCB
Rated for AC 230/400 V, 6 to 100 A, with 30/50/100 mA residual current trip. High breaking capacity (6 kA / 10 kA), compliant with IEC 61009 & GB 16917, ideal for residential, commercial and industrial applications.
The WSB9L series provides combined overcurrent (MCB) and residual current (ELCB) protection for AC 50/60 Hz circuits with rated voltages of 230 V (single phase) and up to 400 V (multiple poles). Available in configurations up to 100 A, it is designed to prevent electric shock, overload, and short circuit, while also supporting infrequent manual line switching—ideal for residential, hotel, commercial, and industrial settings.
Key Features:
Rated Current (In): 6, 10, 16, 20, 25, 32, 40, 50, 63, 80, up to 100 A
Residual Operative Current (IΔn): 30 mA, 50 mA, or 100 mA
Poles & Width: 1P+N or 3P+N; available widths: 36 mm or 72 mm
Breaking Capacity: Standard 6 kA (N); High („H“) version up to 10 kA
Standards Compliance: IEC 61009, GB 16917.1 & GB 16917.22
Advantages
Precision earth leakage detection to reduce shock risks
Integrated overcurrent and short-circuit protection
Compact DIN‑rail design ensures easy panel integration
Customizable current and residual current ratings to fit diverse needs
Fully certified for international and Chinese safety standards
Applications
Suitable for installation on standard 35 mm DIN rails, the WSB9L series offers a modular, compact design with fast installation. Ideal for protecting circuits in homes, commercial buildings, hotels, light industry, and mining facilities.
KEY INFORMATION
| Rated voltage (V) |
Initial state | Rated residual action current I△n(mA) |
Rated residual non-action current I△no(mA) |
Max breaking time | Rated short circuit breaking capacity(A) | Type of instantaneous releaser | ||||||
| I△ n |
2I△ n |
5I△ n |
||||||||||
| AC230 | 6, 10, 16, 20, 25, 32, 40, 50, 63, 80, 100 | 30 | 15 | 0.2 | 0.1 | 0.04 | 6000 | C | ||||
| Current rating(A) | Test current | Initial state | Time limit | Expected result | Remarks | |||||||
| 6,10,16,20,25,32,40,50,63,80, 100 |
1.13In | Cold | t≤1h(6-63A) | Not tripping | ||||||||
| t≤2h(80A) | Tripping | |||||||||||
| 1.45In | Thermal | t<1h(6-63A) | Tripping | Current rises to the set value in 5s steadily | ||||||||
| t<2h(80A) | Tripping | |||||||||||
| 2.55In | Cold | 1s | Tripping | In≤32A | ||||||||
| 1s | In>32A | |||||||||||
| C | 5In 10ln |
Cold | t≤0.1s | Not tripping | Connect the current by closing the auxiliary switch | |||||||
| t<0.1s | Tripping | |||||||||||
Overall and Mounting Dimension(mm)
Basic Info.
| Model NO. | WSB9L-100 |
| Arc-extinguishing Medium | Air |
| Structure | MCB |
| Type | Circuit Breaker |
| Certification | ISO9001-2000, CE, CB, CCC |
| Voltage | AC400V |
| Width | 36, 72mm |
| Specification | GB 16917.1&GB 16917.22 |
| Origin | Prc |
| Production Capacity | 15, 000, 000 |
| Speed | Normal Type Circuit Breaker |
| Installation | DIN Rail |
| Poles Number | 1p+N, 3p+N |
| Function | Conventional Circuit Breaker, Circuit-Breaker Failure Protection, Overcurrent Protection, OVP(Overvoltage Protection) |
| AMPS | 6, 10,16, 20, 25, 32, 40, 50, 63, 100 |
| Transport Package | Paper Box |
| Origin | China |
| Production Capacity | 10000PCS/Week |
155 MBFREQUENTLY ASKED QUESTION (FAQ)
What is the difference between WSB9L and a standard MCB?
The Westhomes WSB9L combines overcurrent protection and residual current protection in one device. A standard MCB mainly protects against overloads and short circuits, while the WSB9L can additionally detect earth leakage and disconnect the circuit when the residual current reaches its specified operating level.
Is WSB9L an RCBO or an RCCB?
The WSB9L is designed as a combined protection device, integrating residual current protection with overcurrent protection. In applications where both functions are required in one DIN-rail device, it can be considered an RCBO-type solution. The exact product configuration should be confirmed according to the selected WSB9L model.
Can the WSB9L prevent electric shock?
The residual current protection function of the WSB9L can help reduce the risk associated with earth leakage and residual currents. A suitable residual operating current, such as 30mA where applicable, should be selected according to the installation design and local electrical requirements. It should not be regarded as a substitute for proper grounding and other electrical safety measures.
Why does an earth leakage MCB trip frequently?
Frequent tripping may be caused by insulation deterioration, damaged cables, moisture, faulty appliances, accumulated leakage current, or an incorrect protection setting. The electrical circuit should be inspected to identify the source of the residual current before the breaker is reset repeatedly.
How do I choose the right rated current for the WSB9L?
The rated current should be selected according to the calculated load current, cable ampacity, circuit characteristics, and applicable electrical standards. The breaker should provide adequate protection without being unnecessarily oversized. Westhomes offers different current ratings for its circuit protection products, allowing the device to be matched to different applications.
Can WSB9L be installed in a residential distribution board?
Yes. A DIN-rail earth leakage protection device such as the WSB9L can be used in residential distribution systems when its rated voltage, current, pole configuration, residual current rating, and breaking capacity are suitable for the installation. DIN-rail mounting also makes it convenient for use in compact distribution boards.
What should I check before installing a WSB9L?
Before installation, check the system voltage, rated current, number of poles, residual operating current, short-circuit breaking capacity, wiring configuration, and compatibility with the distribution board. The selected model should match the electrical characteristics of the circuit and be installed by qualified personnel.
What causes an earth leakage MCB to trip even when the load is normal?
A normal load current does not necessarily mean that there is no leakage current. Insulation faults, moisture, damaged equipment, wiring problems, or the combined leakage current of several connected devices can cause the WSB9L to trip even when the total load current remains within its rated value.
What is the advantage of a DIN-rail mounted earth leakage MCB?
A DIN-rail mounted earth leakage MCB provides a compact way to integrate circuit protection into a distribution board. By combining overcurrent and residual current protection, it can reduce the number of separate protective devices required and simplify panel layout and installation.
How does the WSB9L respond to an earth leakage fault?
When the residual current in the protected circuit reaches the device's specified operating threshold, the WSB9L is designed to disconnect the circuit. This helps isolate the faulty circuit and reduce the potential risks associated with persistent earth leakage.
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