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0102030405
China CBRB7L RCBO - Residual Current Circuit Breaker with Overcurrent Protection from Trusted Suppliers & Factory
Main purpose & scope of applications
The CBRB7L Residual Current Circuit Breaker (hereinafter “the RCCB”) is engineered for use in AC 50 Hz distribution circuits. It has a rated operational voltage of 230 V for single-pole two-wire and two-pole configurations, and 400V for three-pole and three-pole four-wire configurations. It supports rated currents up to 63 A and its service short-circuit breaking capacity does not exceed 6000 A. When leakage current exceeds the specified threshold or a person is exposed to electric shock, the RCCB rapidly disconnects the faulty supply to protect both personnel and electrical equipment.
The RCCB provides overload, short-circuit, residual-current (leakage), and overvoltage protection functions (the latter only on single-pole two-wire and two-pole models). It can be used to protect circuits or motors against overload and short-circuit faults, and under normal conditions may serve for infrequent circuit switching.
Note: This product complies with the following standards: GB/T16917.1, GB/T16917.22.
Product model and meaning
Product functions & classification
Classified by number of poles:
- a. Single-pole two-wire residual current circuit breaker (1P+N)
- b. Two-pole two-wire residual current circuit breaker (2P)
- c. Three-pole residual current circuit breaker (3P)
- d. Three-pole residual current circuit breaker (3P+N)
- e. Four-pole four-wire residual current circuit breaker (4P)
- 1. The RCCB provides overload, short-circuit, residual-current (leakage), and overvoltage protection (available on 1P+N and 2P configurations).
- 2. Its residual-current tripping characteristic is Type AC.
- 3. The RCCB is manually operated.
- 4. It is classified by rated current as 6 A, 10 A, 16 A, 20 A, 25 A, 32 A, 40 A, 50 A, 63 A, and 80 A.
- 5. Rated operational voltages are 230 V for 1P+N and 2P models, and 400 V for 3P, 3P+N, and 4P models.
- 6. The main-circuit making/breaking functions comply with GB/T 10963.1, and the trip unit has a Type C characteristic.
- 7. Basic specifications and residual-current tripping parameters are listed in Table 1.
| Rated Current | Number of poles | Rated residual operating current | Rated residual non-operating current |
|---|---|---|---|
| 6A~63A | 1P+N, 2P, 3P, 3P+N, 4P | 30mA, 50mA | 15mA |
(Table 1)
Operating & Installation conditions
- 1. Ambient Air Temperature: Upper limit not to exceed +40°C; Lower limit not to fall below -5°C.
- 2. Altitude: Installation site altitude shall not exceed 2000m above sea level.
- 3. Atmospheric Conditions: At maximum +40°C, relative humidity must not exceed 50%. In the wettest month with a mean minimum temperature not above +25°C, relative humidity must not exceed 90%. Condensation due to temperature changes must be considered.
- 4. Pollution Degree: The installation location shall be classified as Pollution Degree 2.
- 5. Magnetic Field: External magnetic fields at the installation site must not exceed 5 times the Earth's magnetic field in any direction.
- 6. Installation Category: Residual-current devices shall be rated for category II or III.
- 7. Mounting Rail: Devices shall be mounted on a TH35-7.5 steel DIN rail.
- 8. Installation Orientation: Installed vertically, with the handle in the "up" position corresponding to "ON."
- 9. Vibration: Installation sites must be free from significant shock and vibration.
- 10. Wiring Method: Secure the conductors by clamping them under screws.
Basic parameters
1. Rated Short-Circuit Making and Breaking Capacity:
CBRB7L-63i: Ics=Icn=3000A；CBRB7L-63s: Ics=Icn=4500A
2. Residual Short-Circuit Making and Breaking Capacity: Im=2000A
3. Overcurrent Tripping Characteristics: Under normal installation conditions and at a reference ambient temperature of 30°C to 35°C, the overcurrent tripping characteristics of the RCCB shall comply with the requirements specified in Table 2.
| Rated Current In(A) | Initial State | Test Current(A) | Specified Time(t) | Expected Result |
|---|---|---|---|---|
| ≤63 | Cold State | 1.13In | t≥1h | Not Tripping |
| ≤63 | Hot State | 1.45In | t<1h | Tripping |
| ≤32 | Cold State | 2.55In | 1s<t<60s | Tripping |
| >32 | Cold State | 2.55In | 1s<t<120s | Tripping |
| ≤80 | Cold State | 5In | t≥0.1s | Not Tripping |
| ≤80 | Cold State | 10In | t<0.1s | Tripping |
(Table 2) Overcurrent Tripping Characteristics
4. Over-current limits that must not cause an unintended trip when there is no leakage current in the main circuit:
- a. Unbalanced load over-current in the main circuit (including the neutral conductor passing through the sensing element): the maximum current that does not cause the RCCB to trip is 6 In.
- b. Balanced load over-current across both poles of the main circuit (including the neutral conductor passing through the sensing element): the maximum current that does not cause the RCCB to trip is 6 In.
Overall dimensions
Overall dimensions see Table 1 & 3
| Number of poles | 1P+N | 2P | 3P | 3P+N | 4P |
|---|---|---|---|---|---|
| L mm | 54 | 72 | 103 | 117 | 135 |
(Table 3)
Installation & adjustment
- 1. Pre-installation Check: Inspect the RCCB to ensure it is undamaged and its operating mechanism moves freely. Verify that the device’s nameplate ratings and markings match the operating conditions.
- 2. Wiring & Power Connection: Observe terminal markings; ensure incoming neutral "N" is reliably grounded. Power must be connected as follows: For 1P+N and 2P, connect to 230V. For 3P, 3P+N, or 4P, mount and wire Phase A (left-most pole) and Phase C to 400V. Otherwise, leakage-protection will not operate.
- 3. Protective Panel: If used outside of a distribution enclosure, install a grounded metal or insulated protective panel behind the device to prevent accidental contact.
- 4. Factory Settings: The trip-setting current is fixed at the factory and must not be adjusted. The device is non-serviceable and must not be opened or repaired.
-
5. Mounting and Dismounting Procedure (see Fig 2):
a. Installation: Align the mounting slot of the RCCB with the lower end of the rail (slightly tilted to the right, dashed line in Fig 2). Push upward (arrow 1), press the recess (arrow 2) onto the upper end of the rail. Release to complete.b. Dismounting: Perform the reverse: push upward (arrow 1), and rotate in the opposite direction of arrow 2 to remove.
Operation & Maintenance
- 1. Protection settings (leakage, overload, short-circuit, overvoltage) are preset by the manufacturer and must not be adjusted. The leakage trip device is not suitable for on-site assembly with the circuit breaker.
- 2. Test the RCCB monthly by pressing the test button while the breaker is in the closed (ON) position to ensure reliable leakage protection performance.
- 3. When the RCCB trips due to leakage, the leakage indicator button will be activated.
- 4. If the breaker trips due to a fault (leakage, overload, or short circuit), identify and eliminate the fault first. Press the leakage indicator button before closing the breaker.
- 5. If the breaker is damaged and cannot operate normally, it must be replaced with a new circuit breaker.
Ordering information
When placing an order, please specify the following details:
Product Model, Number of Poles, Rated residual operating current, Instantaneous Trip Type, Rated Current, Ordering Quantity.
Example: Order 100 units of CBRB7L-63 and CBRB7L-63s/1P+N, 30mA, C40.
Wiring Diagram
Frequently Asked Questions (FAQ)
What is the main purpose of the CBRB7L RCCB?
The CBRB7L RCCB is engineered for AC 50 Hz distribution circuits. When leakage current exceeds the specified threshold or a person is exposed to electric shock, the RCCB rapidly disconnects the faulty supply to protect both personnel and electrical equipment.
What protection functions does the CBRB7L RCCB provide?
It provides overload, short-circuit, residual-current (leakage), and overvoltage protection. Note that the overvoltage protection function is only available on single-pole two-wire (1P+N) and two-pole (2P) configurations.
What are the temperature and environmental requirements for installation?
The ambient air temperature must be between -5°C and +40°C. The altitude of the installation site must not exceed 2000m. At +40°C, the relative humidity must not exceed 50%, and must not exceed 90% at +25°C in the wettest month.
Why is the wiring connection method critical for 3P, 3P+N, or 4P models?
For 3P, 3P+N, or 4P devices, you must mount and wire Phase A (the left-most pole) and Phase C to a 400V supply. If this is not done, the leakage-protection function will not operate. For 1P+N and 2P devices, connect to a 230V supply.
How often should I test the leakage protection performance of the RCCB?
After a new installation or during standard operation, you should test the RCCB generally once a month. This is done by pressing the test button while the breaker is in the closed (ON) position to verify reliable performance.
Can the trip-setting current of the RCCB be adjusted manually?
No. The trip-setting current is fixed at the factory and must not be adjusted. The device is non-serviceable and must not be opened or repaired. If the breaker is damaged, it must be replaced with a new unit.