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China RCBO Suppliers - CBRB7L Residual Current Circuit Breaker with Overcurrent Protection from Factory for Safe Power Control
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.
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)
- 1The RCCB provides overload, short-circuit, residual-current (leakage), and overvoltage protection (available on 1P+N and 2P configurations).
- 2Its residual-current tripping characteristic is Type AC.
- 3The RCCB is manually operated.
- 4It 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.
- 5Rated operational voltages are 230 V for 1P+N and 2P models, and 400 V for 3P, 3P+N, and 4P models.
- 6The main-circuit making/breaking functions comply with GB/T 10963.1, and the trip unit has a Type C characteristic.
- 7Basic 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 |
Operating & Installation conditions
-
1Ambient Air Temperature:
a. Upper limit: not to exceed +40 °C
b. Lower limit: not to fall below –5 °C - 2Altitude: Installation site altitude shall not exceed 2000m above sea level.
-
3Atmospheric Conditions:
At the maximum ambient temperature of +40 °C, relative humidity must not exceed 50%. In the month with the highest humidity and a mean minimum temperature not above +25 °C, relative humidity must not exceed 90%. Condensation on the equipment surface due to temperature changes must be taken into account. - 4The installation location shall be classified as Pollution Degree 2 for residual-current devices.
- 5At the installation site, in any direction, external magnetic fields must not exceed five times the Earth’s magnetic field.
- 6Residual-current devices shall be rated for installation category II or III.
- 7Devices shall be mounted on a TH35-7.5 steel DIN rail.
- 8Residual-current devices should normally be installed vertically, with the handle in the “up” position corresponding to “ON.”
- 9Installation sites must be free from significant shock and vibration.
- 10Wiring method: Secure the conductors by clamping them under screws.
Basic parameters
-
1Rated Short-Circuit Making and Breaking Capacity:
CBRB7L-63i: Ics=Icn=3000A；CBRB7L-63s: Ics=Icn=4500A - 2Residual Short-Circuit Making and Breaking Capacity: Im=2000A
-
3Overcurrent 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 |
-
4Over-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 |
Installation & adjustment
-
1Check the following issues before installing the RCCB:
a. Inspect the RCCB to ensure it is undamaged and its operating mechanism moves freely.
b. Verify that the device’s nameplate ratings and markings match the intended operating conditions. -
2During installation of the RCCB, observe the terminal markings and ensure that the incoming neutral conductor “N” is reliably grounded to avoid miswiring.
Special note: Power must be connected as follows: For 1P+N and 2P devices, connect to a 230V supply. For 3P, 3P+N or 4P devices, mount and wire Phase A (the left-most pole) and Phase C to a 400V supply. Otherwise the leakage-protection function will not operate. - 3If the RCCB is used outside of a distribution enclosure, install a grounded metal (or insulated) protective panel behind the device to prevent accidental contact and electric shock.
- 4The trip-setting current is fixed at the factory and must not be adjusted, and the device is non-serviceable; it must not be opened or repaired.
- 5Mounting and dismounting procedure (see Fig 2)
- a. Align the mounting slot of the RCCB with the lower end of the mounting rail (slightly tilted to the right, see the dashed line in Fig 2). Push the residual current circuit breaker upward in the direction of arrow 1, and press the recess in the direction of arrow 2 to position it onto the upper end of the mounting rail. Release your hand to complete the installation.
- b. Perform the reverse of the installation process: push the RCCB upward in the direction of arrow 1, and rotate it in the opposite direction of arrow 2 to remove it from the mounting rail.
Operation & Maintenance
- 1The leakage, overload, short-circuit, and overvoltage protection settings of the residual current circuit breaker are preset by the manufacturer and should not be adjusted arbitrarily during use to avoid affecting performance. Additionally, the leakage trip device of this product is not suitable for on-site assembly with the circuit breaker.
- 2After new installation or after a certain period of operation (generally once a month), the RCCB should be tested for reliable leakage protection performance by pressing the test button while the breaker is in the closed (ON) position.
- 3When the RCCB trips due to leakage, the leakage indicator button will be activated.
- 4If the circuit breaker trips due to a fault in the controlled circuit (leakage, overload, or short circuit), the cause should be identified and the fault eliminated. Afterward, press the leakage indicator button before closing the breaker.
- 5If the breaker is damaged and cannot operate normally due to a fault in the controlled circuit, it should 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.
Eg: Order 100 units of CBRB7L-63 and CBRB7L-63s/1P+N, 30mA, C40.
Wiring Diagram
Frequently Asked Questions (FAQ)
The CBRB7L RCCB is designed to rapidly disconnect faulty power supplies when leakage current exceeds set thresholds or when someone is exposed to electric shock. It provides overload, short-circuit, residual-current (leakage), and overvoltage protection (overvoltage protection is only available on 1P+N and 2P models).
For 1P+N and 2P devices, you must connect to a 230V supply. For 3P, 3P+N, or 4P devices, Phase A (the left-most pole) and Phase C must be connected to a 400V supply to ensure the leakage-protection mechanism operates. The incoming neutral conductor "N" must also be reliably grounded.
No. The leakage, overload, short-circuit, and overvoltage protection settings are preset at the factory and cannot be adjusted. The device is non-serviceable and must not be opened or repaired.
You should test the RCCB generally once a month. With the circuit breaker in the closed (ON) position, press the test button to verify that the device trips reliably and the leakage indicator button activates.
First, identify and eliminate the fault (leakage, overload, or short circuit) in the controlled circuit. Once the fault is resolved, press the activated leakage indicator button down before attempting to switch the breaker handle back to the ON position.