Hybird offers three types of smart breakers, each providing different protection. This guide helps installers select the right type for each circuit.
Hybird RCBO (HY-RCBO)
The RCBO combines overcurrent protection and earth leakage (residual current) protection in a single device. Hybird's RCBOs function as a paired RCD and MCB. It is the most versatile Hybird breaker and the most commonly installed.
Use an RCBO when:
The circuit requires both overcurrent and earth leakage protection (most circuits).
You want individual earth leakage protection per circuit, so a fault on one circuit does not trip other circuits.
The installation does not have a separate upstream RCD.
Available in 2-pole (single-phase) and 4-pole (three-phase) configurations. C curve is standard stock. B curve is available made-to-order with approximately 4 weeks lead time. Both curves are available with the same residual current capability. Type B residual current detection (for DC-capable equipment) is a capability of the RCBO.
Hybird MCB (HY-MCB)
The MCB provides overcurrent protection only. It does not detect earth leakage.
Use an MCB when:
Earth leakage protection is provided by a separate upstream RCD.
The circuit does not require individual earth leakage protection.
You need 1-pole, 2-pole, 3-pole, or 4-pole configurations for flexibility in panel design.
MCBs are typically used in combination with an upstream Hybird RCD, which provides earth leakage protection for a group of MCB-protected circuits.
Hybird RCD (HY-RCD)
The RCD provides earth leakage protection only. It does not provide overcurrent protection.
A Hybird RCD is used in combination with an MCB — an RCD in isolation is not useful for panel protection. The installer chooses how to combine RCDs and MCBs to achieve the desired protection scheme.
Use an RCD when:
You need a group earth leakage protection device upstream of several MCBs.
The installation design separates overcurrent and leakage protection (common in larger commercial panels).
Type B is standard stock (detects AC, pulsating DC, and smooth DC leakage — required for EV chargers, variable frequency drives, solar inverters, and similar DC-capable equipment). Type A is available made-to-order. Only C curve RCDs are readily available.
Available models: HY-RCD-R252P3B (25A, 2P), HY-RCD-R404P3B (40A, 4P), HY-RCD-R634P3B (63A, 4P). Sensitivity options: 30 mA, 100 mA, 300 mA.
Common configurations
Residential / small commercial: Hybird RCBOs throughout. Each circuit gets individual overcurrent and leakage protection. Simple and effective.
Larger commercial / industrial: Upstream Hybird RCD (Type B standard) protecting a group of downstream Hybird MCBs. This reduces cost per circuit and allows flexible grouping of earth leakage zones.
Mixed: Some circuits on RCBOs (for individual protection), others on MCBs under a group RCD. Common when certain circuits require Type B protection while others use standard protection.
All Hybird breakers include
Regardless of type, every Hybird smart breaker includes RS485 Modbus communication, per-circuit measurement (voltage, current, power, leakage, temperature), remote on/off state reporting, and a unique Modbus ID for identification on the bus.
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