EKL5-63B Type B RCBO—Professional Residual Current Circuit Breaker for AC, Pulsating DC, and Smooth DC Leakage Protection

EKL5-63B Type B RCBO (Residual Current Circuit Breaker with Overcurrent protection) is a combined protective device that integrates residual current protection (RCD) and overcurrent protection (MCB), with a rated current up to 63A. It supports single-phase 230/240V and three-phase 400/415V systems, features a 10kA breaking capacity, and meets IEC61009-1 and IEC62423 standards.

Type B RCBOs are specifically designed to detect smooth DC residual currents, as well as AC and pulsating DC currents. This makes them ideal for applications such as industrial environments with variable speed drives, solar panel systems, EV charging stations, commercial distribution boards, and residential installations where enhanced earth leakage protection is required.

Product Benefits

  • Triple Protection: Simultaneously safeguards against overloads, short circuits, and all types of earth leakage currents (AC, pulsating DC, pure DC).

  • DC Sensitive Safety: Type B functionality delivers extended protection where conventional RCBOs cannot, essential for emerging technologies and electronic loads.

  • Reliable & Versatile: Wide selection of current ratings (6A–63A) and pole options, suitable for residential, commercial, and industrial distribution systems.

Q: How is a Type B RCBO different from a B Curve RCBO? Does EKL5-63B support different tripping curves?

A: A Type B RCBO refers to its capability to detect a wide spectrum of residual (earth leakage) currents—including AC, pulsed DC, and smooth DC, as defined by IEC 62423. This detection function distinguishes it from standard RCBOs and is crucial for protecting modern equipment such as EV chargers, solar inverters, and variable speed drives.

On the other hand, “B Curve,” “C Curve,” and “D Curve” refer to the overcurrent tripping characteristics of the circuit breaker part, which determine how the RCBO responds to overloads and short-circuits.

  • B Curve: Suited for resistive loads (trips at 3~5 x In)

  • C Curve: Suited for general mixed loads (trips at 5~10 x In)

  • D Curve: Suited for highly inductive loads/motors (trips at 10~20 x In)

The EKL5-63B is a true Type B RCBO (leakage detection type), and also offers selectable B, C, or D overcurrent curves. This means you benefit from both advanced earth leakage protection (Type B) and flexible overcurrent protection tailored to your load requirements.

In summary, “Type B” and “B/C/D Curve” define two distinct features of this RCBO—residual current sensitivity and overcurrent tripping characteristic, respectively.