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the C Curve version is a better fit
For general higher-load circuits without heavy inrush
the WKC420B provides reliable overload and short-circuit protection while isolating all live conductors and neutral
40A C Curve Type A RCBO – combined overload
Type A RCBO – 6A B Curve, 30mA Three Phase Board the C Curve version isThe WRT106B 030 is a 6A B Curve Type A RCBO providing combined residual current and overcurrent protection in one compact device. It features switched live and neutral disconnection for full isolation, bi directional operation for solar PV and inverter fed circuits, and a high immunity design to minimise nuisance tripping. Tested to IEC EN 61009 1, this RCBO meets the 18th Edition Wiring Regulations (Amendment 2) and is suitable for domestic lighting,
