ElectricalXpress > Information > Circuit Breakers | MCB General Wiring Accessories. Batten Holders. Cable Jointing Accessories. Junction Boxes. Cord Related Accessories - Standard. Extension Sockets. Mounting Accessories. NHP - RCBO 2P 6KA 30MA 10A MOD6 Price: $26 ($28 incl GST) Qty: Add to cart See details. MOD6RCBO21630. NHP - RCBO 2P 6KA 30MA 16A MOD6 Electrical Forum -assistance for electrical trade people Apr 20, 2017The total load they can pass before tripping is 50A, so the 40A RCD will overload. If they were RCBOs, no problem, they would trip when they go over 40A. Am I wrong in thinking RCDs have no current trip? Usually, a Fault Current spec, like 6kA would indicate an RCBO..? Two are definitely NHP Mod6 RCCBs as stated on the face.