Used But Good Condition. Crabtree Loadstar Range MCB. Early Style Series 2 Approx – Crabtree Loadstar MCB 20 Amp Single Pole Breaker Type B 20A . Product Description. Crabtree Loadstar 6HS16C C Type 16A Single Pole Mcb. 6HS16C is a 16A out going MCB for Crabtree Loadstar commerial/industrial. Product Description. Crabtree Loadstar 6HS16B B Type 16A Single Pole Mcb. 6HS16B is a 16A out going MCB for Crabtree Loadstar commerial/industrial.

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For the MCB to be the cause, there would have to be a path for the lost current to take. This is after I toggled mcb switch a dozen times! Else, yes, just drop the busbar, lift out the mcb, drop new one in and refit busbar.

And don’t forget that just switching off the MCB does not fully isolate the circuit. I was not thinking when writing thread sorry but thanks for highlighting it!! New cable through house to a junction box situated under cover in dry position supplying two power points to ip67 on house wall One power point supplying small pump Last week rcd tripped.

Disconnected both sockets from junction box. I am still intrigued as to why it is knocking off the RCB as absolutely nothing has touched the cable and the run from the cu to the the adjoining shed is all indoors. Do you already have an account? TBH I think you are better getting someone in for this. I now need to replace a suspect mcb Looking at the photographs of the cu can you tell me if I need to undo the bottom screw of every mcb in that sector to take off the copper neutral bus bar before I can take out the suspect mcb by pulling down the back release ring on the mcb etc.


Not likely to be mcb at fault. It is a Loadstar. Again thank you all for your help.

Crabtree Loadstar MCB 20 Amp Single Pole Breaker Type B 20A 6M1B20 Series 2

Perhaps the UV got to it? OP have you tried to remove the breaker? RCD trip due to there being a difference in the current going out through the live and the current returning through the Neutral. Hi spinlondon thanks cable fully enclosed. Alun Tom and unphased like this. You would spend more lucrative time just visually inspecting all your garden stuff. Its not, JP, they have special shrouded busbars and a single tab lock-in system unique to the Starbreaker.

RCDs will also trip if too much current returns via the Neutral, something associated with shared neutrals.

The cable runs are enclosed in plastic trunking so it should not be affected by vermin!!!! Symptoms are this Peter p There is a dedicated mcb for the garden The circuit was installed from lpadstar some 5 years ago.

The circuit in question needs meggering, doesn’t sound like an mcb problem to me. Alun Tom likes this. BazzaApr 26, I am glad you corrected me on that issue!

You should find water problems in at least one of them. There is no issue re moisture as this is all in the dry As mcb Has anyone seen this typ3 of thing before? Yes my fault re polarity of bus bar!!


Usually caused by some or all the current crqbtree to Earth due to a short on either the live or Neutral conductors. May I thank you all for you contributions to my query. The mcb will not move Clip pulled down but no movement on this mcb or on other individual mcb if trying individually to remove even with bus bar screw released.

Crabtree Loadstar 6HS16B B Type 16A Single Pole Mcb – Your Electrics | Electrical Supplies

Yes I have thought of it but discounted that as a cause!! The ends of the supply wire temporarily terminated by a choc box connector At present still tripping in that state but yesterday when reconnected to the socket worked for approximately 6 hours without tripping anything then mid evening As other poster said that aint the neutral bar it is the LIVE busbar.

Thanks peter but no. Alun TomApr 25, Share This Page Tweet. Maybe the MCB has another circuit connected to it. Crabtrwe not see daylight! Have you had any little furry visitors having a chew at the cable?

Yes, my password is: Log in or Sign up. Looks more like a Starbreaker db to me. It should be possible to lift it off the busbar without undoing all of the mcbs to drop it.

To do this you would also need to remove the neutral of the suspect circuit. The screw is already loose.