- Reaction score
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Being a consumer unit I would put it early 80s but could be wrong.
Who knows when something might make its way from a distributor to a building, but logo change in 1970 seems likely to place it a bit earlier.
Discuss Could someone help with the age of this DB? in the UK Electrical Forum area at ElectriciansForums.net
Being a consumer unit I would put it early 80s but could be wrong.
They must have been relatively expensive at the time ?Indeed. They have a little sealed hydraulic capsule in the magnetic circuit. When overcurrent is present, magnetic flux from the coil creates enough force on the ferrous piston inside to overcome a spring, causing it to move slowly against fluid resistance towards one end of the cylinder. When it gets there, its position decreases the magnetic reluctance of the circuit enabling the amount of flux already present to operate the tripping armature. This creates the timed response normally associated with the thermal element of an MCB. If a fault occurs, there is enough flux to cause the armature to trip the mechanism instantly, without having to wait for the hydraulic unit to respond.
Hahaha! Inspires confidence!I come across these now and again, usually date them 40+ years on EICR’s. Quite often hear them referred to as widow makers.
Reply to Could someone help with the age of this DB? in the UK Electrical Forum area at ElectriciansForums.net
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