Ex workshop spare parts and R&D/manufacturing stock
ALL components were sourced through reputable local distributors such as RS Electronics, Farnell, WES and Rockby (Victoria) or direct from the manufacturer.
Old stock, around the early 2000's!
I have two of these available, the ONLY difference between them is that one transformer has the dual secondaries already connected together in parallel, providing 12V AC output at around 25 Amp capability
The second transformer is exactly as received from the manufacturer - the two secondary windings are untouched, so this transformer can immediately be used as a dual 12V output or the windings wired in parallel for a high current capable 12V AC supply OR in series to provide 24V @ 12.5 Amp
Please specify if you have a preference regarding the secondaries, "virginal" or already wired in parallel
HARBUCH ELECTRONICS - Toroidal Power Transformer
Made in Australia (Sydney)
I suspect Harbuch is going through a period of "transition" as their website appears to be only partially active and I read somewhere that the original owner (Rod) was retiring
Model: H2412
Label on one side of the core reads:
HARBUCH ELECTRONICS Pty Ltd
Safety Approvals
AS3108-1994 CS/776/Q
EN60742
HARBUCH ELECTRONICS PTY LTD
ANTRIM H2412 300VA
PRIM 240V ORG-ORG
SEC 1: 12V/12.5A RED-YEL
SEC 2: 12V/12.5A BLU-GRY
(Old Australian Made "Boomerang" graphic sticker to the right side)
Dual (Isolated) secondaries: 12V @ 150VA (around 12.5A full load) each winding
Both secondaries are currently wired (strapped) in phase and in parallel (for greater current capability but still at 12V)
Originally these were one product being evaluated for battery charger designs and in the end, this HARBUCH transformer won out.
All windings are colour coded and easy to identify
Orange - Orange: 240V AC Primary winding (not multi-tap, just 240V input)
Secondary 1: .Red & Yellow
Secondary 2: .Blue & Grey
. indicates "start of winding"
NOT POTTED (no epoxy resin filling/no mounting hole predrilled)
NO mounting hardware supplied (rubber or plastic discs, metal disc and central bolt)
PHYSICAL MEASUREMENTS:
110mm diameter
40mm centre hole
55mm height
All secondary flying leads 175mm length
Primary leads enamelled copper wire, solid core **NOTE** The primary wires of "transformer A" are much shorter (65mm), I am not sure why, perhaps in preparation for the prototyping work. The primary wires for "Transformer B" are the normal length of 200mm
Secondary leads are also solid core, enamelled copper wire, ends tinned
As the photograph shows, on "transformer A" the two secondaries are "strapped" together.
Transformer has a packed weight of 2.5Kg
COSMETIC CONDITION:
NEW, never actually put to commercial use (R&D spare part)
I have stripped back the insulation on the orange primary leads (and tinned the ends) so I could make my test measurements below.
TESTING:
To confirm the transformer is functioning properly, I have made some simple "open circuit/no load" tests of both transformers (A & B)
Secondary 1 & 2 measures: 12.8V AC
Transformer A: Secondaries currently strapped in parallel to give a nice grunty current 25A capability (this type of transformer was being used for R&D in relation to Lead-Acid battery chargers) but of course you can cut away the straps and end up with 2x 12V AC outputs @ 12.5A capability EACH WINDING.
Transformer B: Absolutely untouched since being received from Harbuch
Confirmed total isolation between Primary & Secondary windings and both secondaries are separate windings.
