Drop-in replacement for GE JAK-0C and Alta COM-6. Amorphous alloy core, anti-UV epoxy body, sealed secondary junction box — built for long-term outdoor metering on LV distribution systems.
Low-voltage (0.75kV) outdoor CTs are the standard way to meter LV feeders, service entrances and sub-distribution circuits where the current is too high for a direct-connected meter.
Feeds 1A / 5A inputs of CT-operated energy meters on LV feeders, service drops and tenant sub-metering.
Round-window, cable-through design fits standard LV metering pans and metering cubicles without re-machining.
Revenue metering where ANSI C57.13 accuracy class 0.15 is specified for billing.
Same ratings and footprint as GE JAK-0C / Alta COM-6 — swap the unit, keep the mounting and the cable entry.
If you are still running GE JAK-0C or Alta COM-6 units, the UTCT is a drop-in substitute — same ratings, same accuracy class, same installation footprint.
| Parameter | GE JAK-0C | Alta Series COM-6 | UNISUN UTCT |
|---|---|---|---|
| Max system voltage | 0.75 kV | 0.75 kV | 0.75 kV (750 V) |
| Rated primary current | 5 – 1000 A | 5 – 1000 A | 5 – 1000 A |
| Secondary current | 5 A (1 A on request) | 5 A (1 A on request) | 1 A or 5 A, customized |
| Accuracy class | ANSI 0.15 | ANSI 0.15 | ANSI 0.15 / IEC 0.15S |
| Installation footprint | Original mounting | Original mounting | Same — no re-design needed |
| Window | Round window, cable through | Round window, cable through | Round window, cable through |
| Secondary box | Junction box | Junction box | Sealed, stainless steel lead-seal screws |
| Standard | ANSI C57.13 | ANSI C57.13 | ANSI C57.13 / IEC 61869 |
If you are searching for a GE current transformer replacement, the UNISUN UTCT covers every ratio GE listed for the JAK-0C range, 100:5 through 1000:5, with the same 0.75 kV maximum system voltage, the same ANSI 0.15 / IEC 0.15S accuracy class and the same Ø80 mm window. Below is the model-to-model cross reference we use when a customer sends a nameplate photo.
| Model you have now | Ratios we supply | Order as |
|---|---|---|
| GE JAK-0C current transformer (also written GE JAK 0C, JAK-0C, JAK-0C CT) | 100:5 · 200:5 · 300:5 · 400:5 · 500:5 · 600:5 · 800:5 · 1000:5, single or dual ratio | UTCT 400:5 (state ratio) |
| Alta COM-6 current transformer (also written COM-6, COM 6, Alta COM-6 CT) | 100:5 – 600:5, 1 A or 5 A secondary | UTCT 400:5 (state ratio) |
| GE JAK-0C wound-primary, 1 A secondary | Any ratio in the table above with 1 A secondary | UTCT 400:1 |
How to confirm: send the nameplate photo or the JAK-0C catalog number and we reply in writing with the equivalent GE JAK-0C replacement model, the drawing and the price. Nothing on the mounting or the cable entry has to change — the COM-6 and JAK 0C footprints are matched.
UNISUN ELECTRIC is a current transformer manufacturer in the Philippines market supply chain — we ship direct from our factory to Manila, Cebu, Davao and Subic, and we also act as an instrument transformer supplier Philippines buyers use for CT/PT packages: current transformers, voltage transformers, combined metering units, 11 kV and 33 kV outdoor epoxy CTs. Every unit ships with a routine test report.
Ratings shown for the original models are those published for the types this product replaces. Send us your nameplate photo or the original datasheet and we confirm the equivalent UTCT model in writing.
Standard range below — ratios, burden and accuracy class can be built to your project specification.
| Item | Value |
|---|---|
| Type | UTCT (standard) · ERCT (extended range) — see note below |
| Accuracy range | UTCT: from 10% of rated current to rating factor · ERCT: from 1% of rated current to rating factor |
| Construction | Outdoor, epoxy resin cast, dry type |
| Max. system voltage | 0.75 kV (750 V) |
| Rated frequency | 50 / 60 Hz |
| Rated primary current | 5 / 10 / 15 / 20 / 25 / 30 / 40 / 50 / 75 / 100 / 150 / 200 / 300 / 400 / 500 / 600 / 800 / 1000 A |
| Secondary current | 1 A or 5 A (customized) |
| Accuracy class | IEC: 0.15S / 0.15 / 0.3 / 0.6 · ANSI: 0.15 |
| Rated output (burden) | Up to 20 VA |
| Core | Amorphous alloy (metering) · CRGO (protection) |
| Winding | High-purity enameled copper wire, electrolytic copper primary |
| Insulation / housing | Anti-UV outdoor epoxy resin, 10-year outdoor service life |
| Secondary box | Sealed design, waterproof, stainless steel lead-seal screws, cable exit from top |
| Standards | ANSI C57.13 · IEC 61869 |
| Ambient temperature | −20 °C to +70 °C |
| Humidity | Monthly average 95 %, daily average 90 % |
| Installation altitude | ≤ 1000 m |
Same outdoor epoxy body, same footprint, same ratio — but the 0.15 class is held from 1% of rated current up to the rating factor, not only from 10%. That is what Philippine tenant metering, sub-metering and EV-charging circuits need when the load sits far below the CT rating most of the day.
A standard CT is specified from 10% of rated current. ERCT keeps 0.15 class down to 1% — so a 400:5 CT still meters correctly when the load drops to a few amps at night.
Accuracy is guaranteed across the whole range, from 1% of rated current up to the rating factor — no accuracy gap between light load and overload.
Identical body, mounting and secondary box as the UTCT. Only the model code changes: ERCT 400:5 instead of UTCT 400:5.
| Item | UTCT (standard) | ERCT (extended range) |
|---|---|---|
| Accuracy class | 0.15S (IEC) / 0.15 (ANSI) | 0.15 class from 1% of rated current to RF |
| Class guaranteed from | 10% of rated current | 1% of rated current |
| Ratios / secondary | 5:5 – 1,000:5 · 1 A or 5 A | Same · single or dual ratio |
| Body | 0.75 kV outdoor epoxy, sealed box | Identical body and footprint |
| Typical use | Steady loads near rated current | Tenant metering, sub-metering, EV charging, seasonal / night-heavy load |
| Order code | UTCT 400:5 | ERCT 400:5 |
We manufacture instrument transformers in our own factory in Wenzhou, China — you buy direct, with the drawings and test documents you need for approval.
No trading company in between — a direct manufacturer quotation for your quantity and port.
Outline drawing, routine test report with every unit, type test reports on request.
Ratio, secondary current, burden, accuracy class, lead length and terminal arrangement to your requirement.
Send these six items (or just a photo of the old nameplate) and you get a confirmed model and price within 24 hours.
e.g. 200/5 A, 400/5 A, 600/5 A — or the load current so we can size it.
1 A or 5 A, and the burden in VA (max 20 VA).
0.15S / 0.3 for billing metering, 0.6 for indication.
Pieces per ratio and destination port (Manila / Cebu / Davao).
Questions we get from panel builders, electrical contractors and metering projects in the Philippines.
Fill in the ratio and quantity — we reply within 24 hours with the confirmed model, unit price and delivery time to your port.
Send a photo of the nameplate on WhatsApp — we reply with the matching UTCT model and price.
Same factory, same testing — CT and PT for indoor and outdoor, epoxy cast and oil immersed, from 0.66kV up to 36kV. Every unit ships with a routine test report.
