Engineered specifically for pumps, fans and conveyors in the light-duty band — where a heavy-duty starter is overkill and a star-delta starter still leaves you a torque dip at switchover. Full function, standard interface set, 18-month warranty, engineered by a postgraduate supervisor team from Shanghai University of Electric Power.
Most installations in the 1.5–55kW band still run star-delta, which is cheap but leaves a torque dip at switchover and cannot soft-stop a pump. Heavy-duty soft starters solve that — at a size and price that overshoots the job. We build for exactly this band. Full start, stop, bypass and protection, nothing removed to make it fit.
We build for 1.5–55kW light-duty motors and do not cover heavy duty above 55kW. That focus is why the range is complete rather than compromised.
Three-phase in / three-phase out, built-in bypass, LCD display, RS485 Modbus RTU and 0–20mA analog output — standard on every model, not optional extras.
The industry offers 12. Six extra months lowers your customer's evaluation risk — and yours, because we carry it.
At the same current rating, our specification set matches Siemens 3RW, Schneider ATS02 and ABB PSS. We publish the comparison openly so you can check it yourself — no claims about their reliability, only what our unit contains.
| Specification | ShunCtrl 1.5–55kW | Typical equivalent range | Note |
|---|---|---|---|
| Power band | 1.5–55 kW light duty | Same band | Heavy duty above 55kW out of scope |
| Main circuit | 3-phase in / 3-phase out | Equivalent | — |
| Bypass contactor | Built in | Built in on equivalent models | No external bypass unit required |
| Display | LCD digital display | Digital / LED | On-site current, voltage and fault read-out |
| Communication | RS485 Modbus RTU | RS485 Modbus RTU | Standard, not an option |
| Analog output | 0–20 mA | 0–20 mA or 4–20 mA, often optional | Standard on every model |
| Protection set | Overload, phase loss, phase unbalance, short circuit, over/under-voltage | Equivalent set | Motor protection built in |
| Warranty | 18 months | 12 months typical | Six months above standard |
| Certification | CE in progress | CE / UL / TÜV as applicable | Documentation available on request |
Comparison is drawn from publicly published specifications for the referenced series. It states what our product contains and the current published warranty period of the market; it makes no claim about the reliability of competing products. Full datasheets and certified documents are issued to appointed partners.
For importers and distributors who already own the brand and the customer relationships, the only missing piece is a factory that can deliver under your name, reliably. That is what this programme is for.
Your customer sees your brand, not ours. You never have to introduce us to them.
The enclosure mould belongs to ShunCtrl alone, so no competitor of yours will ever receive an identical product from another factory.
You promise 18 months to your customer; we carry it. Written terms, not goodwill.
Front panel, labelling, packaging and documentation adapted to your market. We do not alter the mould or internal structure.
Volume-based steps, written and stable. Your margin grows with your volume — not with how hard you negotiate.
Direct access to our R&D engineers, standardised documentation, training and an after-sales process you can rely on.
Authorised white-label supply runs under a written agreement covering brand authorisation, quality-system accountability, territory protection, tooling ownership, minimum annual volume and unified technical documentation. Programme availability is confirmed case by case — contact us with your volumes and target markets.
This is our in-house load-test bank in Shanghai. Soft starters are mounted against representative motor loads, run through full start–stop cycles, and monitored on oscilloscope instrumentation. Units that do not behave correctly do not leave the building.
Panel-mount soft starters built for three-phase induction motors across the 1.5–55kW light-duty band — the range where pumps, fans and conveyors live, and where the full interface set is standard rather than optional.
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Power range | 1.5–55 kW (light duty) | Rated voltage | 380 V AC, 3-phase (50/60 Hz) |
| Main circuit | Three-phase in / three-phase out | Bypass | Built-in bypass contactor |
| Display | LCD digital display | Communication | RS485 Modbus RTU |
| Analog output | 0–20 mA | Setting | Front-panel, tool-free |
| Functions | Soft start · soft stop · bypass | Protection | Overload, phase loss, phase unbalance, short circuit, over/under-voltage |
| Series marking | PTC (model M4H14H) | Warranty | 18 months |
| Certification | CE (in progress) | R&D origin | Shanghai University of Electric Power supervisor team |
Note: headline parameters are shown for partner reference. Current range per model, full protection set, certification status and mechanical drawings are confirmed in the datasheet issued under NDA or on distributor approval. Availability of authorised white-label supply is confirmed case by case.
All three sit in the light-duty band: starting torque demand is modest, but shock and the damage it causes downstream is not. That is exactly where a soft starter earns its place.
We do not cover heavy-duty applications above 55kW. We would rather tell you where our range ends than have you specify the wrong unit.
We are a manufacturer, not a trading company. These are photographs from our own floor in Songjiang, Shanghai — production lines, assembly and test benches, finished goods and packed orders ready to dispatch. Supply continuity is a contractual commitment, not a hope.
ShunCtrl does not sell to end users directly. Your customers stay your customers — we supply you, support you technically, and stay out of your sales channel. Two routes are open: carry our brand, or put your own name on the product.
One distributor per market, agreed in writing. We do not sign a second party in a protected territory.
Volume-based price steps, published and stable. Your margin grows with your volume — not with how hard you negotiate.
Direct access to our R&D engineers when your customers have questions. You never have to guess on our behalf.
Editable English materials, specification comparison tables, application notes and demo scripts so your team can sell from day one.
Evaluation samples for you to verify, demonstrate and show to your own customers before committing.
Register named projects to secure protected pricing for the opportunities you quote. No channel conflict on your deals.
“For pumps, fans and conveyors up to 55 kilowatts, you do not need a heavy-duty starter — you need a gentle one. We cover exactly that band: 1.5 to 55 kilowatts, light duty, full function. Three-phase in and out, bypass built in, LCD display, Modbus, and a 0–20mA analog output — all standard, none of it optional. Same capability as the Siemens, Schneider and ABB ranges at the same current rating. Eighteen-month warranty instead of twelve. And the price leaves room in your project.”
Send us your country, current distribution lines and target volumes. We will reply with the distributor price list, datasheet and equivalent-specification comparison. If you want to white-label, say so and we will send the OEM terms.
WhatsApp is the fastest route. We answer enquiries in English and in your market's working language.
