Hydrogen recirculation in series with an ejector, up to 150 kW systems
Explosion Proof Circulating Pump
Shaftless, fully sealed · 7 models · 300–1500 slpm · up to 800 V
Hydrogen circuit
Overview
A hydrogen circulation pump for fuel-cell systems up to 150 kW. The impeller is driven without a shaft connection, so there is no dynamic seal; the partition seals the gas path completely — explosion-proof by construction. The disc motor design reduces noise by 10% compared with radial-flux motors, service life reaches 20,000 h, and volume is reduced by 50% and weight by 60% — under 4 kg complete.
Key features
- No shaft connection between impeller and motor — no dynamic seal
- Sealing partition removes the ignition path entirely
- Disc motor: 10 % lower noise, compact structure
- 20,000 h service life cuts replacement and maintenance cost
- CAN 2.0B communication, IP6K7 protection
Specification
Technical data
Model selection
| Parameter | KG300 | KG500 | KG700 | KG1000 | KG1500 | KG HV | KGH 125 °C |
|---|---|---|---|---|---|---|---|
| Rated voltage | 24 V | 24 V | 540 V | 540 V | 540 V | 800 V | 540 V |
| Rated power | 500 W | 650 W | 850 W | 1200 W | 2200 W | 1200 W | 1200 W |
| Rated flow (H₂) | 300 slpm | 500 slpm | 700 slpm | 1000 slpm | 1500 slpm | 1000 slpm | 1000 slpm |
| Pressure rise | 15 kPa | 15 kPa | 15 kPa | 15 kPa | 20 kPa | 15 kPa | 15 kPa |
| Speed (rpm) | 24000 | 24000 | 24000 | 22000 | 18000 | 22000 | 22000 |
| Integration | Integrated | Integrated | Separate | Separate | Separate | Separate | Separate |
| Env. temp. range | −40…+65 °C | −40…+65 °C | −40…+85 °C | −40…+85 °C | −40…+85 °C | −40…+85 °C | −40…+85 °C |
| Medium temp. range | −40…+85 °C | −40…+85 °C | −40…+85 °C | −40…+85 °C | −40…+85 °C | −40…+85 °C | −40…+150 °C |
Common specifications
| Item | Specification |
|---|---|
| Communication | CAN 2.0B |
| Protection level | IP6K7 |
| Cooling | Motor and controller air cooling |
| Dimensions | 160 × 170 × 137 mm (KG300/500); pump 164 × 120 × 149 mm + controller 276 × 198 × 95 mm (larger models) |
| Mounting | 6 × M6 bolts at 15 ± 2 N·m |
Application
Where it is used
KG300/KG500 — integrated 24 V units for small fuel-cell systems
KG700–KG1500 — 540 V with separate controller, up to 2200 W
KG HV 800 V variant and KGH high-temperature version for 150 °C media
More in hydrogen circuit
Related reading
From the engineering notes
Background on the design decisions behind this component — all articles.
What a fuel cell stack expects from its balance of plant
A stack presents four interfaces — hydrogen, air, coolant and DC bus. Match each one with the right parts and integration gets much simpler.
Explosion Proof Circulating Pump — product brochure (PDF)
Full specifications, model selection tables and engineering notes. Two pages, English.
Download PDF
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