People Electric · Explosion-Proof Autotransformer Motor Starter
Product overview
People Electric BQJ51 is an explosion-proof autotransformer motor starter family for project-selected motor starting. The page keeps the original model-specific selection table, outline drawings and electrical schematic. Choose one documented factory model; motor ratings, starting performance, protection and control devices must remain matched to that model and the actual load.
Technical selection summary
| Manufacturer / series | Original People Electric BQJ51 |
|---|---|
| Main supply | AC 380V; three-phase circuit shown in the manufacturer schematic. Confirm system frequency and control supply. |
| Starting method | Autotransformer reduced-voltage starting |
| Manufacturer Ex marking | Exd IIB T6 as printed; verify actual supplied unit nameplate and applicable conformity documents |
| Enclosure / corrosion protection | IP54; WF1 |
| Standards referenced | GB 3836.1, GB 3836.2 and IEC 60079 |
| Cable / entry | G1 1/2 to G3 thread entries; source cable diameter 10–25mm; final inlet/outlet count and size depend on the project |
| BQJ51-14 | Motor-power entry 14 (unit not printed in the original table); rated current 28A; CT ratio 50/5; autotransformer-power entry 14 (unit to be confirmed) |
| BQJ51-20 | Motor-power entry 20 (unit not printed in the original table); rated current 40A; CT ratio 75/5; autotransformer-power entry 20 (unit to be confirmed) |
| BQJ51-22 | Motor-power entry 22 (unit not printed in the original table); rated current 44A; CT ratio 75/5; autotransformer-power entry 22 (unit to be confirmed) |
| BQJ51-28 | Motor-power entry 28 (unit not printed in the original table); rated current 58A; CT ratio 75/5; autotransformer-power entry 28 (unit to be confirmed) |
| BQJ51-30 | Motor-power entry 30 (unit not printed in the original table); rated current 60A; CT ratio 75/5; autotransformer-power entry 30 (unit to be confirmed) |
| BQJ51-40 | Motor-power entry 40 (unit not printed in the original table); rated current 80A; CT ratio 100/5; autotransformer-power entry 40 (unit to be confirmed) |
| BQJ51-45 | Motor-power entry 45 (unit not printed in the original table); rated current 90A; CT ratio 150/5; autotransformer-power entry 45 (unit to be confirmed) |
| BQJ51-55 | Motor-power entry 55 (unit not printed in the original table); rated current 110A; CT ratio 150/5; autotransformer-power entry 55 (unit to be confirmed) |
| BQJ51-75 | Motor-power entry 75 (unit not printed in the original table); rated current 142A; CT ratio 200/5; autotransformer-power entry 75 (unit to be confirmed) |
| BQJ51-95 | Motor-power entry 95 (unit not printed in the original table); rated current 190A; CT ratio 300/5; autotransformer-power entry 95 (unit to be confirmed) |
| BQJ51-115 | Motor-power entry 115 (unit not printed in the original table); rated current 230A; CT ratio 300/5; autotransformer-power entry 115 (unit to be confirmed) |
| Utilization categories stated | AC-3 and AC-4; select contactors, transformer duty and protection for the actual motor/load rather than assuming one universal performance |
| Schematic reference | Manufacturer reference schematic shows a 0.65 autotransformer connection. Confirm the actual tap ratio, starting current/torque, starting duration and operations/hour for the supplied design. |
The model choices reproduce the original selection-table codes. Numerical current/power entries whose units are omitted in the English table require a factory-confirmed technical schedule. Do not combine a model with a different row motor rating, protection setting or CT ratio. Confirm actual control/coil supply, upstream fault protection, starting time, duty and applicable hazardous-area documentation.
Typical applications
- Reduced-voltage starting of suitably selected industrial three-phase motors.
- Project motor-control installations matching the supplied hazardous-area marking and approved electrical design.
Specify your enquiry
For a focused quotation, include:
- Factory model, motor nameplate current/power, voltage/frequency, connection and load acceleration requirements.
- Starting current/torque, duration, operations/hour, control supply and protection coordination.
- Actual Ex marking/site requirements, cable-entry count/size, final enclosure drawing, quantity and destination.
Download People Electric BQJ51 catalogue (PDF)
Product reference images and drawings
