Siemens
SENTRON 3NJ6
The SENTRON 3NJ6 series covers pluggable bushing current transformers from 150 A to 600 A, designed for direct-fit installation on Siemens 3NJ6 in-line switch disconnectors with fuses. Both 1 A and 5 A secondary outputs are available across the range. Class 0.5 models provide legal-for-trade grade accuracy for precision metering and energy audits, while Class 1 models deliver cost-effective performance for routine load monitoring. All units share a 21 mm bushing opening and snap into the dedicated accessory port without tools or additional wiring. A CT busbar for mounting up to three transformers completes the ecosystem.
Products in This Series
Click product for full specifications. Select items to request a bulk quote.
| Select | Image | Product | Key Specifications | Action |
|---|---|---|---|---|
 |
3NJ6920-3DC00 Siemens 3NJ6920-3DC00 CT Busbar, 3 Transformer Positions, NH0 | A CT busbar assembly for mounting 3 bushing current transformers onto SENTRON 3NJ6 (NH00) in-line switch disconnectors with fuses. Standard bushing. Rated up to 690 V AC / 440 V DC per IEC EN 60947-3. Modular plug-in design — retrofittable at any time without disconnecting the main circuit. Net weight: 0.189 kg. | View Product | |
 |
3NJ6930-3BG23 Siemens 3NJ6930-3BG23 250/5A Class 0.5 Legal-for-Trade Bushin | 250/5 A bushing current transformer for SENTRON 3NJ62/63 NH1 in-line fuse-switch-disconnectors. Class 0.5 accuracy with legal-for-trade calibration enables billing-grade energy measurement in compact low-voltage panels. The 14 mm cable entry fits standard NH1 feeder cables — note the 48 mm depth requires clearance behind the disconnector. | View Product | |
 |
3NJ6940-3BJ22 Siemens 3NJ6940-3BJ22 400/5A Bushing CT, Class 0.5 Accuracy f | SENTRON 3NJ6940 pluggable bushing CT for 3NJ6 in-line fuse-switch-disconnectors. Rated 400/5 A with Class 0.5 accuracy — the precision choice for 400 A feeder sub-metering and internal energy cost allocation. Fits cables up to 32 mm, installs in seconds. The lowest primary current option in the 3NJ6940 series. | View Product | |
 |
3NJ6930-3BG12 Siemens 3NJ6930-3BG12 SENTRON NH1 Bushing Current Transformer | A pluggable NH1 bushing current transformer for SENTRON 3NJ62/63 in-line switch disconnectors with fuses. 250/1 A ratio, Class 0.5 accuracy, 2.5 VA burden — legal-for-trade calibrated. Accepts cables up to 21 mm diameter. Compact 44×65×30 mm, 186 g. | View Product | |
 |
3NJ6940-3BK22 Siemens 3NJ6940-3BK22 500/5A Bushing CT, Class 0.5 Accuracy f | SENTRON 3NJ6940 pluggable bushing CT for 3NJ6 in-line fuse-switch-disconnectors. Rated 500/5 A with Class 0.5 accuracy — the precision 500 A choice for sub-metering and internal energy cost allocation where billing is not required. Same 32 mm cable window, same tool-free plug-in installation as the calibrated 3BK23. | View Product | |
 |
3NJ6940-3BL13 Siemens 3NJ6940-3BL13 600/1A Bushing CT, Class 0.5, Legal-for | SENTRON 3NJ6940 pluggable bushing CT for 3NJ6 in-line fuse-switch-disconnectors. Rated 600/1 A with Class 0.5 accuracy and legal-for-trade calibration. The 1 A secondary minimises voltage drop over long CT-to-meter cable runs — ideal for billing-grade metering where the meter is installed away from the switchboard. | View Product | |
 |
3NJ6940-3BL11 Siemens 3NJ6940-3BL11 600/1A Bushing CT, Class 1 for Economic | SENTRON 3NJ6940 pluggable bushing CT for 3NJ6 in-line fuse-switch-disconnectors. Rated 600/1 A with Class 1 accuracy — the economical 1 A option for load monitoring and protection where the meter is located away from the switchboard. Fits cables up to 32 mm, tool-free plug-in installation. | View Product | |
 |
3NJ6940-3BK23 Siemens 3NJ6940-3BK23 500/5A Bushing CT, Class 0.5 with Legal | SENTRON 3NJ6940 pluggable bushing CT for 3NJ6 in-line fuse-switch-disconnectors. Rated 500/5 A with Class 0.5 accuracy and legal-for-trade calibration — the certified 500 A choice for billing applications. Fits cables up to 32 mm, installs in seconds with no tools. For precision metering without calibration, see the 3BK22. | View Product | |
 |
3NJ6940-3BL12 Siemens 3NJ6940-3BL12 600/1A Bushing CT, Class 0.5 Accuracy f | SENTRON 3NJ6940 pluggable bushing CT for 3NJ6 in-line fuse-switch-disconnectors. Rated 600/1 A with Class 0.5 accuracy — the precision 1 A choice for sub-metering where the energy meter is located away from the switchboard. Same 32 mm cable window and tool-free installation as the 5 A variants. | View Product | |
 |
3NJ6940-3BL22 Siemens 3NJ6940-3BL22 600/5A Bushing CT, Class 0.5 Accuracy f | SENTRON 3NJ6940 pluggable bushing CT for 3NJ6 in-line fuse-switch-disconnectors. Rated 600/5 A with Class 0.5 accuracy — the precision sweet spot for sub-metering and energy monitoring where billing is not required. Same measurement performance as the calibrated 3BL23 without the certification cost. Fits cables up to 32 mm, installs in seconds. | View Product | |
 |
3NJ6940-3BL21 Siemens 3NJ6940-3BL21 600/5A Bushing CT, Class 1 for Cost-Eff | SENTRON 3NJ6940 pluggable bushing CT for 3NJ6 in-line fuse-switch-disconnectors. Rated 600/5 A with Class 1 accuracy — the economical choice for load monitoring, protection confirmation, and non-critical current measurement. Same 32 mm cable window and tool-free plug-in installation as the higher-accuracy variants in the series. | View Product | |
 |
3NJ6940-3BK21 Siemens 3NJ6940-3BK21 500/5A Bushing CT, Class 1 for Cost-Eff | SENTRON 3NJ6940 pluggable bushing CT for 3NJ6 in-line fuse-switch-disconnectors. Rated 500/5 A with Class 1 accuracy — the economical 500 A choice for load confirmation, overload detection, and non-critical current measurement. Same 32 mm cable window and tool-free installation as the precision variants in the series. | View Product | |
 |
3NJ6930-3BF21 Siemens 3NJ6930-3BF21 SENTRON NH1 Bushing Current Transformer | A pluggable NH1 bushing current transformer for SENTRON 3NJ62/63 in-line switch disconnectors with fuses. 200/5 A ratio, Class 1 accuracy, 2.5 VA rated burden. Accepts cables up to 21 mm diameter. Compact 44×65×30 mm footprint. Weight: 162 g. | View Product | |
 |
3NJ6940-3BL23 Siemens 3NJ6940-3BL23 600/5A Bushing CT, Class 0.5 with Legal | SENTRON 3NJ6940 pluggable bushing CT for 3NJ6 in-line fuse-switch-disconnectors. Rated 600/5 A with Class 0.5 accuracy and legal-for-trade calibration — the certified choice where energy measurements must stand up to billing scrutiny. Snaps onto cables up to 32 mm with no tools and no wiring changes. For precision sub-metering without calibration cost, see the 3BL22. | View Product |
Swipe to see more columns
No products match your filter. Try a different keyword.
Need Help Finding the Right Part?
Our team of automation experts is ready to assist you with product selection, pricing, and technical specifications.