Product Specifications
Brand: Siemens
Part Number: 3NJ6930-3BG21
Type: Bushing Current Transformer
Series: SENTRON 3NJ693
Primary Current: 250 A
Secondary Current: 5 A
Accuracy Class: 1
Rated Burden: 2.5 VA
Cable Diameter (max): 21 mm
Dimensions (W×H×D): 44 × 65 × 30 mm
Product Description
A pluggable bushing current transformer for SENTRON 3NJ62/63 NH1 in-line switch disconnectors with fuses. The 250/5 A ratio with Class 1 accuracy and 2.5 VA burden provides reliable current measurement for standard monitoring and control in 250 A distribution circuits.
NH1 Pluggable CT Design
Designed as a direct plug-in accessory for NH1 fuse-type switch disconnectors. Accepts cables up to 21 mm in diameter through the bushing opening. The compact 44×65×30 mm form factor fits within the disconnector footprint with no additional panel space required. No tools needed for installation or replacement.
Key Parameters
| Parameter | Value |
|---|---|
| Primary Current | 250 A |
| Secondary Current | 5 A |
| Accuracy Class | 1 |
| Rated Burden | 2.5 VA |
| Cable Diameter (max) | 21 mm |
| Dimensions (W×H×D) | 44 × 65 × 30 mm |
| Weight | 184 g |
Application
Used in NH1 3NJ62/63 switch disconnector assemblies for current measurement and monitoring in 250 A low-voltage distribution boards. The 5 A secondary is the standard interface for panel ammeters, transducers, and protection relays across industrial and commercial installations.
Related Products
- Siemens 3NJ6930-3BG11 — 250/1A NH1 bushing CT, 5 VA, for cables up to 21mm
- Siemens 3NJ6930-3DB00 — Single-CT busbar for NH1 3NJ6 switch disconnectors
- Siemens 3NJ6930-3BG12 — 250/1A NH1 bushing CT, Class 0.5 calibrated, for 21mm cables
- Siemens 3NJ6930-3BF21 — 200/5A NH1 bushing CT, 2.5 VA, for cables up to 21mm
Resources & Documentation
Siemens 3NJ6930-3BG21 SENTRON NH1 Bushing Current Transformer, 250/5A, Class 1, 21mm
Product Specifications
Brand: Siemens
Part Number: 3NJ6930-3BG21
Type: Bushing Current Transformer
Series: SENTRON 3NJ693
Primary Current: 250 A
Secondary Current: 5 A
Accuracy Class: 1
Rated Burden: 2.5 VA
Cable Diameter (max): 21 mm
Dimensions (W×H×D): 44 × 65 × 30 mm
Resources & Documentation
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