Knowledge Base › Current Transformers (CT)
Siemens 4NC5440-2DM21
Official manufacturer GLOBAL verified Sept. 23, 2026
Extracted from datasheet (page 1)
Identity
| category | current_transformers |
| manufacturer | Siemens |
| model | 4NC5440-2DM21 |
| product_status | active |
| region | GLOBAL |
| variant | — |
Electrical
| accuracy_class |
0.5
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| aperture_mm |
41
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| bidirectional | True |
| burden_va |
25
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| busbar_aperture_mm |
64 mm max single busbar; 51 mm max dual busbar
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| ct_type |
solid_core
disputed
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| frequency_hz |
[50, 60]
disputed
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| max_current_a | 65.0 |
| measurement_type | Current Transformer (CT) |
| phase_count | 1 |
| primary_current_a |
2500
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| rated_burden_va |
25
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| rated_insulation_voltage_kv |
3
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| rated_insulation_voltage_v |
3000
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| ratio |
2500/5 A
disputed
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| secondary_current_a |
5
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| terminal_type |
screw-type output terminals
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| voltage_rating_v | 230.0 |
Physical / mechanical
| dimensions_mm |
Height: 127.5 mm, Width: 112 mm, Depth: 77 mm
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| mounting | DIN-rail |
| opening_height_mm |
36
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| weight_kg |
1.259
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
Environment
| ip_rating |
IP20
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| operating_temperature_max_c |
55
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| operating_temperature_min_c |
-30
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| storage_temperature_max_c |
70
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
| storage_temperature_min_c |
-30
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
Interfaces & connectors
| communication | RS485 Modbus RTU |
Protection
| touch_protection |
True
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
Certifications
| standards |
['IEC 61869-2']
SENTRON current transformer 4NC5440-2DM21 - TED data sheet
|
Documents
Recorded conflicts
electrical.frequency_hz Review required
[50, 60] — stored value
50/60 — Rated frequency 50/60 Hz
Detected during import deep-enrich-2026-09-batch10
electrical.ct_type Review required
solid_core — stored value
Bushing-type current transformer — Bushing-type current transformers
Detected during import deep-enrich-2026-09-batch10
electrical.ratio Review required
2500/5 A — stored value
500:1 — Transformation ratio 500:1
Detected during import deep-enrich-2026-09-batch10
Additional documented parameters
Recorded verbatim from the source; no schema field exists for these yet.
| builder_completeness | partial |