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- Baseline Core Parameters (A9C20844)
| Parameter Item | Baseline Value |
| Brand/Series | Schneider Acti9 iCT |
| Pole Number/Contacts | 4P 4NO (4-pole, 4 normally open) |
| Rated Current | 40A (AC-7a) / 15A (AC-7b) |
| Coil Voltage | 220-240V AC 50Hz |
| Applicable Voltage | 400V AC |
| Utilization Category | AC-1/3/7a (Complies with IEC 60947-4-1/IEC 61095) |
| Mounting Method | 35mm Standard DIN Rail (Modular Design) |
| Dimensions | 85mm*54mm*60mm, IP20 Protection Class |
- Cross-Brand Model Comparison Table
| Brand | Series | Corresponding Model | Pole Number/Contacts | Rated Current | Coil Voltage | Mounting Method | Matching Notes |
| Schneider | Acti9 iCT | A9C20844 (Baseline) | 4P 4NO | 40A (AC-7a) | 220-240V AC | DIN Rail | Original baseline model |
| Chint | NCH8 (Modular) | NCH8-40/40 AC220/230V | 4P 4NO | 40A | 220-230V AC | DIN Rail | Perfect match: Same pole number/contacts/current/mounting method, suitable for lighting/heating/motor loads |
| Chint | CJX2 (Universal) | CJX2-4004 220V | 4P 4NO | 40A | 220V AC | Bolt/DIN Rail Optional | Industrial-grade alternative, consistent contact capacity, suitable for AC-3 operating conditions |
| Delixi | CDCH8s (Household/Modular) | CDCH8s40/40 220-240V | 4P 4NO | 40A | 220-240V AC | DIN Rail | Suitable for household/small industrial applications, similar size, ideal for lighting/heating loads |
| Delixi | CJX2s (Universal) | CJX2s-4004 220V | 4P 4NO | 40A | 220V AC | Bolt/DIN Rail Optional | Industrial-grade alternative, consistent performance parameters, suitable for motor control |
| ABB | A Series (Mounted Type) | A50-40-00*220-230V | 4P 4NO | 40A | 220-230V AC | DIN Rail | Modular design, same parameter matching, suitable for AC-1/3 loads |
| ABB | ESB (Mounted Type) | ESB40-40N-06 230V | 4P 4NO | 40A | 230V AC | DIN Rail | Industrial mounted type, suitable for lighting/heating loads, complies with IEC 60947-4 |
| Siemens | SIRIUS 3RT23 (4-pole) | 3RT2326-2BB40 | 4P 2NO+2NC (Configurable) | 40A | 220V AC | DIN Rail | Requires additional auxiliary contacts to achieve 4NO; suitable for motor loads (7.5kW/400V) |
| Siemens | SIRIUS 3RT14 (Resistive Load Dedicated) | 3RT1483-1BB40 | 4P 4NO | 40A | 220V AC | DIN Rail | Designed specifically for AC-1 resistive loads, ideal for heating/lighting systems |
| LS Electric | GMC (Universal) | GMC-40 40A 4P 4NO 220V | 4P 4NO | 40A | 220V AC | DIN Rail | Korean brand alternative, consistent parameters, suitable for industrial automation systems |
| Omron | DILM (Modular) | DILM40-10(4NO) 220V | 4P 4NO | 40A | 220V AC | DIN Rail | European standard design, suitable for AC-3 motor control (7.5kW/400V) |
III. Key Matching Guidelines
- Perfect Match Models (Highly Recommended)
Chint NCH8-40/40 AC220/230V: Fully identical structure to A9C20844, with 4P 4NO, 40A, DIN rail mounting, suitable for the same load types, and more cost-effective.
ABB A50-40-00 220-230V: Modular design, similar dimensions, meets full AC-1/3/7a operating conditions, suitable for projects with high brand compatibility requirements.
- Functional Match Models (Note Differences)
Siemens 3RT1483-1BB40: Optimized specifically for AC-1 resistive loads, not recommended for motor control with frequent start-stop cycles (AC-3).
Delixi CDCH8s40/40: Household series with a maximum rated voltage of 230V; derating or compatibility verification is required when used in 400V systems.
- Replacement Selection Precautions
- Contact Type Verification: Ensure the replacement model is 4NO to avoid control logic errors caused by configurations like 2NO+2NC.
- Utilization Category Matching:
Motor control: Must select models compatible with AC-3.
Lighting loads: Must meet AC-7a/7b (rated current 15-40A).
Resistive heating: AC-1 is sufficient for adaptation.
- Mounting and Dimensions:
Modular projects: Prioritize DIN rail-mounted models to ensure compatibility with distribution cabinet space.
Replacing existing A9C20844: Verify the width (54mm) to avoid interference during side-by-side installation of multiple units.
- Auxiliary Functions: For surge suppression or status indication, some replacement models require additional accessories (e.g., RC components, indicator lights).
- Quick Selection Recommendations
| Application Scenario | Highly Recommended Models | Alternative Models |
| Lighting Control Systems | Chint NCH8-40/40 AC220V, Delixi CDCH8s40/40 | ABB ESB40-40N-06 |
| Resistive Heating Equipment | Siemens 3RT1483-1BB40, Chint CJX2-4004 | Delixi CJX2s-4004 |
| Motor Control (≤7.5kW/400V) | ABB A50-40-00, Chint NCH8-40/40 | Siemens 3RT2326-2BB40 (Auxiliary contacts required) |
| Smart Home/Small Distribution Boxes | Chint NCH8-40/40, Delixi CDCH8s40/40 | Schneider A9C20844 (Original) |
