The ABB 2CSM204135R1341, designated as TW1, is a twilight switch intended for the automatic control of electrical loads according to surrounding ambient light conditions. Instead of relying on manual operation or preset time schedules, the unit responds to changing daylight levels to switch connected circuits ON or OFF.
This device is commonly incorporated into building electrical installations where lighting needs to follow natural day-to-night transitions without continuous operator intervention.
The TW1 continuously evaluates the light level detected by its external sensing arrangement. Once the measured illumination reaches the configured switching threshold, the relay changes state to control the connected electrical circuit.
This automatic operation removes the need for daily manual switching and allows lighting schedules to follow seasonal daylight changes naturally.
| Ambient Condition | Relay Action |
|---|---|
| Light level above threshold | Switching state according to configured setting |
| Light level below threshold | Opposite switching state activated |
| Variable daylight | Automatic transition |
| Manual adjustment | Switching threshold can be configured |
Identification Details
| Description | Information |
|---|---|
| Manufacturer | ABB |
| ABB Order Code | 2CSM204135R1341 |
| Model | TW1 |
| Product Type | Twilight Switch |
| Operating Principle | Light-sensitive automatic switching |
| Installation | DIN rail |
| Mounting Environment | Indoor distribution board |
| Controlled Function | Automatic lighting control |
| Product Group | Modular control device |
Typical Installation Examples
Rather than being associated with industrial machinery, the TW1 is generally found in fixed electrical installations where lighting is controlled according to environmental brightness.
Examples include:
| Installation Area | Typical Controlled Load |
|---|---|
| Office buildings | Exterior entrance lighting |
| Commercial facilities | Parking area lighting |
| Residential complexes | Common-area illumination |
| Warehouses | Outdoor security lighting |
| Public infrastructure | Pathway and perimeter lights |
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Device Characteristics
| Feature | Description |
|---|---|
| Automatic Light Detection | Responds to natural illumination changes |
| Modular Housing | Fits standard distribution boards |
| DIN Rail Installation | Simplifies panel assembly |
| Relay Output | Controls connected lighting circuits |
| Day/Night Operation | No timer programming required |
Common Purchasing Situations
The TW1 is frequently specified when:
- Existing twilight control devices require replacement
- Building electrical systems are undergoing refurbishment
- Outdoor lighting is being automated
- Distribution panels are expanded with light-responsive control
- Spare modular control devices are maintained for facility management
The ABB article number remains the most reliable reference when matching installed equipment.
Procurement Checklist
For replacement or project procurement, installers typically compare the following information before ordering.
| Verification Item | Reference |
|---|---|
| ABB Article Number | 2CSM204135R1341 |
| Product Designation | TW1 |
| Device Category | Twilight Switch |
| Mounting Format | Modular DIN rail |
| Existing Control Method | Light-operated switching |
Using only the front appearance is not recommended because ABB modular control devices may share similar housings while performing different automation functions.
FAQ
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