Schneider Electric ARGUS Light-Sensitive Switches with/ without Switching Delay
Operating Instructions
Model Numbers: MTN544819, MTN544894, MTN544829
For your safety
⚠️ DANGER: Risk of fatal injury from electrical current. All work carried out on the unit may only be performed by skilled electricians. Observe the regulations valid in the country of use.
Light-sensitive switch introduction
The ARGUS light-sensitive switch, with or without switching delay, can be connected to:
- Ohmic loads (incandescent lamps, 230 V halogen lamps)
- Inductive loads (NV halogen lamps with wound transformer)
- Capacitive loads (electronic transformer)
As soon as the external brightness fails to reach a set value (twilight threshold), the light-sensitive switch will switch on the connected load. When the external brightness increases again and exceeds the twilight threshold, the load is switched off.
The light-sensitive switches MTN544894 and MTN544819 also feature a switching delay function. This means the load is only switched if the twilight threshold is exceeded or not reached for a longer period. This function ensures the switch reacts only at dusk or dawn, and not due to temporary cloud cover or light from a headlamp at night.
Connections, displays and operating elements
Diagram showing the front and rear of the ARGUS light-sensitive switch. Key elements labeled: A: Opening for light sensor, B: Setting disk for twilight threshold, C: Connecting terminals, D: Light sensor, E: Openings for fixing, F: Lead-in guides for connecting cable, G: Switching delay On/Off control (for MTN544894, MTN544819). The unit also displays [CE] and [LIN] markings and is rated [IP54].
Selecting the installation site
- If possible, install the device on a north- or east-facing wall of the building.
- If possible, install the device under roof overhangs or similar covering.
- If possible, the connection cable should be inserted into the device from below. If the connecting cable enters from above, particularly good insulation must be ensured.
- Install the load to be switched (lighting) such that the light from it does not fall on the light sensor. Otherwise, the sensor cannot correctly calculate the ambient brightness (optical feedback).
Light-sensitive switch installation
Open the housing by unscrewing the two [screw]s at the front. Pull out the light-sensitive switch.
The condensation water opening on the underside of the housing must be opened. Exception: If operated in rooms subject to a large amount of dust, it must remain closed.
Illustration shows unscrewing two screws at the front of the housing to open it and pull out the switch.
Push open the condensation water opening A (view from rear) from the inside to the outside and break out the wall.
Illustration shows pushing open the condensation water opening (A) from the inside to the outside and breaking it out.
Fasten the housing to the wall through the openings using suitable fixing material (e.g. [dowel]s and [screw]s). The "TOP" marking should be at the top.
Illustration shows fastening the housing to the wall using openings with suitable fixing material like dowels and screws. The 'TOP' marking should be oriented upwards.
If you want to lead the cable into the housing from below rather than above:
Diagram illustrating how to swap lead-in guides A and B to route the cable from below instead of above.
[i] When switching inductive loads such as transformers, relays, contactors or fluorescent lamps, spikes occur which could lead to the load being switched on again ("maintained light effect"). Switch a capacitor parallel to the inductive load in order to reduce these spikes.
Wiring the light-sensitive switch for the desired application:
- Light-sensitive switch with On/Off switch (optional)
Diagram 1: Wiring for a light-sensitive switch with an optional On/Off switch. Shows connections for Live (L), Neutral (N), and the load.
- Light-sensitive switch with On/Off switch (optional) and two-way switch for toggling between manual and automatic operation.
Diagram 2: Wiring for a light-sensitive switch with an optional On/Off switch and a two-way switch for manual/automatic toggling. Shows connections for Live (L), Neutral (N), and the load.
- Light-sensitive switch with On/Off switch (optional)
Insert the light-sensitive switch into the housing and screw the housing together.
Setting light-sensitive switch
Turning the switching delay on
Turn the adjuster completely to the position "ON" (as far as possible to the left).
Illustration shows a dial or slider for setting the switching delay, with 'ON' to the left.
Turning the switching delay off
Turn the adjuster completely to the position "OFF" (as far as possible to the right).
Illustration shows a dial or slider for setting the switching delay, with 'OFF' to the right.
Setting the twilight threshold
Slowly turn the setting disk at dawn or dusk, thus closing the opening of the light sensor, until the load switches on or off.
Illustration shows a setting disk for the twilight threshold, with an opening for the light sensor.
Technical data
| Nominal voltage: | AC 230 V, 50 Hz |
|---|---|
| Max. switching current: | 10 A, AC 230 V, cosφ = 0.6 |
| Nominal power | |
| Incandescent lamps: | AC 230 V, max. 2300 W |
| Halogen lamps: | AC 230 V, max. 2000 W |
| Capacitive load: | max 140 µF |
| Connecting terminals: | for 2.5 mm² rigid conductors |
| External diameter of a cable: | max. 14 mm |
| Adjustment range/ switch threshold: | 3 - 2000 Lux, adjustable |
| Relay: | μ contact |
| Switching delay (MTN544894, MTN544819): | Switching on: approx. 40 s Switching off: approx. 100 s |
| Type of protection: | IP 54 |
| Dimensions: | approx. 97x80x47 mm (HxWxD) |
Schneider Electric Industries SAS
If you have technical questions, please contact the Customer Care Center in your country.
This product must be installed, connected and used in compliance with prevailing standards and/or installation regulations. As standards, specifications and designs develop from time to time, always ask for confirmation of the information given in this publication.
