A motion detector in the bathroom

In times of high electricity costs, many people resort to simple means of saving some electricity. An economical alternative to the conventional light switch in the bathroom is a motion detector in the bathroom. However, some peculiarities should be considered.

Save energy with motion detectors

Motion detectors can not just switch one consumer. On the motion detector can also be set how long the consumer, for example, a light source to be controlled. Then conventional light switches can be replaced wherever you quickly forget to switch them off:

  • in front of the house
  • in the entrance area
  • staircase
  • hallway
  • bathroom

Basic requirements for motion detectors in the bathroom

In the bathroom, however, a motion detector must have some basic features. Thus, the device should have a high IP rating (dust and moisture proof). This applies to the connection area as well as the motion detector itself.

Differentiation according to motion detector types

In addition, a distinction must be made between the different types of motion detectors:

  • PIR or IR detector (infrared)
  • HF, radar or microwave detector
  • Photocell detector

PIR or RF detector

Infrared motion detectors must not be obstructed to monitor a specific area. In contrast, HF detectors can also be installed hidden behind walls or other components (in the house under the ceiling) and still function flawlessly.

In the bathroom, this may be the case if a shower with a shower curtain or frosted glass is installed. If you are standing in the shower, an IR motion detector may not detect your movements and the light will switch off prematurely.

Possibly the motion detector should be switchable

In addition, there are situations in which one has to stay longer in the bathroom or toilet. Then it would of course be uncomfortable if the circuit is made too short a time. Therefore, motion detectors for such situations should either have an internal switch or be installed in addition to the motion detector, a circuit.

Operation with LED bulbs

In addition, modern bulbs must be considered. More and more households use LED bulbs instead of incandescent bulbs or energy-saving bulbs. These require only a fraction of the power of the other mentioned devices. The circuit of the motion detector must correspond to the power consumption of the consumer.

Residual current and LED consumers

In addition, a motion detector can transmit residual current. That would be for the LED, as if it is in continuous operation. This is important because the life of LED bulbs is not defined by the switching on and off, but the operating time.

Therefore, a circuit with LED must always be set so that the phase L (current carrying) is switched via a switch and not the neutral conductor N. Well suited for use in combination with LED bulbs are motion detectors, which integrates a current interrupt relay to have.

Tips & TricksIf you want to connect your motion detector to the bathroom, see "Connecting Motion Detectors" for detailed instructions to help you understand the wiring diagram.
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