1. You recommend using an RC snubber for contactors. However, the contactors you usually use are operated with AC voltage. Is it recommended to use an RC snubber for 12V DC contactors as well? Or is it relevant for AC only?
2. What does the RC snubber actually protect? Is it the circuit that feeds the control voltage to the contactor, or the output load consumers? Or both?
3. I couldn't find on the market contactors with built-in RC snubber as you sell. It is never mentioned. Even with big companies like ABB. Why is that? Is it your own idea to insert the snubber inside the module? Or maybe they put it and just don't mention it?

Thanks a lot,
Elad

The contactors sold at Kincony's store are operated with 230V AC.
1. Can you recommend other contactors that use 12V DC for operation?
2. Are there any downsides for using 12V DC contactors instead of 230V AC ones?

Thanks,
Elad

Is it possible to work with more than one DS18B20 in the same channel of the COL-B?

I would like to monitor more than 5 temperature points...

Add the repository URL under Supervisor->Add-on store->...->Manage add-on repositories:

https://github.com/zigbee2mqtt/hassio-zigbee2mqtt

data_path: /config/zigbee2mqtt
external_converters: []
devices: devices.yaml
groups: groups.yaml
homeassistant: true
permit_join: false
mqtt:
  base_topic: zigbee2mqtt
  server: mqtt://192.168.2.220:1883
  user: mqtt
  password: '123'
serial:
  port: /dev/ttyACM0
advanced:
  log_level: info
  pan_id: 6754
  channel: 11
  network_key:
    - 1
    - 3
    - 5
    - 7
    - 9
    - 11
    - 13
    - 15
    - 0
    - 2
    - 4
    - 6
    - 8
    - 10
    - 12
    - 13
  availability_blocklist: []
  availability_passlist: []
device_options: {}
blocklist: []
passlist: []
queue: {}
frontend:
  port: 8099
experimental: {}
socat:
  enabled: false
  master: pty,raw,echo=0,link=/tmp/ttyZ2M,mode=777
  slave: tcp-listen:8485,keepalive,nodelay,reuseaddr,keepidle=1,keepintvl=1,keepcnt=5
  options: '-d -d'

sensor:
  - platform: mqtt
    name: Voltage
    state_topic: "zigbee2mqtt/0x00158d00067ec29e"
    value_template: "{{ value_json.battery }}"
    unit_of_measurement: "%"
    availability_topic: "zigbee2mqtt/bridge/state"
    payload_available: "online"
    payload_not_available: "offline"
    qos: 0
    device_class: battery

  - platform: mqtt
    name: signal
    state_topic: "zigbee2mqtt/0x00158d00067ec29e" 
    value_template: "{{ value_json.linkquality }}"
    availability_topic: "zigbee2mqtt/bridge/state"
    payload_available: "online"
    payload_not_available: "offline"
    qos: 0
    device_class: signal_strength

  - platform: mqtt
    name: click
    state_topic: "zigbee2mqtt/0x00158d00067ec29e"
    value_template: "{{ value_json.click }}"
    availability_topic: "zigbee2mqtt/bridge/state"
    payload_available: "online"
    payload_not_available: "offline"

I would like to use COL to set a time function + a light sensor. i have already wired everything, but i can't program how i want: i would like it from 22 to 7 every day, if DI4 = 1, then k27 on for 10 seconds. I don't find the specific way to set the function from 10pm to 7am thank you

I'm testing a NTC Thermistor with analog input of COLB.
An NTC 103AT in series with a 10k resistor.
Both connected to +5V and input A1.

The voltage measured at input A1 is different from the calculated one (VA1 = 10k x 5/(RThermistor + 10k).
It seems that the A1 input impedance is low and influences the circuit.
Can you help me with that?

Thanks!

As suggested, I consider using SSR relays as secondary relays to protect the built-in relays from load. My load is for lighting/blinds only (each channel should require < 300W).

I noticed that the SSRs are typically sold for loads of 10A/25A/40A. The prices are quite the same (the extra load capacity costs a few extra cents). I also noticed that when the environmental temperatures gets higher a 10A SSR can withstand <10A load (the same goes for the 25A & 40A SSRs). Why shouldn't I just purchase the 40A to maximize its life expectancy?

Lets assume I use a fixed eventual load of 5A for the lighting channel (for example). Does the 40A SSR require a higher *operating load* than the 10A SSR, and by so might wore more the actuator's built-in relay?

Thanks a lot!
Elad