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Zigbee controlled light switch with mechanical push buttons - SR-ZS

p.kaczmarek2  0 111 Cool? (0)
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TL;DR

  • SR-ZS is a Zigbee 3.0 light switch with classic mechanical push buttons instead of touch controls, aimed at Home Assistant users.
  • It pairs with Home Assistant as TS0012 and exposes initial state, backlighting, and a "state action" option for automation events.
  • The housing specifies 10 A maximum current and load up to 2 kW for resistive loads, and one unit cost PLN 90.
  • It worked fully satisfactorily with Home Assistant and can be used in automations.
  • The internal design is still partly unclear, including the purpose of the big SOIC chip and the CS100N03 MOSFET, and it costs more than the Wi‑Fi version.
Generated by the language model.

Are you annoyed by the ubiquitous touch buttons? If so, this is the product for you. This light switch offers a combination of Zigbee connectivity with classic, clickable buttons, and what's more, the whole thing can be easily paired with the Home Assistant! The price of the product is unfortunately a little higher than the Wi-Fi version, I paid PLN 90 for this one in our country.

Instructions - the unit is available in two versions, one of which can operate without a neutral wire connection. Interestingly, the recommendations mention Wi-Fi, I guess someone mixed up the protocols.

Designation on the housing: SR-ZS, Zigbee 3.0 protocol, maximum current 10 A, load up to 2 kW (for resistive load).


Pairing with Home Assistant
According to the instructions - you need to press the button longer:

HA detects the switch as TS0012:

The device exposes quite rich settings - we have control over the initial state and even the backlighting.

In addition, we have a "state action" option - for broadcasting events for automation.

JSON view:

The device works fully satisfactorily with HA and can be used in automations.

Interior
The overall design is more built-in than typical Wi-Fi-controlled switches. The front panel is removable.

Executive PCB designation with power supply: SWQ-XH-Z03B REV:2.1 NX 20221219

Switching is realised on relays. The presence of a thermistor and varistor surprised me a bit, as a rule manufacturers omit whatever they can.

There is room in the middle for a third relay. Under the relay is the transistor controlling it, you can see the space saving.
Close-up of a PCB with a relay, capacitors, and brass screw terminals, held in a hand
The fundamental question, however, is what is the CS100N03 MOSFET here for? Presumably for operation in neutral wireless mode.
Datasheet excerpt for CS100N03 B4-1 MOSFET with specs table and TO-252 package diagrams
On the other hand, there is a power supply module with an interesting H1620L chip:
Close-up of a switch interior: green PCB with electrolytic capacitors and black relays, held in a hand
Macro of an SOIC integrated circuit on a green PCB, with soldered pins visible.

Summary
This is the type of switch I like. I find the mechanical buttons more comfortable and pleasant to use, I don't like the tactile ones. Plus here we have control over what we need - you can even configure the backlight. Pairing with the HA is easy too, you can confidently buy.
What's still unclear to me is the design of this switch - I don't fully know what the obscure big chip in the SOIC is, and I haven't looked into the front panel, but I didn't want to damage it. If anyone knows anything more - please let me know, for an addendum.
What light switches do you use in the context of home automation? Wi-Fi, Zigbee, tactile, mechanical?
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p.kaczmarek2
p.kaczmarek2 wrote 14521 posts with rating 12526 , helped 653 times. Been with us since 2014 year.

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