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We've released the Seeed Relay Selection Guide, it will help you choose the relay that best suits your needs.

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We've Released the Grove Selection Guide and hope to help you find the Grove suit you best. 

This module is a bi-directional SPSD(single-pole, single-throw), normally open solid state relay(SSR). 
The Grove Optocoupler Relay (M281) offers very low on-resistance, which allowing a high load current rating. 
Unlike the other TRIAC SSR in our website, this relay is based on MOSFET, so it can carry both AC load 
and DC load. If you need to use a SSR with the DC load, this is what you want!


  • Low on-resistance(0.5Ω MAX.)
  • 1A continuous load current
  • 60V load voltage rating
  • Low input control current(3mA TYP.)
  • High input-to-output isolation(1.5kV MIN.)
  • Cost-effective: Usually, the price of a single-channel SSR will exceed $10, and the price of this module is less than half.


  • Automated Test Equipment
  • Meter reading systems
  • Medical equipment
  • Battery monitoring
  • Multiplexers



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Grove - Optocoupler Relay (M281)

This is the wiki page for this product, which will show you how to use the product, as well as details about the software and hardware.

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