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CAT # RLM-2 (2 Reviews) Write a Review

$6.00 each
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Product Description
Ideal for use with Arduino and other microcontrollers, this relay module uses data signals to selectively switch two 5V relays, each capable of handling 10A loads. Onboard LED indicators light when a relay is switched. Screw terminals for relay outputs. 0.1" header for voltage and signal input. 50 x 39 x 18mm. 4-relay module also available, CAT# RLM-4.
Spec sheet available in PDF format.
WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to
(This item was manufactured prior to August 31st, 2018)

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Customer Reviews (2 Reviews)

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Connection info... most of it

Reviewer: from PELHAM, AL USA

No doc. comes with it. I got this to work as follows:
5vdc to the Vcc terminal
Gnd to the Gnd terminal (obviously)
Relay is actuated by pulling the in1 or in2 terminal low (to gnd.)
I have not determined what the jumper does, other than to operate as described above the jumper must be Vcc-Vcc.

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Reviewer: from Aztlán

The schematic looks wrong to me. The relay coil works with a direct short across the coil?

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