ControlByWeb
X-21s Four Relay Form C / SPDT Expansion Module

X-21s expansion module with four relays can be controlled over the internet with an X-400 or X-600M controller.

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Or purchase X-21s from an Authorized Distributor:

UNITED STATES

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ControlByWeb (Buy Direct)

Address: 1681 West 2960 South, Nibley, Utah 84321

Phone: 1-435-750-5999