Pump relay for OpenSprinkler

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It is important that the relay has 1/3 more maximum power than the pump.

Power P = U x I i.e. voltage x current.

A relay with 16A 230V has a maximum power of P=230V x 16A = 3680W

Subtract 1/3 of that: P2 = 3680W x 2 / 3 = 2453,33W = maximum pump power.

The reason for this is the “inductive load”, see also https://www.ralf-jesse.de/index.php/induktive-lasten.html

 

For OpenSprinkler AC and OSPi:

24VAC relay eg from Eltako, Siemens, Finder, ABB and others

for example:

Eltako switching relay, R12-100-24V, AC

 

For OpenSprinkler DC:

Use 3-32VDC semiconductor relays for this. The designation is actually like this, “3-32VDC” or “2-32VDC”

for example:

https://www.reichelt.de/halbleiterrelais-solitron-rj-mini-1polig-20a-230v-rgc1a23d15kke-p133678.html
https://www.reichelt.de/halbleiterrelais-industriegehaeuse-25a-230vac-rm1a23d25-p79464.html

https://www.conrad.de/de/p/kudom-halbleiterrelais-ksi240-d10-lm-last-strom-max-10-a-schaltspannung-max-280-v-ac-nullspannungsschaltend-1-s-507744.html

or with more power:
https://www.conrad.de/de/p/crydom-halbleiterrelais-h12wd4850-last-strom-max-50-a-schaltspannung-max-660-v-ac-nullspannungsschaltend-1-st-187089.html

or for the DIN rail:
https://www.conrad.de/de/p/crydom-halbleiterrelais-ckrd2420-last-strom-max-20-a-schaltspannung-max-280-v-ac-nullspannungsschaltend-1-st-505229.html

For OpenSprinkler We do NOT recommend using Latch!

 

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