Eltako NLZ61NP-UC TDR Flush mount, Recess-mount 230 V

No coil-power loss and heat generation in a switched state through the use of a bi-stable relay. The contact switching takes place to protect the contacts and devices in the zero crossing. The time setting is adjustable from 1 to 12 minutes, the delay from 0 to 12 minutes.

Price: £ 48.99 from Conrad Electronic