The 3RH11 control relays are suitable for use in any climate. They are safe from touch to DIN VDE 0106 Part 100. These Siemens relays have screw for easy wire installation. Four contacts are available in the basic unit with options from 2 NO and 2 NC, 3 NO and 1 NC or 4 NO contacts.
The 3RH11 control relays can be expanded by up to four contacts by the addition of mountable auxiliary switch blocks.
The auxiliary switch block can easily be snapped onto the front of the relays. The control relays with 4 contacts in accordance with EN 50 011, with the identification number 40E, can be extended with 80E to 44E auxiliary switch blocks to obtain control relays with 8 contacts in accordance with EN 50 011. The identification numbers 80E to 44E on the auxiliary switch blocks apply to the complete relays.