Auxiliary switch blocks

The miniature contactor relays with four contacts with screw terminals can be expanded by up to four contacts by adding snap-on auxiliary switch blocks, see "Accessories and Spare Parts" > "for 3TF, 3TK, 3TC Contactors and 3TH Contactor Relays and Miniature Contactor Relays" > "Accessories for 3TF, 3TG, 3TK Contactors".

A cover (with unit labeling plate) must be removed from the front of the miniature contactor relays for this purpose. The auxiliary switch block is then easy to mount. The auxiliary switch blocks can be removed again by unlocking them with a laterally arranged slide.

The miniature contactor relays with screw terminals with four contacts according to EN 50011 with the identification number 40E can be expanded with 80E, 71E, 62E, 53E or 44E auxiliary switch blocks to miniature contactor relays with eight contacts according to EN 50011. The identification numbers 80E, 71E, 62E, 53E or 44E on the coded auxiliary switch blocks apply to the complete contactors. They cannot be combined with miniature contactor relays with identification numbers 31E and 33E.

All miniature contactor relays with screw terminals with four contacts according to EN 50011, identification number 40E, 31E or 22E, can be expanded with auxiliary switch blocks with identification number 40, 31, 22, 20, 11 or 02 to miniature contactor relays with six or eight contacts according to EN 50005. The identification numbers on the auxiliary switch blocks apply only to the attached auxiliary switch blocks.

Surge suppression

RC elements, varistors, diodes or diode assemblies (combination of a diode and a Zener diode for short break times) can be plugged onto all contactors and auxiliary switch blocks with screw terminals from the front in order to dampen opening surges in the coil, see "Accessories and Spare Parts" > "for 3TF, 3TK, 3TC Contactors and 3TH Contactor Relays and Miniature Contactor Relays" > "Accessories for 3TF, 3TG, 3TK Contactors".

The unit labeling plate must be removed for this purpose. It can be snapped onto the attached surge suppressor.

Additional load module

The 3TX4490?1J additional load module can be used by programmable logic controllers to increase permissible residual current, and to limit residual voltage in semiconductor outputs, see "Accessories and Spare Parts" > "for 3TF, 3TK, 3TC Contactors and 3TH Contactor Relays and Miniature Contactor Relays" > "Accessories for 3TF, 3TG, 3TK Contactors".

This module ensures the safe shut-down of 3TH2 contactor relays and 3TF2 contactors with direct control via 230 V AC semiconductor outputs. It is accommodated in the same enclosure as the 3TX4490?3. surge suppressors and can be plugged into the contactor.