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Siemens SIRIUS 3RH1 & 3RH2 Series – 4 and 8-Pole Contactor Relays:
The 3RH2 Series Contactor Relays are climate-proof as well as finger-safe, according to IEC 60529. RC elements, varistors, diodes or diode assemblies (combination of a diode and a Zener diode) can be plugged onto all contactor relays for damping opening surges in the coil. The 3RH2 contactor relays are available with screw or spring-type terminals. The basic unit contains four contacts with terminal designations according to EN 50011.
The 3RH21 coupling contactor relays for switching auxiliary circuits are tailored to the special requirements of working with electronic controls. The 3RH21 contactor relays (with the exception of the coupling contactor relays) can be expanded by up to four contacts by the addition of snap-on auxiliary switch blocks. The auxiliary switch block can easily be snapped onto the front of the contactor relays. The auxiliary switch block has a centrally positioned release lever for disassembly. The conventional front auxiliary contacts fulfill the characteristics of positively driven operation and are therefore suitable for safety applications.
NOTE*** The OFF-delay of the NO contact and the ON-delay of the NC contact are increased if the contactor coils are attenuated against voltage peaks (noise suppression diode 6 to 10 times; diode assemblies 2 to 6 times, varistor +2 to 5 ms).