Siemens Contactor 3RT1033-1BB40 Frame Size 2 28 amp 3-Pole 24VDC coil Click Here to View information about this Product Click Here for Siemens Overload Relays Overview 3RT10 contactors, 3-pole, sizes S2 to S3 AC and DC operationIEC 60947, EN 60947 (VDE 0660) The 3RT1 contactors are climate-proof. They are finger-safeaccording to EN 50274. Size S00 & Size S0 contactors have an auxiliary contact integrated in thebasic unit. The basic units of sizes S2 to S3 contain only themain current paths. All basic units can be extended with auxiliary switch blocks. Contact reliability If voltages ≤ 110 V and current ≤ 100 mA are to be switched,the auxiliary contacts of the 3RT1 contactor or 3RH11 contactorrelay should be used as they guarantee a high level of contactreliability.These auxiliary contacts are suitable for solid-state circuits withcurrents ≥ 1 mA at a voltage of 17 V. Surge suppression 3RT1 contactors can be retrofitted with RC elements, varistors,diodes or diode assemblies (assembly of diode and Zener diodefor short break times) for damping opening surges in the coil.The surge suppressors are plugged onto the front of size S00contactors. Space is provided for them next to a snap-onauxiliary switch block. For size S0 to S3 contactors, varistors and RC elements can besnapped on either on the top or directly below the coilterminals. Diode assemblies are available in 2 different versionson account of their polarity. Depending on the application theycan be connected either only at the bottom (assembly withmotor starter protector) or only at the top (assembly withoverload relay).The plug-in direction of the diodes and diode assemblies isspecified by coding.
