Product Description
Siemens 3RT2028-1AD20 3-pole 38 AMP contactor with a 42v50/60Hz coil and screw terminals. This Sirius series contactor is rated for 10 H.P. @ 230 volt, 25 H.P. @ 460 volt 3 phase, has 1 normally open and 1 normally closed base mounted auxiliary contact and can be mounted on standard 35MM DIN rail. The 3RT2028-1AD20 is a suitable electrical replacement for the now obsolete 3RT1034-1AD20 and will fit wherever it was installed (though any accessories, including auxiliary contacts and overload relays, that were directly mounted would also need to be replaced).
| AMP Rating | 38 AMPS AC-3 / 50 AMPS AC-1 |
| Coil Voltage | 42 volt AC 50/60Hz |
| Poles | 3 |
| Base mounted auxiliaries | 1 N.O. & 1 N.C. |
| Terminals | Screw type |
| Mounting type | DIN Rail or screw mounted |
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Overload Relays |
H.P. ratings comparison
| 3RT1034 | 3RT2028 | ||||||
| Single Phase | Three Phase | Single Phase | Three Phase | ||||
| 115v | 230v | 230v | 460v | 115v | 230v | 230v | 460v |
| 2 | 5 | 10 | 25 | 3 | 5 | 10 | 25 |
DESIGN
The 3RT2028-1AC20 contactor is suitable for use in any climate. They are safe from touch to DIN VDE 0106 Part 100. The 3RT contactors are available screw, spring-type, or ring lug connections. An auxiliary contact is integrated in the basic unit of size S00 contactors. The basic units of sizes S0 to S3 only contain the main conducting paths. All the basic units can be extended with auxiliary switch blocks. Cabinet units with 2 NO + 2 NC (terminal designations acc. to EN 50 012) are available as of size S0; the auxiliary switch block is removable. The size S3 contactors have removable box terminals for the main conductor connections. Ring cable lugs or bars can thus also be connected.
CONTACT RELIABILITY
If voltages ≤ 110 V and currents ≤ 100 mA are to be switched, the auxiliary contacts of 3RT contactors and 3RH contactor relays should be used to ensure good contact stability. These auxiliary contacts are suitable for electronic circuits with currents ≥ 1 mA at a voltageof 17 V.
